mirror of
https://github.com/HDFGroup/hdf5.git
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4146d79af1
Purpose:
Changed "HDF5 User's Guide" links (in navigation bars, primarily)
to point to new user's guide, which will reside for a while yet on
the HDF server.
The old user's guide will still go out with the distribution under
the label "HDF5 User's Guide, Release 1.4.5."
Platforms tested:
IE 5
284 lines
9.7 KiB
HTML
284 lines
9.7 KiB
HTML
<html>
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<head><title>
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HDF5/H5I API Specification
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</title>
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<!-- #BeginLibraryItem "/ed_libs/styles_RM.lbi" -->
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<!--
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by the Board of Trustees of the University of Illinois. *
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* All rights reserved. *
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* *
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* This file is part of HDF5. The full HDF5 copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the files COPYING and Copyright.html. COPYING can be found at the root *
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* of the source code distribution tree; Copyright.html can be found at the *
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* root level of an installed copy of the electronic HDF5 document set and *
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* is linked from the top-level documents page. It can also be found at *
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* http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html. If you do not have *
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* access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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-->
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<link href="ed_styles/RMelect.css" rel="stylesheet" type="text/css">
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<body bgcolor="#FFFFFF">
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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>H5I: Identifier Interface</h1>
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</center>
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<h2>Identifier API Functions</h2>
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These functions provides tools for working with object identifiers and
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object names.
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<p>
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<strong>The C Interface:</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="#Identify-GetName">H5Iget_name</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="#Identify-GetType">H5Iget_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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</ul>
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</td></tr>
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</table>
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<p>
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<strong>The FORTRAN90 Interface:</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="#Identify-GetName">h5iget_name_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="#Identify-GetType">h5iget_type_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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</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="Identify-GetType">H5Iget_type</a>
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<dt><strong>Signature:</strong>
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<dd><em>H5I_type_t</em> <code>H5Iget_type</code>(<em>hid_t</em> <code>obj_id</code>)
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<dt><strong>Purpose:</strong>
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<dd>Retrieves the type of an object.
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<dt><strong>Description:</strong>
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<dd><code>H5Iget_type</code> retrieves the type of the object
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identified by <code>obj_id</code>.
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<p>
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Valid types returned by the function are
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<table>
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<tr><td width=200><code> H5I_FILE</code>
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</td><td>File</td></tr>
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<tr><td><code> H5I_GROUP</code>
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</td><td>Group</td></tr>
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<tr><td><code> H5I_DATATYPE</code>
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</td><td>Datatype</td></tr>
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<tr><td><code> H5I_DATASPACE</code>
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</td><td>Dataspace</td></tr>
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<tr><td><code> H5I_DATASET</code>
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</td><td>Dataset</td></tr>
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<tr><td><code> H5I_ATTR</code>
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</td><td>Attribute</td></tr>
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</table>
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If no valid type can be determined or the identifier
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submitted is invalid, the function returns
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<table>
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<tr><td width=200><code> H5I_BADID</code>
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</td><td>Invalid identifier</td></tr>
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</table>
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<p>
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This function is of particular value in determining the
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type of object closing function (<code>H5Dclose</code>,
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<code>H5Gclose</code>, etc.) to call after a call to
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<code>H5Rdereference</code>.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>hid_t</em> <code>obj_id</code>
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<dd>IN: Object identifier whose type is to be determined.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns the object type if successful;
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otherwise <code>H5I_BADID</code>.
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<dt><strong>Non-C API(s):</strong>
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<dd><a href="fortran/h5i_FORTRAN.html#h5iget_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="Identify-GetName">H5Iget_name</a>
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<dt><strong>Signature:</strong>
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<dd><em>ssize_t</em> <code>H5Iget_name</code>(<em>hid_t</em> <code>obj_id</code>,
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<em>char *</em><code>name</code>,
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<em>size_t</em> <code>size</code>
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)
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<dt><strong>Purpose:</strong> </dt>
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<dd>Retrieves a name of an object based on the object identifier.
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<dt><strong>Description:</strong>
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<dd><code>H5Iget_name</code> retrieves a name for the object identified
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by <code>obj_id</code>.
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<p>
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Up to <code>size</code> characters of the name are returned in
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<code>name</code>; additional characters, if any, are not returned
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to the user application.
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<p>
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If the length of the name, which determines the required
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value of <code>size</code>, is unknown, a preliminary
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<code>H5Iget_name</code> call can be made.
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The return value of this call will be the size of the
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object name.
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That value can then be assigned to <code>size</code>
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for a second <code>H5Iget_name</code> call,
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which will retrieve the actual name.
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<p>
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If there is no name associated with the object identifier
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or if the name is <code>NULL</code>, <code>H5Iget_name</code>
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returns <code>0</code> (zero).
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<p>
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Note that an object in an HDF5 file may have multiple names,
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varying according to the path through the HDF5 group
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hierarchy used to reach that object.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>hid_t</em> <code>obj_id</code>
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<dd>IN: Identifier of the object.
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This identifier can refer to a group, dataset, or
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named datatype.
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<dt><em>char *</em><code>name</code>
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<dd>OUT: A name associated with the identifier.
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<dt><em>size_t size</em>
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<dd>IN: The size of the <code>name</code> buffer.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns the length of the name if successful,
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returning <code>0</code> (zero) if no name is associated with the identifier.
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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/h5i_FORTRAN.html#h5iget_name_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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<!-- #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 --><!-- #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 1.6.0, July 2003
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</address><!-- #EndLibraryItem -->
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Last modified: 10 June 2003
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</body>
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</html>
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