mirror of
https://github.com/HDFGroup/hdf5.git
synced 2024-11-27 02:10:55 +08:00
5228ba6c71
H5Dclose: Corrected return type to herr_t (was hid_t).
H5Dcreate: Inserted missing spaces in function syntax statement.
RM_H5E.html
H5Ewalk: Added H5E_walk_t prototype and prototype parameter
descriptions.
RM_H5F.html
H5Fclose: Corrected behavior description, eliminating
comment that function fials if other access identifiers
are still open and describing actual behavior.
RM_H5T.html
H5Tregister: Corrected possible 'pers' values to H5T_PERS_HARD
(was HARD) and H5T_PERS_SOFT (was SOFT).
H5Tfind: Corrected 'pcdata' parameter IN/OUT designation.
775 lines
30 KiB
HTML
775 lines
30 KiB
HTML
<html>
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<head><title>
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HDF5/H5D API Specification
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</title></head>
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<body bgcolor="#FFFFFF">
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<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="H5.intro.html">Introduction to HDF5</a> <br>
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<a href="H5.user.html">HDF5 User Guide</a> <br>
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<a href="index.html">Other HDF5 documents and links</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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H5D
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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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<br>
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<a href="RM_H5P.html">H5P</a>
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<a href="RM_H5R.html">H5R</a>
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<a href="RM_H5RA.html">H5RA</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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</td></tr>
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</table>
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</center>
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<hr>
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<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-GetType">H5Dget_type</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-GetCreatePlist">H5Dget_create_plist</a>
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<li><a href="#Dataset-GetStorageSize">H5Dget_storage_size</a>
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<li><a href="#Dataset-GetVLBuf">H5Dget_vlen_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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<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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<!--
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<li><a href="#Dataset-Debug">H5Ddebug</a>
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-->
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<li><a href="#Dataset-Extend">H5Dextend</a>
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</ul>
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</td></tr>
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</table>
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<p>
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<strong>The FORTRAN90 Interfaces:</strong>
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<br>
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<font size=-1>
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<i>In general, each FORTRAN90 subroutine performs exactly the same task
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as the corresponding C function. The links below go to the C function
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descriptions, which serve as general descriptions for both. A button,
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under <strong>Non-C API(s)</strong> at the end of the C function description,
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opens an external browser window displaying the FORTRAN90-specific
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information. You will probably want to adjust the size and location of
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this external window so that both browser windows are visible and to
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facilitate moving easily between them.</i>
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</font>
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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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</ul>
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</td><td> </td><td valign=top>
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<ul>
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<li><a href="#Dataset-GetSpace">h5dget_space_f</a>
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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-GetStorageSize">h5dget_storage_size_f</a> -->
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<!--<li><a href="#Dataset-GetVLBuf">h5dget_vlen_buf_size_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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</ul>
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</td></tr>
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</table>
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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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<code>H5Dcreate()</code> returns a dataset identifier for success
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or negative for failure. The identifier should eventually be
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closed by calling <code>H5Dclose()</code> to release resources
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it uses.
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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>Identifier of the file or group to create the dataset within.
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<dt><em>const char *</em> <code>name</code>
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<dd>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>Identifier of the datatype to use when creating the dataset.
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<dt><em>hid_t</em> <code>space_id</code>
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<dd>Identifier of the dataspace to use when creating the dataset.
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<dt><em>hid_t</em> <code>create_plist_id</code>
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<dd>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>Non-C API(s):</strong>
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<dd><a href="fortran/h5d_FORTRAN.html#h5dcreate_f"
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target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a>
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<!--
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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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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataset-Open">H5Dopen</a>
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<dt><strong>Signature:</strong>
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<dd><em>hid_t </em><code>H5Dopen</code>(<em>hid_t </em><code>loc_id</code>,
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<em>const char *</em><code>name</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Opens an existing dataset.
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<dt><strong>Description:</strong>
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<dd><code>H5Dopen</code> opens an existing dataset for access in the file
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or group specified in <code>loc_id</code>. <code>name</code> is
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a dataset name and is used to identify the dataset in the file.
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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>Identifier of the file or group to access the dataset within.
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<dt><em>const char *</em> <code>name</code>
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<dd>The name of the dataset to access.
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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>Non-C API(s):</strong>
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<dd><a href="fortran/h5d_FORTRAN.html#h5dopen_f"
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target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a>
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<!--
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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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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataset-GetSpace">H5Dget_space</a>
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<dt><strong>Signature:</strong>
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<dd><em>hid_t </em><code>H5Dget_space</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>Returns an identifier for a copy of the dataspace for a dataset.
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<dt><strong>Description:</strong>
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<dd><code>H5Dget_space</code> returns an identifier for a copy of the
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dataspace for a dataset.
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The dataspace identifier should be released with the
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<code>H5Sclose()</code> function.
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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>Identifier of the dataset to query.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a dataspace identifier if successful;
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otherwise returns a negative value.
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<dt><strong>Non-C API(s):</strong>
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<dd><a href="fortran/h5d_FORTRAN.html#h5dget_space_f"
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target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a>
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<!--
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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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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataset-GetType">H5Dget_type</a>
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<dt><strong>Signature:</strong>
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<dd><em>hid_t </em><code>H5Dget_type</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>Returns an identifier for a copy of the datatype for a dataset.
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<dt><strong>Description:</strong>
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<dd><code>H5Dget_type</code> returns an identifier for a copy of the
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datatype for a dataset.
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The datatype should be released with the <code>H5Tclose()</code> function.
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<p>
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If a dataset has a named datatype, then an identifier to the
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opened datatype is returned.
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Otherwise, the returned datatype is read-only.
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If atomization of the datatype fails, then the datatype is closed.
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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>Identifier of the dataset to query.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a datatype identifier if successful;
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otherwise returns a negative value.
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<dt><strong>Non-C API(s):</strong>
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<dd><a href="fortran/h5d_FORTRAN.html#h5dget_type_f"
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target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a>
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<!--
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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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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataset-GetCreatePlist">H5Dget_create_plist</a>
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<dt><strong>Signature:</strong>
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<dd><em>hid_t </em><code>H5Dget_create_plist</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>Returns an identifier for a copy of the
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dataset creation property list for a dataset.
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<dt><strong>Description:</strong>
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<dd><code>H5Dget_create_plist</code> returns an identifier for a
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copy of the dataset creation property list for a dataset.
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The creation property list identifier should be released with
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the <code>H5Pclose()</code> function.
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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>Identifier of the dataset to query.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a dataset creation property list identifier if successful;
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otherwise returns a negative value.
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<dt><strong>Non-C API(s):</strong>
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<dd><a href="fortran/h5d_FORTRAN.html#h5dget_create_plist_f"
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target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a>
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<!--
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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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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataset-GetStorageSize">H5Dget_storage_size</a>
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<dt><strong>Signature:</strong>
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<dd><em>hsize_t </em><code>H5Dget_storage_size</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>Returns the amount of storage required for a dataset.
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<dt><strong>Description:</strong>
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<dd><code>H5Dget_storage_size</code> returns the amount of storage
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that is required for the specified dataset, <code>dataset_id</code>.
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For chunked datasets, this is the number of allocated chunks times
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the chunk size.
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The return value may be zero if no data has been stored.
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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>Identifier of the dataset to query.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns the amount of storage space allocated for the dataset,
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not counting meta data;
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otherwise returns a negative value.
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<!--
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<dt><strong>Non-C API(s):</strong>
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<dd><a href="fortran/h5d_FORTRAN.html#h5dget_storage_size"
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target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a>
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--> <!--
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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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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataset-GetVLBuf">H5Dget_vlen_buf_size</a>
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<i><b>(Not yet implemented.)</b></i>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t </em><code>H5Dget_vlen_buf_size</code>(<em>hid_t </em><code>dataset_id</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>hsize_t</em> *<code>size</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Determines the number of bytes required to store VL data.
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<dt><strong>Description:</strong>
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<dd><code>H5Dget_vlen_buf_size</code> determines the number of bytes
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required to store the VL data from the dataset, using the
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<code>space_id</code> for the selection in the dataset on
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disk and the <code>type_id</code> for the memory representation
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of the VL data in memory.
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<p>
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<code>*size</code> is returned with the number of bytes are
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required to store the VL data in memory.
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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>Identifier of the dataset to query.
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<dt><em>hid_t</em> <code>type_id</code>
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<dd>Identifier of the datatype.
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<dt><em>hid_t</em> <code>space_id</code>
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<dd>Identifier of the dataspace.
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<dt><em>hsize_t</em> *<code>size</code>
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<dd>The size in bytes of the buffer required to store the VL data.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns non-negative value if successful;
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otherwise returns a negative value.
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<!--
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<dt><strong>Non-C API(s):</strong>
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<dd><a href="fortran/h5d_FORTRAN.html#h5dget_vlen_buf_size_f"
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target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a>
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--> <!--
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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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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="Dataset-VLReclaim">H5Dvlen_reclaim</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t </em><code>H5Dvlen_reclaim</code>(<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>plist_id</code>,
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<em>void</em> *<code>buf</code>
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)
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<dt><strong>Purpose:</strong>
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<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>Identifier of the datatype.
|
|
<dt><em>hid_t</em> <code>space_id</code>
|
|
<dd>Identifier of the dataspace.
|
|
<dt><em>hid_t</em> <code>plist_id</code>
|
|
<dd>Identifier of the property list used to create the buffer.
|
|
<dt><em>void</em> *<code>buf</code>
|
|
<dd>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>Non-C API(s):</strong>
|
|
<dd><a href="fortran/h5d_FORTRAN.html#h5dvlen_reclaim_f"
|
|
target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a>
|
|
--> <!--
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
|
|
<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 the specified dataset into <code>buf</code>,
|
|
converting from file datatype and dataspace to
|
|
memory datatype and dataspace.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dread</code> reads a (partial) dataset, specified by its
|
|
identifier <code>dataset_id</code>, from the file into the
|
|
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> can be the constant <code>H5S_ALL</code>,
|
|
which indicates that the entire file data space is to be referenced.
|
|
<p>
|
|
<code>mem_space_id</code> can be the constant <code>H5S_ALL</code>,
|
|
in which case the memory data space is the same as the file data space
|
|
defined when the dataset was created.
|
|
<p>
|
|
The number of elements in the memory data space must match
|
|
the number of elements in the file data space.
|
|
<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>
|
|
Datatype conversion takes place at the time of a read or write
|
|
and is automatic. 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>Identifier of the dataset read from.
|
|
<dt><em>hid_t</em> <code>mem_type_id</code>
|
|
<dd>Identifier of the memory datatype.
|
|
<dt><em>hid_t</em> <code>mem_space_id</code>
|
|
<dd>Identifier of the memory dataspace.
|
|
<dt><em>hid_t</em> <code>file_space_id</code>
|
|
<dd>Identifier of the dataset's dataspace in the file.
|
|
<dt><em>hid_t</em> <code>xfer_plist_id</code>
|
|
<dd>Identifier of a transfer property list for this I/O operation.
|
|
<dt><em>void *</em> <code>buf</code>
|
|
<dd>Buffer to store data read from the file.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns a non-negative value if successful;
|
|
otherwise returns a negative value.
|
|
<dt><strong>Non-C API(s):</strong>
|
|
<dd><a href="fortran/h5d_FORTRAN.html#h5dread_f"
|
|
target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a>
|
|
<!--
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
|
|
<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 an application buffer <code>buf</code> to
|
|
the specified dataset, converting from
|
|
memory datatype and dataspace to file datatype and dataspace.
|
|
<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> can be the constant <code>H5S_ALL</code>.
|
|
which indicates that the entire file data space is to be referenced.
|
|
<p>
|
|
<code>mem_space_id</code> can be the constant <code>H5S_ALL</code>,
|
|
in which case the memory data space is the same as the file data space
|
|
defined when the dataset was created.
|
|
<p>
|
|
The number of elements in the memory data space must match
|
|
the number of elements in the file data space.
|
|
<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 external dataset will fail if the HDF5 file is
|
|
not open for writing.
|
|
<p>
|
|
Datatype conversion takes place at the time of a read or write
|
|
and is automatic. 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>Identifier of the dataset read from.
|
|
<dt><em>hid_t</em> <code>mem_type_id</code>
|
|
<dd>Identifier of the memory datatype.
|
|
<dt><em>hid_t</em> <code>mem_space_id</code>
|
|
<dd>Identifier of the memory dataspace.
|
|
<dt><em>hid_t</em> <code>file_space_id</code>
|
|
<dd>Identifier of the dataset's dataspace in the file.
|
|
<dt><em>hid_t</em> <code>xfer_plist_id</code>
|
|
<dd>Identifier of a transfer property list for this I/O operation.
|
|
<dt><em>const void *</em> <code>buf</code>
|
|
<dd>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>Non-C API(s):</strong>
|
|
<dd><a href="fortran/h5d_FORTRAN.html#h5dwrite_f"
|
|
target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a>
|
|
<!--
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-Extend">H5Dextend</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>herr_t </em><code>H5Dextend</code>(<em>hid_t </em><code>dataset_id</code>,
|
|
<em>const hsize_t *</em> <code>size</code>
|
|
)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Extends a dataset with unlimited dimension.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dextend</code> verifies that the dataset is at least of size
|
|
<code>size</code>.
|
|
The dimensionality of <code>size</code> is the same as that of
|
|
the dataspace of the dataset being changed.
|
|
This function cannot be applied to a dataset with fixed dimensions.
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>hid_t</em> <code>dataset_id</code>
|
|
<dd>Identifier of the dataset.
|
|
<dt><em>const hsize_t *</em> <code>size</code>
|
|
<dd>Array containing the new magnitude of each dimension.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns a non-negative value if successful;
|
|
otherwise returns a negative value.
|
|
<dt><strong>Non-C API(s):</strong>
|
|
<dd><a href="fortran/h5d_FORTRAN.html#h5dextend_f"
|
|
target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a>
|
|
<!--
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
|
|
<hr>
|
|
<dl>
|
|
<dt><strong>Name:</strong> <a name="Dataset-Close">H5Dclose</a>
|
|
<dt><strong>Signature:</strong>
|
|
<dd><em>herr_t </em><code>H5Dclose</code>(<em>hid_t </em><code>dataset_id</code>
|
|
)
|
|
<dt><strong>Purpose:</strong>
|
|
<dd>Closes the specified dataset.
|
|
<dt><strong>Description:</strong>
|
|
<dd><code>H5Dclose</code> ends access to a dataset specified by
|
|
<code>dataset_id</code> and releases resources used by it.
|
|
Further use of the dataset identifier is illegal in calls to
|
|
the dataset API.
|
|
<dt><strong>Parameters:</strong>
|
|
<dl>
|
|
<dt><em>hid_t</em> <code>dataset_id</code>
|
|
<dd>Identifier of the dataset to finish access to.
|
|
</dl>
|
|
<dt><strong>Returns:</strong>
|
|
<dd>Returns a non-negative value if successful;
|
|
otherwise returns a negative value.
|
|
<dt><strong>Non-C API(s):</strong>
|
|
<dd><a href="fortran/h5d_FORTRAN.html#h5dclose_f"
|
|
target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a>
|
|
<!--
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
|
|
<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>Non-C API(s):</strong>
|
|
<dd><a href="fortran/h5d_FORTRAN.html#h5diterate_f"
|
|
target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a>
|
|
--> <!--
|
|
<img src="Graphics/Java.gif">
|
|
<img src="Graphics/C++.gif">
|
|
-->
|
|
</dl>
|
|
|
|
|
|
|
|
<hr>
|
|
<center>
|
|
<table border=0 width=98%>
|
|
<tr><td valign=top align=left>
|
|
<a href="H5.intro.html">Introduction to HDF5</a> <br>
|
|
<a href="H5.user.html">HDF5 User Guide</a> <br>
|
|
<a href="index.html">Other HDF5 documents and links</a> <br>
|
|
<!--
|
|
<a href="Glossary.html">Glossary</a><br>
|
|
-->
|
|
</td>
|
|
<td valign=top align=right>
|
|
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>
|
|
H5D
|
|
<a href="RM_H5E.html">H5E</a>
|
|
<a href="RM_H5F.html">H5F</a>
|
|
<a href="RM_H5G.html">H5G</a>
|
|
<a href="RM_H5I.html">H5I</a>
|
|
<br>
|
|
<a href="RM_H5P.html">H5P</a>
|
|
<a href="RM_H5R.html">H5R</a>
|
|
<a href="RM_H5RA.html">H5RA</a>
|
|
<a href="RM_H5S.html">H5S</a>
|
|
<a href="RM_H5T.html">H5T</a>
|
|
<a href="RM_H5Z.html">H5Z</a>
|
|
<a href="Tools.html">Tools</a>
|
|
</td></tr>
|
|
</table>
|
|
</center>
|
|
<hr>
|
|
|
|
|
|
<address>
|
|
<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
|
|
|
|
<br>
|
|
Last modified: 20 October 1999
|
|
|
|
</body>
|
|
</html>
|