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1582 lines
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HDF5/H5D API Specification
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<!-- HEADER RIGHT " " -->
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<!-- #BeginLibraryItem "/ed_libs/NavBar_RM.lbi" --><hr>
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<center>
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<table border=0 width=98%>
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<tr><td valign=top align=left>
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<a href="index.html">HDF5 documents and links</a> <br>
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<a href="H5.intro.html">Introduction to HDF5</a> <br>
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<a href="http://hdf.ncsa.uiuc.edu/HDF5/doc/UG/index.html">HDF5 User Guide</a> <br>
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<!--
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<a href="Glossary.html">Glossary</a><br>
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-->
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</td>
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<td valign=top align=right>
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And in this document, the
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<a href="RM_H5Front.html">HDF5 Reference Manual</a>
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<br>
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<a href="RM_H5.html">H5</a>
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<a href="RM_H5A.html">H5A</a>
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<a href="RM_H5D.html">H5D</a>
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<a href="RM_H5E.html">H5E</a>
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<a href="RM_H5F.html">H5F</a>
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<a href="RM_H5G.html">H5G</a>
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<a href="RM_H5I.html">H5I</a>
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<a href="RM_H5P.html">H5P</a>
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<br>
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<a href="RM_H5R.html">H5R</a>
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<a href="RM_H5S.html">H5S</a>
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<a href="RM_H5T.html">H5T</a>
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<a href="RM_H5Z.html">H5Z</a>
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<a href="Tools.html">Tools</a>
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<a href="PredefDTypes.html">Datatypes</a>
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</td></tr>
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</table>
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</center>
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<hr>
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<!-- #EndLibraryItem --><center>
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<h1>H5D: Datasets Interface</h1>
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</center>
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<h2>Dataset Object API Functions</h2>
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These functions create and manipulate dataset objects,
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and set and retrieve their constant or persistent properties.
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<p>
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<strong>The C Interfaces:</strong>
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<table border=0>
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<tr><td valign=top>
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<ul>
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<li><a href="#Dataset-Create">H5Dcreate</a>
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<li><a href="#Dataset-Open">H5Dopen</a>
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<li><a href="#Dataset-Close">H5Dclose</a>
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<li><a href="#Dataset-GetSpace">H5Dget_space</a>
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<li><a href="#Dataset-GetSpaceStatus">H5Dget_space_status</a>
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</ul>
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</td><td> </td><td valign=top>
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<ul>
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<li><a href="#Dataset-GetType">H5Dget_type</a>
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<li><a href="#Dataset-GetCreatePlist">H5Dget_create_plist</a>
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<li><a href="#Dataset-GetOffset">H5Dget_offset</a>
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<li><a href="#Dataset-GetStorageSize">H5Dget_storage_size</a>
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<li><a href="#Dataset-VLGetBuf">H5Dvlen_get_buf_size</a>
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<li><a href="#Dataset-VLReclaim">H5Dvlen_reclaim</a>
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</ul>
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</td><td> </td><td valign=top>
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<ul>
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<!--
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<li><a href="#Dataset-Debug">H5Ddebug</a>
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This function is in the distributed source code and is technically
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a public function, but it is NOT intended for public use.
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It is used only by certain tools.
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DO NOT list it in the Reference Manual.
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-->
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<li><a href="#Dataset-Read">H5Dread</a>
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<li><a href="#Dataset-Write">H5Dwrite</a>
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<li><a href="#Dataset-Iterate">H5Diterate</a>
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<li><a href="#Dataset-Extend">H5Dextend</a>
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<li><a href="#Dataset-Fill">H5Dfill</a>
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</ul>
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</td></tr>
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</table>
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<br>
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<i>Alphabetical Listing</i>
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<table border="0">
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<tr>
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<td valign="top">
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<ul>
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<li><a href="#Dataset-Close">H5Dclose</a>
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<li><a href="#Dataset-Create">H5Dcreate</a>
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<li><a href="#Dataset-Extend">H5Dextend</a>
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<li><a href="#Dataset-Fill">H5Dfill</a>
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<li><a href="#Dataset-GetCreatePlist">H5Dget_create_plist</a>
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<li><a href="#Dataset-GetOffset">H5Dget_offset</a>
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</ul>
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</td>
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<td> </td>
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<td valign="top">
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<ul>
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<li><a href="#Dataset-GetSpace">H5Dget_space</a>
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<li><a href="#Dataset-GetSpaceStatus">H5Dget_space_status</a>
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<li><a href="#Dataset-GetStorageSize">H5Dget_storage_size</a>
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<li><a href="#Dataset-GetType">H5Dget_type</a>
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<li><a href="#Dataset-Iterate">H5Diterate</a>
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<li><a href="#Dataset-Open">H5Dopen</a>
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</ul>
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</td>
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<td> </td>
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<td valign="top">
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<ul>
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<li><a href="#Dataset-Read">H5Dread</a>
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<li><a href="#Dataset-VLGetBuf">H5Dvlen_get_buf_size</a>
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<li><a href="#Dataset-VLReclaim">H5Dvlen_reclaim</a>
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<li><a href="#Dataset-Write">H5Dwrite</a>
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</ul>
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</td>
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</tr>
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</table>
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<br>
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<strong>The FORTRAN90 Interfaces:</strong>
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<br>
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In general, each FORTRAN90 subroutine performs exactly the same task
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as the corresponding C function.
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<br>
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<table border=0>
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<tr><td valign=top>
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<ul>
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<li><a href="#Dataset-Create">h5dcreate_f</a>
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<li><a href="#Dataset-Open">h5dopen_f</a>
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<li><a href="#Dataset-Close">h5dclose_f</a>
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<li><a href="#Dataset-GetSpace">h5dget_space_f</a>
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<li><a href="#Dataset-GetSpaceStatus">h5dget_space_status_f</a>
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</ul>
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</td><td> </td><td valign=top>
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<ul>
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<li><a href="#Dataset-GetType">h5dget_type_f</a>
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<li><a href="#Dataset-GetCreatePlist">h5dget_create_plist_f</a>
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<li><a href="#Dataset-GetOffset">h5dget_offset_f</a>
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<li><a href="#Dataset-GetStorageSize">h5dget_storage_size_f</a>
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<li><a href="#Dataset-VLGetBuf">h5dvlen_get_max_len_f</a>
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<!--<li><a href="#Dataset-VLReclaim">h5dvlen_reclaim_f</a> -->
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</ul>
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</td><td> </td><td valign=top>
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<ul>
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<li><a href="#Dataset-Read">h5dread_f</a>
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<li><a href="#Dataset-Write">h5dwrite_f</a>
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<!--<li><a href="#Dataset-Iterate">h5diterate_f</a> -->
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<!--<li><a href="#Dataset-Debug">h5ddebug_f</a> -->
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<li><a href="#Dataset-Extend">h5dextend_f</a>
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<li><a href="#Dataset-Fill">h5dfill_f</a>
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</ul>
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</td></tr>
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</table>
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<!-- NEW PAGE -->
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<!-- NEW PAGE -->
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<!-- HEADER RIGHT "H5Dclose" -->
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataset-Close">H5Dclose</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t </em><code>H5Dclose</code>(<em>hid_t </em><code>dataset_id</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Closes the specified dataset.
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<dt><strong>Description:</strong>
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<dd><code>H5Dclose</code> ends access to a dataset specified by
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<code>dataset_id</code> and releases resources used by it.
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Further use of the dataset identifier is illegal in calls to
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the dataset API.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>hid_t</em> <code>dataset_id</code>
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<dd>IN: Identifier of the dataset to close access to.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a non-negative value if successful;
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otherwise returns a negative value.
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<dt><strong>Fortran90 Interface:</strong> h5dclose_f
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<dd>
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<pre>
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SUBROUTINE h5dclose_f(dset_id, hdferr)
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IMPLICIT NONE
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INTEGER(HID_T), INTENT(IN) :: dset_id ! Dataset identifier
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INTEGER, INTENT(OUT) :: hdferr ! Error code
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! 0 on success and -1 on failure
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END SUBROUTINE h5dclose_f
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</pre>
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<!--<dt><strong>Non-C API(s):</strong>
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<dd>
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<img src="Graphics/Java.gif">
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<img src="Graphics/C++.gif">
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-->
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</dl>
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<!-- NEW PAGE -->
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<!-- HEADER RIGHT "H5Dcreate" -->
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataset-Create">H5Dcreate</a>
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<dt><strong>Signature:</strong>
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<dd><em>hid_t </em><code>H5Dcreate</code>(<em>hid_t </em><code>loc_id</code>,
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<em>const char *</em><code>name</code>,
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<em>hid_t</em> <code>type_id</code>,
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<em>hid_t</em> <code>space_id</code>,
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<em>hid_t</em> <code>create_plist_id</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Creates a dataset at the specified location.
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<dt><strong>Description:</strong>
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<dd><code>H5Dcreate</code> creates a data set with a name,
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<code>name</code>, in the file or in the group specified by
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the identifier <code>loc_id</code>.
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The dataset has the datatype and dataspace identified by
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<code>type_id</code> and <code>space_id</code>, respectively.
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The specified datatype and dataspace are the datatype and
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dataspace of the dataset as it will exist in the file,
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which may be different than in application memory.
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Dataset creation properties are specified by the argument
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<code>create_plist_id</code>.
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<p>
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Dataset names within a group are unique:
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<code>H5Dcreate</code> will return an error if a dataset with
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the name specified in <code>name</code> already exists at the
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location specified in <code>loc_id</code>.
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<p>
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<code>create_plist_id</code> is a <code>H5P_DATASET_CREATE</code>
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property list created with <code>H5Pcreate</code> and
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initialized with the various functions described above.
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<p>
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<code>H5Dcreate</code> returns an error if the dataset's datatype
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includes a variable-length (VL) datatype and the fill value
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is undefined, i.e., set to <code>NULL</code> in the
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dataset creation property list.
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Such a VL datatype may be directly included,
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indirectly included as part of a compound or array datatype, or
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indirectly included as part of a nested compound or array datatype.
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<p>
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<code>H5Dcreate</code> returns a dataset identifier for success
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or a negative value for failure.
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The dataset identifier should eventually be closed by
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calling <code>H5Dclose</code> to release resources it uses.
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<p>
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<strong>Fill values and space allocation:</strong><br>
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The HDF5 library provides flexible means
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of specifying a fill value,
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of specifying when space will be allocated for a dataset, and
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of specifying when fill values will be written to a dataset.
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For further information on these topics, see the document
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<a href="http://hdf.ncsa.uiuc.edu/RFC/Fill_Value/FillValue.html">
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<cite>Fill Value and Dataset Storage Allocation Issues in HDF5</cite></a>
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and the descriptions of the following HDF5 functions in this
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<cite>HDF5 Reference Manual</cite>:
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<table width=80% border="0">
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<tr valign="top" align="left"><td width=10%>
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</td><td width=45%>
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<a href="#Dataset-Fill">H5Dfill</a><br>
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<a href="RM_H5P.html#Property-SetFillValue">H5Pset_fill_value</a><br>
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<a href="RM_H5P.html#Property-GetFillValue">H5Pget_fill_value</a><br>
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<a href="RM_H5P.html#Property-FillValueDefined">H5Pfill_value_defined</a>
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</td><td width=45%>
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<a href="RM_H5P.html#Property-SetFillTime">H5Pset_fill_time</a><br>
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<a href="RM_H5P.html#Property-GetFillTime">H5Pget_fill_time</a><br>
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<a href="RM_H5P.html#Property-SetAllocTime">H5Pset_alloc_time</a><br>
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<a href="RM_H5P.html#Property-GetAllocTime">H5Pget_alloc_time</a>
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</td></tr>
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</table>
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This information is also included in the
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“HDF5 Datasets” chapter of
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the new <cite>HDF5 User's Guide</cite>,
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which is being prepared for release.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>hid_t</em> <code>loc_id</code>
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<dd>IN: Identifier of the file or group
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within which to create the dataset.
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<dt><em>const char *</em> <code>name</code>
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<dd>IN: The name of the dataset to create.
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<dt><em>hid_t</em> <code>type_id</code>
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<dd>IN: Identifier of the datatype to use
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when creating the dataset.
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<dt><em>hid_t</em> <code>space_id</code>
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<dd>IN: Identifier of the dataspace to use
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when creating the dataset.
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<dt><em>hid_t</em> <code>create_plist_id</code>
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<dd>IN: Identifier of the set creation property list.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a dataset identifier if successful;
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otherwise returns a negative value.
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<dt><strong>Fortran90 Interface:</strong> h5dcreate_f
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<dd>
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<pre>
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SUBROUTINE h5dcreate_f(loc_id, name, type_id, space_id, dset_id, &
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hdferr, creation_prp)
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IMPLICIT NONE
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INTEGER(HID_T), INTENT(IN) :: loc_id ! File or group identifier
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CHARACTER(LEN=*), INTENT(IN) :: name ! Name of the dataset
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INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
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INTEGER(HID_T), INTENT(IN) :: space_id ! Dataspace identifier
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INTEGER(HID_T), INTENT(OUT) :: dset_id ! Dataset identifier
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INTEGER, INTENT(OUT) :: hdferr ! Error code
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! 0 on success and -1 on failure
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INTEGER(HID_T), OPTIONAL, INTENT(IN) :: creation_prp
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! Dataset creation propertly
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! list identifier , default
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! value is H5P_DEFAULT_F (6)
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END SUBROUTINE h5dcreate_f
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</pre>
|
|
|
|
<!--<dt><strong>Non-C API(s):</strong>
|
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<dd>
|
|
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
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|
-->
|
|
</dl>
|
|
|
|
<!-- NEW PAGE -->
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|
<!-- HEADER RIGHT "H5Dextend" -->
|
|
<hr>
|
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<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-Extend">H5Dextend</a>
|
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<dt><strong>Signature:</strong>
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<dd><em>herr_t </em><code>H5Dextend</code>(<em>hid_t </em><code>dataset_id</code>,
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<em>const hsize_t *</em> <code>size</code>
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)
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<dt><strong>Purpose:</strong>
|
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<dd>Extends a dataset with unlimited dimension.
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|
<dt><strong>Description:</strong>
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|
<dd><code>H5Dextend</code> verifies that the dataset is at least of size
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<code>size</code>.
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The dimensionality of <code>size</code> is the same as that of
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the dataspace of the dataset being changed.
|
|
This function cannot be applied to a dataset with fixed dimensions.
|
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<p>
|
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Space on disk is immediately allocated for the new dataset extent
|
|
if the dataset's space allocation time is set to
|
|
<code>H5D_ALLOC_TIME_EARLY</code>.
|
|
Fill values will be written to the dataset if the dataset's fill time
|
|
is set to <code>H5D_FILL_TIME_IFSET</code> or
|
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<code>H5D_FILL_TIME_ALLOC</code>.
|
|
(Also see
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|
<a href="RM_H5P.html#Property-SetFillTime">H5Pset_fill_time</a>
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and
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<a href="RM_H5P.html#Property-SetAllocTime">H5Pset_alloc_time</a>.)
|
|
|
|
<dt><strong>Parameters:</strong>
|
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<dl>
|
|
<dt><em>hid_t</em> <code>dataset_id</code>
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<dd>IN: Identifier of the dataset.
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<dt><em>const hsize_t *</em> <code>size</code>
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<dd>IN: Array containing the new magnitude of each dimension.
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</dl>
|
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<dt><strong>Returns:</strong>
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<dd>Returns a non-negative value if successful;
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otherwise returns a negative value.
|
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<dt><strong>Fortran90 Interface:</strong> h5dextend_f
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<dd>
|
|
<pre>
|
|
SUBROUTINE h5dextend_f(dataset_id, size, hdferr)
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IMPLICIT NONE
|
|
INTEGER(HID_T), INTENT(IN) :: dataset_id ! Dataset identifier
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INTEGER(HSIZE_T), DIMENSION(*), INTENT(IN) :: size
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! Array containing
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! dimensions' sizes
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INTEGER, INTENT(OUT) :: hdferr ! Error code
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! 0 on success and -1 on failure
|
|
END SUBROUTINE h5dextend_f
|
|
</pre>
|
|
|
|
<!--<dt><strong>Non-C API(s):</strong>
|
|
<dd>
|
|
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
<!-- NEW PAGE -->
|
|
<!-- HEADER RIGHT "H5Dfill" -->
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-Fill">H5Dfill</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>herr_t </em><code>H5Dfill</code>(
|
|
<em>const void *</em><code>fill</code>,
|
|
<em>hid_t </em><code>fill_type_id</code>,
|
|
<em>void *</em><code>buf</code>,
|
|
<em>hid_t </em><code>buf_type_id</code>,
|
|
<em>hid_t </em><code>space_id</code>
|
|
)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Fills dataspace elements with a fill value in a memory buffer.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dfill</code> explicitly fills
|
|
the dataspace selection in memory, <code>space_id</code>,
|
|
with the fill value specified in <code>fill</code>.
|
|
If <code>fill</code> is <code>NULL</code>,
|
|
a fill value of <code>0</code> (zero) is used.
|
|
<p>
|
|
<code>fill_type_id</code> specifies the datatype
|
|
of the fill value.<br>
|
|
<code>buf</code> specifies the buffer in which
|
|
the dataspace elements will be written.<br>
|
|
<code>buf_type_id</code> specifies the datatype of
|
|
those data elements.
|
|
<p>
|
|
Note that if the fill value datatype differs
|
|
from the memory buffer datatype, the fill value
|
|
will be converted to the memory buffer datatype
|
|
before filling the selection.
|
|
<dt><strong>Note:</strong>
|
|
<dd>Applications sometimes write data only to portions of
|
|
an allocated dataset. It is often useful in such cases
|
|
to fill the unused space with a known
|
|
<span class="termEmphasis">fill value</span>.
|
|
See <a href="RM_H5P.html#Property-SetFillValue">H5Pset_fill_value</a>
|
|
for further discussion.
|
|
Other related functions include
|
|
<a href="RM_H5P.html#Property-GetFillValue">H5Pget_fill_value</a>,
|
|
<a href="RM_H5P.html#Property-FillValueDefined">H5Pfill_value_defined</a>,
|
|
<a href="RM_H5P.html#Property-SetFillTime">H5Pset_fill_time</a>,
|
|
<a href="RM_H5P.html#Property-GetFillTime">H5Pget_fill_time</a>,
|
|
and
|
|
<a href="#Dataset-Create">H5Dcreate</a>.
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>const void *</em><code>fill</code>
|
|
<dd>IN: Pointer to the fill value to be used.
|
|
<dt><em>hid_t </em><code>fill_type_id</code>
|
|
<dd>IN: Fill value datatype identifier.
|
|
<dt><em>void *</em><code>buf</code>
|
|
<dd>IN/OUT: Pointer to the memory buffer containing the
|
|
selection to be filled.
|
|
<dt><em>hid_t </em><code>buf_type_id</code>
|
|
<dd>IN: Datatype of dataspace elements to be filled.
|
|
<dt><em>hid_t </em><code>space_id</code>
|
|
<dd>IN: Dataspace describing memory buffer and
|
|
containing the selection to be filled.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns a non-negative value if successful;
|
|
otherwise returns a negative value.
|
|
<dt><strong>Fortran90 Interface:</strong> h5dfill_f
|
|
<dd>
|
|
<pre>
|
|
SUBROUTINE h5dfill_f(fill_value, space_id, buf, hdferr)
|
|
IMPLICIT NONE
|
|
TYPE, INTENET(IN) :: fill_value ! Fill value; may be have one of the
|
|
! following types:
|
|
! INTEGER, REAL, DOUBLE PRECISION,
|
|
! CHARACTER
|
|
INTEGER(HID_T), INTENT(IN) :: space_id ! Memory dataspace selection identifier
|
|
TYPE, DIMENSION(*) :: buf ! Memory buffer to fill in; must have
|
|
! the same datatype as fill value
|
|
INTEGER, INTENT(OUT) :: hdferr ! Error code
|
|
! 0 on success and -1 on failure
|
|
END SUBROUTINE h5dfill_f
|
|
</pre>
|
|
|
|
<!--<dt><strong>Non-C API(s):</strong>
|
|
<dd>
|
|
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
<!-- NEW PAGE -->
|
|
<!-- HEADER RIGHT "H5Dget_create_plist" -->
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-GetCreatePlist">H5Dget_create_plist</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>hid_t </em><code>H5Dget_create_plist</code>(<em>hid_t </em><code>dataset_id</code>
|
|
)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Returns an identifier for a copy of the
|
|
dataset creation property list for a dataset.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dget_create_plist</code> returns an identifier for a
|
|
copy of the dataset creation property list for a dataset.
|
|
The creation property list identifier should be released with
|
|
the <code>H5Pclose</code> function.
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>hid_t</em> <code>dataset_id</code>
|
|
<dd>IN: Identifier of the dataset to query.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns a dataset creation property list identifier if successful;
|
|
otherwise returns a negative value.
|
|
<dt><strong>Fortran90 Interface:</strong> h5dget_create_plist_f
|
|
<dd>
|
|
<pre>
|
|
SUBROUTINE h5dget_create_plist_f(dataset_id, creation_prp, hdferr)
|
|
IMPLICIT NONE
|
|
INTEGER(HID_T), INTENT(IN) :: dataset_id ! Dataset identifier
|
|
INTEGER(HID_T), INTENT(OUT) :: creation_id ! Dataset creation
|
|
! property list identifier
|
|
INTEGER, INTENT(OUT) :: hdferr ! Error code
|
|
! 0 on success and -1 on failure
|
|
END SUBROUTINE h5dget_create_plist_f
|
|
|
|
</pre>
|
|
|
|
<!--<dt><strong>Non-C API(s):</strong>
|
|
<dd>
|
|
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
<!-- NEW PAGE -->
|
|
<!-- HEADER RIGHT "H5Dget_offset" -->
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-GetOffset">H5Dget_offset</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>haddr_t </em><code>H5Dget_offset</code>(<em>hid_t </em><code>dset_id</code>)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Returns dataset address in file.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dget_offset</code> returns the address in the file
|
|
of the dataset <code>dset_id</code>.
|
|
That address is expressed as the offset in bytes from
|
|
the beginning of the file.
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>hid_t </em><code>dset_id</code>
|
|
<dd>Dataset identifier.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns the offset in bytes;
|
|
otherwise returns <code>HADDR_UNDEF</code>, a negative value.
|
|
<dt><strong>Fortran90 Interface:</strong>
|
|
<dd>None.
|
|
<!--
|
|
<pre>
|
|
SUBROUTINE
|
|
</pre>
|
|
-->
|
|
|
|
<!--<dt><strong>Non-C API(s):</strong>
|
|
<dd>
|
|
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
<!-- NEW PAGE -->
|
|
<!-- HEADER RIGHT "H5Dget_space" -->
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-GetSpace">H5Dget_space</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>hid_t </em><code>H5Dget_space</code>(<em>hid_t </em><code>dataset_id</code>
|
|
)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Returns an identifier for a copy of the dataspace for a dataset.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dget_space</code> returns an identifier for a copy of the
|
|
dataspace for a dataset.
|
|
The dataspace identifier should be released with the
|
|
<code>H5Sclose</code> function.
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>hid_t</em> <code>dataset_id</code>
|
|
<dd>IN: Identifier of the dataset to query.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns a dataspace identifier if successful;
|
|
otherwise returns a negative value.
|
|
<dt><strong>Fortran90 Interface:</strong> h5dget_space_f
|
|
<dd>
|
|
<pre>
|
|
SUBROUTINE h5dget_space_f(dataset_id, dataspace_id, hdferr)
|
|
IMPLICIT NONE
|
|
INTEGER(HID_T), INTENT(IN) :: dataset_id ! Dataset identifier
|
|
INTEGER(HID_T), INTENT(OUT) :: dataspace_id ! Dataspace identifier
|
|
INTEGER, INTENT(OUT) :: hdferr ! Error code
|
|
! 0 on success and -1 on failure
|
|
END SUBROUTINE h5dget_space_f
|
|
</pre>
|
|
|
|
<!--<dt><strong>Non-C API(s):</strong>
|
|
<dd>
|
|
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
<!-- NEW PAGE -->
|
|
<!-- HEADER RIGHT "H5Dget_space_status" -->
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-GetSpaceStatus">H5Dget_space_status</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>herr_t</em> <code>H5Dget_space_status</code>(<em>hid_t </em><code>dset_id</code>,
|
|
<em>H5D_space_status_t *</em><code>status</code>)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Determines whether space has been allocated for a dataset.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dget_space_status</code> determines whether space has been
|
|
allocated for the dataset <code>dset_id</code>.
|
|
<p>
|
|
Space allocation status is returned in <code>status</code>,
|
|
which will have one of the following values:
|
|
<center>
|
|
<table border="0">
|
|
<tr valign="top"><td rowspan="3"> </td><td>
|
|
H5D_SPACE_STATUS_NOT_ALLOCATED
|
|
</td><td>
|
|
Space has not been allocated for this dataset.
|
|
</td></tr><tr valign="top"><td>
|
|
H5D_SPACE_STATUS_ALLOCATED
|
|
</td><td>
|
|
Space has been allocated for this dataset.
|
|
</td></tr><tr valign="top"><td>
|
|
H5D_SPACE_STATUS_PART_ALLOCATED
|
|
</td><td>
|
|
Space has been partially allocated for this dataset.
|
|
(Used only for datasets with chunked storage.)
|
|
</td></tr>
|
|
</table>
|
|
</center>
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>hid_t</em> <code>dset_id</code>
|
|
<dd>IN: Identifier of the dataset to query.
|
|
<dt><em>H5D_space_status_t *</em><code>status</code>
|
|
<dd>OUT: Space allocation status.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns a non-negative value if successful;
|
|
otherwise returns a negative value.
|
|
<dt><strong>Fortran90 Interface:</strong> h5dget_space_status_f
|
|
<dd>
|
|
<pre>
|
|
SUBROUTINE h5dget_space_status_f(dset_id, flag, hdferr)
|
|
IMPLICIT NONE
|
|
INTEGER(HID_T), INTENT(IN) :: dset_id ! Dataset identifier
|
|
INTEGER, INTENET(OUT) :: flag ! Status flag ; possible values:
|
|
! H5D_SPACE_STS_ERROR_F
|
|
! H5D_SPACE_STS_NOT_ALLOCATED_F
|
|
! H5D_SPACE_STS_PART_ALLOCATED_F
|
|
! H5D_SPACE_STS_ALLOCATED_F
|
|
INTEGER, INTENT(OUT) :: hdferr ! Error code
|
|
! 0 on success and -1 on failure
|
|
END SUBROUTINE h5dget_space_status_f
|
|
</pre>
|
|
|
|
<!--<dt><strong>Non-C API(s):</strong>
|
|
<dd>
|
|
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
<!-- NEW PAGE -->
|
|
<!-- HEADER RIGHT "H5Dget_storage_size" -->
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-GetStorageSize">H5Dget_storage_size</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>hsize_t </em><code>H5Dget_storage_size</code>(<em>hid_t </em><code>dataset_id</code>
|
|
)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Returns the amount of storage required for a dataset.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dget_storage_size</code> returns the amount of storage
|
|
that is required for the specified dataset, <code>dataset_id</code>.
|
|
For chunked datasets, this is the number of allocated chunks times
|
|
the chunk size.
|
|
The return value may be zero if no data has been stored.
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>hid_t</em> <code>dataset_id</code>
|
|
<dd>IN: Identifier of the dataset to query.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns the amount of storage space allocated for the dataset,
|
|
not counting meta data;
|
|
otherwise returns 0 (zero).
|
|
<dt><strong>Fortran90 Interface:</strong> h5dget_storage_size_f
|
|
<dd>
|
|
<pre>
|
|
SUBROUTINE h5dget_storage_size_f(dset_id, size, hdferr)
|
|
IMPLICIT NONE
|
|
INTEGER(HID_T), INTENT(IN) :: dset_id ! Dataset identifier
|
|
INTEGER(HSIZE_T), INTENT(OUT) :: size ! Amount of storage required
|
|
! for dataset
|
|
INTEGER, INTENT(OUT) :: hdferr ! Error code
|
|
! 0 on success and -1 on failure
|
|
END SUBROUTINE h5dget_storage_size_f
|
|
</pre>
|
|
|
|
<!--<dt><strong>Non-C API(s):</strong>
|
|
<dd>
|
|
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
<!-- NEW PAGE -->
|
|
<!-- HEADER RIGHT "H5Dget_type" -->
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-GetType">H5Dget_type</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>hid_t </em><code>H5Dget_type</code>(<em>hid_t </em><code>dataset_id</code>
|
|
)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Returns an identifier for a copy of the datatype for a dataset.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dget_type</code> returns an identifier for a copy of the
|
|
datatype for a dataset.
|
|
The datatype should be released with the <code>H5Tclose</code> function.
|
|
<p>
|
|
If a dataset has a named datatype, then an identifier to the
|
|
opened datatype is returned.
|
|
Otherwise, the returned datatype is read-only.
|
|
If atomization of the datatype fails, then the datatype is closed.
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>hid_t</em> <code>dataset_id</code>
|
|
<dd>IN: Identifier of the dataset to query.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns a datatype identifier if successful;
|
|
otherwise returns a negative value.
|
|
<dt><strong>Fortran90 Interface:</strong> h5dget_type_f
|
|
<dd>
|
|
<pre>
|
|
SUBROUTINE h5dget_type_f(dataset_id, datatype_id, hdferr)
|
|
IMPLICIT NONE
|
|
INTEGER(HID_T), INTENT(IN) :: dataset_id ! Dataset identifier
|
|
INTEGER(HID_T), INTENT(OUT) :: datatype_id ! Datatype identifier
|
|
INTEGER, INTENT(OUT) :: hdferr ! Error code
|
|
! 0 on success and -1 on failure
|
|
END SUBROUTINE h5dget_type_f
|
|
</pre>
|
|
|
|
<!--<dt><strong>Non-C API(s):</strong>
|
|
<dd>
|
|
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
<!-- NEW PAGE -->
|
|
<!-- HEADER RIGHT "H5Diterate" -->
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-Iterate">H5Diterate</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>herr_t </em><code>H5Diterate</code>(
|
|
<em>void *</em><code>buf</code>,
|
|
<em>hid_t </em><code>type_id</code>,
|
|
<em>hid_t </em><code>space_id</code>,
|
|
<em>H5D_operator_t </em><code>operator</code>,
|
|
<em>void *</em><code>operator_data</code>
|
|
)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Iterates over all selected elements in a dataspace.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Diterate</code> iterates over all the elements selected
|
|
in a memory buffer. The callback function is called once for each
|
|
element selected in the dataspace.
|
|
<p>
|
|
The selection in the dataspace is modified so that any elements
|
|
already iterated over are removed from the selection if the
|
|
iteration is interrupted (by the <code>H5D_operator_t</code>
|
|
function returning non-zero) before the iteration is complete;
|
|
the iteration may then be re-started by the user where it left off.
|
|
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>void *</em><code>buf</code>
|
|
<dd>IN/OUT: Pointer to the buffer in memory containing the
|
|
elements to iterate over.
|
|
<dt><em>hid_t </em><code>type_id</code>
|
|
<dd>IN: Datatype identifier for the elements stored in
|
|
<code>buf</code>.
|
|
<dt><em>hid_t </em><code>space_id</code>
|
|
<dd>IN: Dataspace identifier for <code>buf</code>.
|
|
Also contains the selection to iterate over.
|
|
<dt><em>H5D_operator_t </em><code>operator</code>
|
|
<dd>IN: Function pointer to the routine to be called
|
|
for each element in <code>buf</code> iterated over.
|
|
<dt><em>void *</em><code>operator_data</code>
|
|
<dd>IN/OUT: Pointer to any user-defined data associated
|
|
with the operation.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns the return value of the last operator if it was non-zero,
|
|
or zero if all elements have been processed.
|
|
Otherwise returns a negative value.
|
|
<dt><strong>Fortran90 Interface:</strong>
|
|
<dd>None.
|
|
<!--
|
|
<pre>
|
|
SUBROUTINE
|
|
</pre>
|
|
-->
|
|
|
|
<!--<dt><strong>Non-C API(s):</strong>
|
|
<dd>
|
|
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
<!-- NEW PAGE -->
|
|
<!-- HEADER RIGHT "H5Dopen" -->
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-Open">H5Dopen</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>hid_t </em><code>H5Dopen</code>(<em>hid_t </em><code>loc_id</code>,
|
|
<em>const char *</em><code>name</code>
|
|
)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Opens an existing dataset.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dopen</code> opens an existing dataset for access in the file
|
|
or group specified in <code>loc_id</code>. <code>name</code> is
|
|
a dataset name and is used to identify the dataset in the file.
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>hid_t</em> <code>loc_id</code>
|
|
<dd>IN: Identifier of the file or group
|
|
within which the dataset to be accessed will be found.
|
|
<dt><em>const char *</em> <code>name</code>
|
|
<dd>IN: The name of the dataset to access.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns a dataset identifier if successful;
|
|
otherwise returns a negative value.
|
|
<dt><strong>Fortran90 Interface:</strong> h5dopen_f
|
|
<dd>
|
|
<pre>
|
|
SUBROUTINE h5dopen_f(loc_id, name, dset_id, hdferr)
|
|
IMPLICIT NONE
|
|
INTEGER(HID_T), INTENT(IN) :: loc_id ! File or group identifier
|
|
CHARACTER(LEN=*), INTENT(IN) :: name ! Name of the dataset
|
|
INTEGER(HID_T), INTENT(OUT) :: dset_id ! Dataset identifier
|
|
INTEGER, INTENT(OUT) :: hdferr ! Error code
|
|
! 0 on success and -1 on failure
|
|
END SUBROUTINE h5dopen_f
|
|
</pre>
|
|
|
|
<!--<dt><strong>Non-C API(s):</strong>
|
|
<dd>
|
|
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
<!-- NEW PAGE -->
|
|
<!-- HEADER RIGHT "H5Dread" -->
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-Read">H5Dread</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>herr_t </em><code>H5Dread</code>(<em>hid_t </em><code>dataset_id</code>,
|
|
<em>hid_t</em> <code>mem_type_id</code>,
|
|
<em>hid_t</em> <code>mem_space_id</code>,
|
|
<em>hid_t</em> <code>file_space_id</code>,
|
|
<em>hid_t</em> <code>xfer_plist_id</code>,
|
|
<em>void *</em> <code>buf</code>
|
|
)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Reads raw data from a dataset into a buffer.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dread</code> reads a (partial) dataset, specified by its
|
|
identifier <code>dataset_id</code>, from the
|
|
file into an application memory buffer <code>buf</code>.
|
|
Data transfer properties are defined by the argument
|
|
<code>xfer_plist_id</code>.
|
|
The memory datatype of the (partial) dataset is identified by
|
|
the identifier <code>mem_type_id</code>.
|
|
The part of the dataset to read is defined by
|
|
<code>mem_space_id</code> and <code>file_space_id</code>.
|
|
<p>
|
|
<code>file_space_id</code> is used to specify only the selection within
|
|
the file dataset's dataspace. Any dataspace specified in <code>file_space_id</code>
|
|
is ignored by the library and the dataset's dataspace is always used.
|
|
<code>file_space_id</code> can be the constant <code>H5S_ALL</code>.
|
|
which indicates that the entire file dataspace, as defined by the
|
|
current dimensions of the dataset, is to be selected.
|
|
<p>
|
|
<code>mem_space_id</code> is used to specify both the memory dataspace
|
|
and the selection within that dataspace.
|
|
<code>mem_space_id</code> can be the constant <code>H5S_ALL</code>,
|
|
in which case the file dataspace is used for the memory dataspace and
|
|
the selection defined with <code>file_space_id</code> is used for the
|
|
selection within that dataspace.
|
|
<p>
|
|
If raw data storage space has not been allocated for the dataset
|
|
and a fill value has been defined, the returned buffer <code>buf</code>
|
|
is filled with the fill value.
|
|
<p>
|
|
The behavior of the library for the various combinations of valid
|
|
dataspace identifiers and H5S_ALL for the <code>mem_space_id</code> and the
|
|
<code>file_space_id</code> parameters is described below:
|
|
|
|
<br><br>
|
|
<table border=0>
|
|
<tr>
|
|
<th>
|
|
<code>mem_space_id </code>
|
|
</th>
|
|
<th>
|
|
<code>file_space_id </code>
|
|
</th>
|
|
<th>
|
|
Behavior
|
|
</th>
|
|
</tr>
|
|
|
|
<tr valign="top">
|
|
<td>
|
|
valid dataspace identifier
|
|
</td>
|
|
<td>
|
|
valid dataspace identifier
|
|
</td>
|
|
<td>
|
|
<code>mem_space_id</code> specifies the memory dataspace and the
|
|
selection within it.
|
|
<code>file_space_id</code> specifies the selection within the file
|
|
dataset's dataspace.
|
|
</td>
|
|
</tr>
|
|
|
|
<tr valign="top">
|
|
<td>
|
|
<code>H5S_ALL</code>
|
|
</td>
|
|
<td>
|
|
valid dataspace identifier
|
|
</td>
|
|
<td>
|
|
The file dataset's dataspace is used for the memory dataspace and the
|
|
selection specified with <code>file_space_id</code> specifies the
|
|
selection within it.
|
|
The combination of the file dataset's dataspace and the selection from
|
|
<code>file_space_id</code> is used for memory also.
|
|
</td>
|
|
</tr>
|
|
|
|
<tr valign="top">
|
|
<td>
|
|
valid dataspace identifier
|
|
</td>
|
|
<td>
|
|
<code>H5S_ALL</code>
|
|
</td>
|
|
<td>
|
|
<code>mem_space_id</code> specifies the memory dataspace and the
|
|
selection within it.
|
|
The selection within the file dataset's dataspace is set to the "all"
|
|
selection.
|
|
</td>
|
|
</tr>
|
|
|
|
<tr valign="top">
|
|
<td>
|
|
<code>H5S_ALL</code>
|
|
</td>
|
|
<td>
|
|
<code>H5S_ALL</code>
|
|
</td>
|
|
<td>
|
|
The file dataset's dataspace is used for the memory dataspace and the
|
|
selection within the memory dataspace is set to the "all" selection.
|
|
The selection within the file dataset's dataspace is set to the "all"
|
|
selection.
|
|
</td>
|
|
</tr>
|
|
|
|
</table>
|
|
|
|
<p>
|
|
Setting an <code>H5S_ALL</code> selection indicates that the entire dataspace, as
|
|
defined by the current dimensions of a dataspace, will be selected.
|
|
The number of elements selected in the memory dataspace must match the
|
|
number of elements selected in the file dataspace.
|
|
<p>
|
|
<code>xfer_plist_id</code> can be the constant <code>H5P_DEFAULT</code>.
|
|
in which case the default data transfer properties are used.
|
|
<p>
|
|
Data is automatically converted from the file datatype
|
|
and dataspace to the memory datatype and dataspace
|
|
at the time of the read. See the
|
|
<a href="Datatypes.html#Datatypes-DataConversion">Data Conversion</a>
|
|
section of <cite>The Data Type Interface (H5T)</cite> in the
|
|
<cite>HDF5 User's Guide</cite> for a discussion of
|
|
data conversion, including the range of conversions currently
|
|
supported by the HDF5 libraries.
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>hid_t</em> <code>dataset_id</code>
|
|
<dd>IN: Identifier of the dataset read from.
|
|
<dt><em>hid_t</em> <code>mem_type_id</code>
|
|
<dd>IN: Identifier of the memory datatype.
|
|
<dt><em>hid_t</em> <code>mem_space_id</code>
|
|
<dd>IN: Identifier of the memory dataspace.
|
|
<dt><em>hid_t</em> <code>file_space_id</code>
|
|
<dd>IN: Identifier of the dataset's dataspace in the file.
|
|
<dt><em>hid_t</em> <code>xfer_plist_id</code>
|
|
<dd>IN: Identifier of a transfer property list
|
|
for this I/O operation.
|
|
<dt><em>void *</em> <code>buf</code>
|
|
<dd>OUT: Buffer to receive data read from file.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns a non-negative value if successful;
|
|
otherwise returns a negative value.
|
|
<dt><strong>Fortran90 Interface:</strong> h5dread_f
|
|
|
|
<dd>There are seperate versions of this interface.
|
|
Their use depends on the datatype of the object being read.
|
|
|
|
<p>Use the following <code>h5dread_f</code> call for
|
|
all datatypes except object and dataset region references:
|
|
|
|
<dd>
|
|
<pre>
|
|
SUBROUTINE h5dread_f(dset_id, mem_type_id, buf, dims, hdferr, &
|
|
mem_space_id, file_space_id, xfer_prp)
|
|
|
|
IMPLICIT NONE
|
|
INTEGER(HID_T), INTENT(IN) :: dset_id ! Dataset identifier
|
|
INTEGER(HID_T), INTENT(IN) :: mem_type_id ! Memory datatype identifier
|
|
TYPE, INTENT(INOUT) :: buf ! Data buffer; may be a scalar
|
|
! or an array
|
|
DIMENSION(*), INTEGER(HSIZE_T), INTENT(IN) :: dims
|
|
! Array to hold corresponding
|
|
! dimension sizes of data
|
|
! buffer buf
|
|
! dim(k) has value of the k-th
|
|
! dimension of buffer buf
|
|
! Values are ignored if buf is
|
|
! a scalar
|
|
INTEGER, INTENT(OUT) :: hdferr ! Error code
|
|
! 0 on success and -1 on failure
|
|
INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
|
|
! Memory dataspace identfier
|
|
! Default value is H5S_ALL_F
|
|
INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
|
|
! File dataspace identfier
|
|
! Default value is H5S_ALL_F
|
|
INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp
|
|
! Transfer property list identifier
|
|
! Default value is H5P_DEFAULT_F
|
|
END SUBROUTINE h5dread_f
|
|
</pre>
|
|
|
|
<p>Use this <code>h5dread_f</code> call for
|
|
object reference and dataset region reference datatypes:
|
|
|
|
<pre>
|
|
SUBROUTINE h5dread_f(dset_id, mem_type_id, buf, n, hdferr, &
|
|
mem_space_id, file_space_id, xfer_prp)
|
|
|
|
IMPLICIT NONE
|
|
INTEGER(HID_T), INTENT(IN) :: dset_id ! Dataset identifier
|
|
INTEGER(HID_T), INTENT(IN) :: mem_type_id ! Memory datatype identifier
|
|
DIMENSION(*), INTEGER(HSIZE_T), INTENT(IN) :: dims
|
|
! Array to hold corresponding
|
|
! dimension sizes of data
|
|
! buffer buf
|
|
! dim(k) has value of the k-th
|
|
! dimension of buffer buf
|
|
! Values are ignored if buf
|
|
! is a scalar
|
|
TYPE(hobj_ref_t_f), DIMENSION(dims(1)), INTENT(INOUT) :: buf
|
|
! Data buffer of rank 1
|
|
INTEGER, INTENT(OUT) :: hdferr ! Error code
|
|
! 0 on success and -1 on failure
|
|
INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
|
|
! Memory dataspace identfier
|
|
! Default value is H5S_ALL_F
|
|
INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
|
|
! File dataspace identfier
|
|
! Default value is H5S_ALL_F
|
|
INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp
|
|
! Transfer property list identifier
|
|
! Default value is H5P_DEFAULT_F
|
|
END SUBROUTINE h5dread_f
|
|
</pre>
|
|
|
|
<!--<dt><strong>Non-C API(s):</strong>
|
|
<dd>
|
|
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
<!-- NEW PAGE -->
|
|
<!-- HEADER RIGHT "H5Dvlen_get_buf_size" -->
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-VLGetBuf">H5Dvlen_get_buf_size</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>herr_t </em><code>H5Dvlen_get_buf_size</code>(<em>hid_t </em><code>dataset_id</code>,
|
|
<em>hid_t</em> <code>type_id</code>,
|
|
<em>hid_t</em> <code>space_id</code>,
|
|
<em>hsize_t</em> *<code>size</code>
|
|
)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Determines the number of bytes required to store VL data.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dvlen_get_buf_size</code> determines the number of bytes
|
|
required to store the VL data from the dataset, using the
|
|
<code>space_id</code> for the selection in the dataset on
|
|
disk and the <code>type_id</code> for the memory representation
|
|
of the VL data in memory.
|
|
<p>
|
|
<code>*size</code> is returned with the number of bytes
|
|
required to store the VL data in memory.
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>hid_t</em> <code>dataset_id</code>
|
|
<dd>IN: Identifier of the dataset to query.
|
|
<dt><em>hid_t</em> <code>type_id</code>
|
|
<dd>IN: Datatype identifier.
|
|
<dt><em>hid_t</em> <code>space_id</code>
|
|
<dd>IN: Dataspace identifier.
|
|
<dt><em>hsize_t</em> *<code>size</code>
|
|
<dd>OUT: The size in bytes of the memory buffer required to store the VL data.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns non-negative value if successful;
|
|
otherwise returns a negative value.
|
|
<dt><strong>Fortran90 Interface:</strong> h5dvlen_get_max_len_f
|
|
<dd>There is no direct FORTRAN couterpart for the C function
|
|
<code>H5Dvlen_get_buf_size</code>;
|
|
corresponding functionality is provided by the FORTRAN function
|
|
<code>h5dvlen_get_max_len_f</code></a>.
|
|
<br>
|
|
<pre>
|
|
SUBROUTINE h5dvlen_get_max_len_f(dset_id, size, hdferr)
|
|
IMPLICIT NONE
|
|
INTEGER(HID_T), INTENT(IN) :: dset_id ! Dataset identifier
|
|
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
|
|
INTEGER(HID_T), INTENT(IN) :: space_id ! Dataspace identifier
|
|
|
|
INTEGER(SIZE_T), INTENT(OUT) :: elem_len ! Maximum length of the element
|
|
INTEGER, INTENT(OUT) :: hdferr ! Error code
|
|
! 0 on success and -1 on failure
|
|
END SUBROUTINE h5dvlen_get_max_len_f
|
|
</pre>
|
|
|
|
<!--
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
<!-- NEW PAGE -->
|
|
<!-- HEADER RIGHT "H5Dvlen_reclaim" -->
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-VLReclaim">H5Dvlen_reclaim</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>herr_t </em><code>H5Dvlen_reclaim</code>(<em>hid_t </em><code>type_id</code>,
|
|
<em>hid_t</em> <code>space_id</code>,
|
|
<em>hid_t</em> <code>plist_id</code>,
|
|
<em>void</em> *<code>buf</code>
|
|
)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Reclaims VL datatype memory buffers.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dvlen_reclaim</code> reclaims memory buffers created to
|
|
store VL datatypes.
|
|
<p>
|
|
The <code>type_id</code> must be the datatype stored in the buffer.
|
|
The <code>space_id</code> describes the selection for the memory buffer
|
|
to free the VL datatypes within.
|
|
The <code>plist_id</code> is the dataset transfer property list which
|
|
was used for the I/O transfer to create the buffer.
|
|
And <code>buf</code> is the pointer to the buffer to be reclaimed.
|
|
<p>
|
|
The VL structures (<code>hvl_t</code>) in the user's buffer are
|
|
modified to zero out the VL information after the memory has been reclaimed.
|
|
<p>
|
|
If nested VL datatypes were used to create the buffer,
|
|
this routine frees them <em>from the bottom up</em>, releasing all
|
|
the memory without creating memory leaks.
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>hid_t</em> <code>type_id</code>
|
|
<dd>IN: Identifier of the datatype.
|
|
<dt><em>hid_t</em> <code>space_id</code>
|
|
<dd>IN: Identifier of the dataspace.
|
|
<dt><em>hid_t</em> <code>plist_id</code>
|
|
<dd>IN: Identifier of the property list used to create the buffer.
|
|
<dt><em>void</em> *<code>buf</code>
|
|
<dd>IN: Pointer to the buffer to be reclaimed.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns non-negative value if successful;
|
|
otherwise returns a negative value.
|
|
<dt><strong>Fortran90 Interface:</strong>
|
|
<dd>None.
|
|
<!--
|
|
<pre>
|
|
SUBROUTINE
|
|
</pre>
|
|
-->
|
|
|
|
<!--<dt><strong>Non-C API(s):</strong>
|
|
<dd>
|
|
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
<!-- NEW PAGE -->
|
|
<!-- HEADER RIGHT "H5Dwrite" -->
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-Write">H5Dwrite</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>herr_t </em><code>H5Dwrite</code>(<em>hid_t </em><code>dataset_id</code>,
|
|
<em>hid_t</em> <code>mem_type_id</code>,
|
|
<em>hid_t</em> <code>mem_space_id</code>,
|
|
<em>hid_t</em> <code>file_space_id</code>,
|
|
<em>hid_t</em> <code>xfer_plist_id</code>,
|
|
<em>const void *</em> <code>buf</code>
|
|
)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Writes raw data from a buffer to a dataset.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dwrite</code> writes a (partial) dataset, specified by its
|
|
identifier <code>dataset_id</code>, from the
|
|
application memory buffer <code>buf</code> into the file.
|
|
Data transfer properties are defined by the argument
|
|
<code>xfer_plist_id</code>.
|
|
The memory datatype of the (partial) dataset is identified by
|
|
the identifier <code>mem_type_id</code>.
|
|
The part of the dataset to write is defined by
|
|
<code>mem_space_id</code> and <code>file_space_id</code>.
|
|
<p>
|
|
<code>file_space_id</code> is used to specify only the selection within
|
|
the file dataset's dataspace. Any dataspace specified in <code>file_space_id</code>
|
|
is ignored by the library and the dataset's dataspace is always used.
|
|
<code>file_space_id</code> can be the constant <code>H5S_ALL</code>.
|
|
which indicates that the entire file dataspace, as defined by the
|
|
current dimensions of the dataset, is to be selected.
|
|
<p>
|
|
<code>mem_space_id</code> is used to specify both the memory dataspace
|
|
and the selection within that dataspace.
|
|
<code>mem_space_id</code> can be the constant <code>H5S_ALL</code>,
|
|
in which case the file dataspace is used for the memory dataspace and
|
|
the selection defined with <code>file_space_id</code> is used for the
|
|
selection within that dataspace.
|
|
<p>
|
|
The behavior of the library for the various combinations of valid
|
|
dataspace IDs and H5S_ALL for the <code>mem_space_id</code> and the
|
|
<code>file_space_id</code> parameters is described below:
|
|
|
|
<br><br>
|
|
<table border=0>
|
|
<tr>
|
|
<th>
|
|
<code>mem_space_id </code>
|
|
</th>
|
|
<th>
|
|
<code>file_space_id </code>
|
|
</th>
|
|
<th>
|
|
Behavior
|
|
</th>
|
|
</tr>
|
|
|
|
<tr valign="top">
|
|
<td>
|
|
valid dataspace identifier
|
|
</td>
|
|
<td>
|
|
valid dataspace identifier
|
|
</td>
|
|
<td>
|
|
<code>mem_space_id</code> specifies the memory dataspace and the
|
|
selection within it.
|
|
<code>file_space_id</code> specifies the selection within the file
|
|
dataset's dataspace.
|
|
</td>
|
|
</tr>
|
|
|
|
<tr valign="top">
|
|
<td>
|
|
H5S_ALL
|
|
</td>
|
|
<td>
|
|
valid dataspace identifier
|
|
</td>
|
|
<td>
|
|
The file dataset's dataspace is used for the memory dataspace and the
|
|
selection specified with <code>file_space_id</code> specifies the
|
|
selection within it.
|
|
The combination of the file dataset's dataspace and the selection from
|
|
<code>file_space_id</code> is used for memory also.
|
|
</td>
|
|
</tr>
|
|
|
|
<tr valign="top">
|
|
<td>
|
|
valid dataspace identifier
|
|
</td>
|
|
<td>
|
|
H5S_ALL
|
|
</td>
|
|
<td>
|
|
<code>mem_space_id</code> specifies the memory dataspace and the
|
|
selection within it.
|
|
The selection within the file dataset's dataspace is set to the "all"
|
|
selection.
|
|
</td>
|
|
</tr>
|
|
|
|
<tr valign="top">
|
|
<td>
|
|
H5S_ALL
|
|
</td>
|
|
<td>
|
|
H5S_ALL
|
|
</td>
|
|
<td>
|
|
The file dataset's dataspace is used for the memory dataspace and the
|
|
selection within the memory dataspace is set to the "all" selection.
|
|
The selection within the file dataset's dataspace is set to the "all"
|
|
selection.
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<p>
|
|
Setting an "all" selection indicates that the entire dataspace, as
|
|
defined by the current dimensions of a dataspace, will be selected.
|
|
The number of elements selected in the memory dataspace must match the
|
|
number of elements selected in the file dataspace.
|
|
<p>
|
|
<code>xfer_plist_id</code> can be the constant <code>H5P_DEFAULT</code>.
|
|
in which case the default data transfer properties are used.
|
|
<p>
|
|
Writing to an dataset will fail if the HDF5 file was
|
|
not opened with write access permissions.
|
|
<p>
|
|
Data is automatically converted from the memory datatype
|
|
and dataspace to the file datatype and dataspace
|
|
at the time of the write. See the
|
|
<a href="Datatypes.html#Datatypes-DataConversion">Data Conversion</a>
|
|
section of <cite>The Data Type Interface (H5T)</cite> in the
|
|
<cite>HDF5 User's Guide</cite> for a discussion of
|
|
data conversion, including the range of conversions currently
|
|
supported by the HDF5 libraries.
|
|
<p>
|
|
If the dataset's space allocation time is set to
|
|
<code>H5D_ALLOC_TIME_LATE</code> or <code>H5D_ALLOC_TIME_INCR</code>
|
|
and the space for the dataset has not yet been allocated,
|
|
that space is allocated when the first raw data is written to the
|
|
dataset.
|
|
Unused space in the dataset will be written with fill values at the
|
|
same time if the dataset's fill time is set to
|
|
<code>H5D_FILL_TIME_IFSET</code> or <code>H5D_FILL_TIME_ALLOC</code>.
|
|
(Also see
|
|
<a href="RM_H5P.html#Property-SetFillTime">H5Pset_fill_time</a>
|
|
and
|
|
<a href="RM_H5P.html#Property-SetAllocTime">H5Pset_alloc_time</a>.)
|
|
<p>
|
|
If a dataset's storage layout is 'compact', care must be taken when
|
|
writing data to the dataset in parallel. A compact dataset's raw data
|
|
is cached in memory and may be flushed to the file from any of the
|
|
parallel processes, so parallel applications should always attempt to
|
|
write identical data to the dataset from all processes.
|
|
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>hid_t</em> <code>dataset_id</code>
|
|
<dd>IN: Identifier of the dataset to write to.
|
|
<dt><em>hid_t</em> <code>mem_type_id</code>
|
|
<dd>IN: Identifier of the memory datatype.
|
|
<dt><em>hid_t</em> <code>mem_space_id</code>
|
|
<dd>IN: Identifier of the memory dataspace.
|
|
<dt><em>hid_t</em> <code>file_space_id</code>
|
|
<dd>IN: Identifier of the dataset's dataspace in the file.
|
|
<dt><em>hid_t</em> <code>xfer_plist_id</code>
|
|
<dd>IN: Identifier of a transfer property list
|
|
for this I/O operation.
|
|
<dt><em>const void *</em> <code>buf</code>
|
|
<dd>IN: Buffer with data to be written to the file.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns a non-negative value if successful;
|
|
otherwise returns a negative value.
|
|
<dt><strong>Fortran90 Interface:</strong> h5dwrite_f
|
|
|
|
<dd>There are seperate versions of this interface.
|
|
Their use depends on the datatype of the object being written.
|
|
|
|
<p>Use the following <code>h5dwrite_f</code> call for all
|
|
datatypes except object and dataset region references:
|
|
|
|
<dd>
|
|
<pre>
|
|
SUBROUTINE h5dwrite_f(dset_id, mem_type_id, buf, dims, hdferr, &
|
|
mem_space_id, file_space_id, xfer_prp)
|
|
|
|
IMPLICIT NONE
|
|
INTEGER(HID_T), INTENT(IN) :: dset_id ! Dataset identifier
|
|
INTEGER(HID_T), INTENT(IN) :: mem_type_id ! Memory datatype identifier
|
|
TYPE, INTENT(IN) :: buf ! Data buffer; may be a scalar
|
|
! or an array
|
|
DIMENSION(*), INTEGER(HSIZE_T), INTENT(IN) :: dims
|
|
! Array to hold corresponding
|
|
! dimension sizes of data
|
|
! buffer buf; dim(k) has value
|
|
! of the k-th dimension of
|
|
! buffer buf; values are
|
|
! ignored if buf is a scalar
|
|
INTEGER, INTENT(OUT) :: hdferr ! Error code
|
|
! 0 on success and -1 on failure
|
|
INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
|
|
! Memory dataspace identfier
|
|
! Default value is H5S_ALL_F
|
|
INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
|
|
! File dataspace identfier
|
|
! Default value is H5S_ALL_F
|
|
INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp
|
|
! Transfer property list
|
|
! identifier; default value
|
|
! is H5P_DEFAULT_F
|
|
|
|
END SUBROUTINE h5dwrite_f
|
|
</pre>
|
|
|
|
<p>Use the following <code>h5dwrite_f</code> call for object reference
|
|
and dataset region reference datatypes:
|
|
|
|
<pre>
|
|
SUBROUTINE h5dwrite_f(dset_id, mem_type_id, buf, n, hdferr, &
|
|
mem_space_id, file_space_id, xfer_prp)
|
|
|
|
IMPLICIT NONE
|
|
INTEGER(HID_T), INTENT(IN) :: dset_id ! Dataset identifier
|
|
INTEGER(HID_T), INTENT(IN) :: mem_type_id ! Memory datatype identifier
|
|
DIMENSION(*), INTEGER(HSIZE_T), INTENT(IN) :: dims
|
|
! Array to hold corresponding
|
|
! dimension sizes of data
|
|
! buffer buf
|
|
! dim(k) has valueof the k-th
|
|
! dimension of buffer buf;
|
|
! values are ignored if buf
|
|
! is a scalar
|
|
TYPE(hobj_ref_t_f), DIMENSION(dims(1)), INTENT(INOUT) :: buf
|
|
! Data buffer of rank 1
|
|
INTEGER, INTENT(OUT) :: hdferr ! Error code
|
|
! 0 on success and -1 on failure
|
|
INTEGER(HID_T), OPTIONAL, INTENT(IN) :: mem_space_id
|
|
! Memory dataspace identfier
|
|
! Default value is H5S_ALL_F
|
|
INTEGER(HID_T), OPTIONAL, INTENT(IN) :: file_space_id
|
|
! File dataspace identfier
|
|
! Default value is H5S_ALL_F
|
|
INTEGER(HID_T), OPTIONAL, INTENT(IN) :: xfer_prp
|
|
! Transfer property list identifier
|
|
! Default value is H5P_DEFAULT_F
|
|
|
|
END SUBROUTINE h5dwrite_f
|
|
</pre>
|
|
|
|
<!--<dt><strong>Non-C API(s):</strong>
|
|
<dd>
|
|
|
|
<img src="Graphics/Java.gif">
|
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<img src="Graphics/C++.gif">
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<!-- #BeginLibraryItem "/ed_libs/NavBar_RM.lbi" --><hr>
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<center>
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<table border=0 width=98%>
|
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<tr><td valign=top align=left>
|
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<a href="index.html">HDF5 documents and links</a> <br>
|
|
<a href="H5.intro.html">Introduction to HDF5</a> <br>
|
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<a href="http://hdf.ncsa.uiuc.edu/HDF5/doc/UG/index.html">HDF5 User Guide</a> <br>
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<!--
|
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<a href="Glossary.html">Glossary</a><br>
|
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-->
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</td>
|
|
<td valign=top align=right>
|
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And in this document, the
|
|
<a href="RM_H5Front.html">HDF5 Reference Manual</a>
|
|
<br>
|
|
<a href="RM_H5.html">H5</a>
|
|
<a href="RM_H5A.html">H5A</a>
|
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<a href="RM_H5D.html">H5D</a>
|
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<a href="RM_H5E.html">H5E</a>
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<a href="RM_H5F.html">H5F</a>
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<a href="RM_H5G.html">H5G</a>
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<a href="RM_H5I.html">H5I</a>
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<a href="RM_H5P.html">H5P</a>
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<br>
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<a href="RM_H5R.html">H5R</a>
|
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<a href="RM_H5S.html">H5S</a>
|
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<a href="RM_H5T.html">H5T</a>
|
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<a href="RM_H5Z.html">H5Z</a>
|
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<a href="Tools.html">Tools</a>
|
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<a href="PredefDTypes.html">Datatypes</a>
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</td></tr>
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</table>
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</center>
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<hr>
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<!-- #EndLibraryItem --><!-- #BeginLibraryItem "/ed_libs/Footer.lbi" --><address>
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<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
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<br>
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Describes HDF5 Release 1.7, the unreleased development branch; working toward HDF5 Release 1.8.0
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