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<html>
<head><title>
HDF5/H5I API Specification
</title>

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<h1>H5I: Identifier Interface</h1>
</center>

<h2>Identifier API Functions</h2>

These functions provides tools for working with object identifiers and 
object names.


<p>
<strong>The C Interface:</strong>

<table border=0>
<tr><td valign=top>
<ul>
    <li><a href="#Identify-GetName">H5Iget_name</a>
</ul>
</td><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign=top>
<ul>
    <li><a href="#Identify-GetType">H5Iget_type</a>
</ul>
</td><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign=top>
<ul>
    &nbsp;
</ul>
</td></tr>
</table>


<p>
<strong>The FORTRAN90 Interface:</strong>

<br>
<font size=-1>
<i>In general, each FORTRAN90 subroutine performs exactly the same task 
as the corresponding C function.  The links below go to the C function 
descriptions, which serve as general descriptions for both.  A button, 
under <strong>Non-C API(s)</strong> at the end of the C function description,
opens an external browser window displaying the FORTRAN90-specific 
information.  You will probably want to adjust the size and location of 
this external window so that both browser windows are visible and to 
facilitate moving easily between them.</i>
</font>

<table border=0>
<tr><td valign=top>
<ul>
    <li><a href="#Identify-GetName">h5iget_name_f</a>
</ul>
</td><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign=top>
<ul>
    <li><a href="#Identify-GetType">h5iget_type_f</a>
</ul>
</td><td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</td><td valign=top>
<ul>
    &nbsp;
</ul>
</td></tr>
</table>


<hr>
<dl>
<dt><strong>Name:</strong> <a name="Identify-GetType">H5Iget_type</a>
<dt><strong>Signature:</strong>
    <dd><em>H5I_type_t</em> <code>H5Iget_type</code>(<em>hid_t</em> <code>obj_id</code>)
<dt><strong>Purpose:</strong>
    <dd>Retrieves the type of an object.
<dt><strong>Description:</strong>
    <dd><code>H5Iget_type</code> retrieves the type of the object
        identified by <code>obj_id</code>.
        <p>
        Valid types returned by the function are 
        <table>
        <tr><td width=200><code>&nbsp;&nbsp;&nbsp;&nbsp;H5I_FILE</code>
           </td><td>File</td></tr>
        <tr><td><code>&nbsp;&nbsp;&nbsp;&nbsp;H5I_GROUP</code>
           </td><td>Group</td></tr>
        <tr><td><code>&nbsp;&nbsp;&nbsp;&nbsp;H5I_DATATYPE</code>
           </td><td>Datatype</td></tr>
        <tr><td><code>&nbsp;&nbsp;&nbsp;&nbsp;H5I_DATASPACE</code>
           </td><td>Dataspace</td></tr>
        <tr><td><code>&nbsp;&nbsp;&nbsp;&nbsp;H5I_DATASET</code>
           </td><td>Dataset</td></tr>
        <tr><td><code>&nbsp;&nbsp;&nbsp;&nbsp;H5I_ATTR</code>
           </td><td>Attribute</td></tr>
        </table>
        If no valid type can be determined or the identifier 
        submitted is invalid, the function returns
        <table>
        <tr><td width=200><code>&nbsp;&nbsp;&nbsp;&nbsp;H5I_BADID</code>
           </td><td>Invalid identifier</td></tr>
        </table>
        <p>
        This function is of particular value in determining the 
        type of object closing function (<code>H5Dclose</code>, 
        <code>H5Gclose</code>, etc.) to call after a call to 
        <code>H5Rdereference</code>.
<dt><strong>Parameters:</strong>
    <dl>
        <dt><em>hid_t</em> <code>obj_id</code>
            <dd>IN: Object identifier whose type is to be determined.
    </dl>
<dt><strong>Returns:</strong>
    <dd>Returns the object type if successful;
        otherwise <code>H5I_BADID</code>.
<dt><strong>Non-C API(s):</strong>
    <dd><a href="fortran/h5i_FORTRAN.html#h5iget_type_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="Identify-GetName">H5Iget_name</a>
<dt><strong>Signature:</strong>
    <dd><em>ssize_t</em> <code>H5Iget_name</code>(<em>hid_t</em> <code>obj_id</code>,
		     <em>char *</em><code>name</code>,
		     <em>size_t</em> <code>size</code>
                     )
<dt><strong>Purpose:</strong> </dt>
    <dd>Retrieves a name of an object based on the object identifier.
<dt><strong>Description:</strong>
    <dd><code>H5Iget_name</code> retrieves a name for the object identified 
        by <code>obj_id</code>.
        <p>
        Up to <code>size</code> characters of the name are returned in 
        <code>name</code>; additional characters, if any, are not returned
        to the user application.
        <p>
	If the length of the name, which determines the required 
	value of <code>size</code>, is unknown, a preliminary  
	<code>H5Iget_name</code> call can be made.  
	The return value of this call will be the size of the 
	object name.  
	That value can then be assigned to <code>size</code> 
	for a second <code>H5Iget_name</code> call, 
	which will retrieve the actual name.
	<p>
        If there is no name associated with the object identifier
	or if the name is <code>NULL</code>, <code>H5Iget_name</code>
        returns <code>0</code> (zero).
	<p>
	Note that an object in an HDF5 file may have multiple names,
	varying according to the path through the HDF5 group 
	hierarchy used to reach that object.
<dt><strong>Parameters:</strong> 
    <dl>
    <dt><em>hid_t</em>  <code>obj_id</code> 
        <dd>IN: Identifier of the object.  
            This identifier can refer to a group, dataset, or 
	    named datatype. 
    <dt><em>char *</em><code>name</code> 
        <dd>OUT: A name associated with the identifier.
    <dt><em>size_t size</em> 
        <dd>IN: The size of the <code>name</code> buffer.
    </dl>
<dt><strong>Returns:</strong> 
    <dd>Returns the length of the name if successful,
        returning <code>0</code> (zero) if no name is associated with the identifier.
        Otherwise returns a negative value.
<dt><strong>Non-C API(s):</strong>
    <dd><a href="fortran/h5i_FORTRAN.html#h5iget_name_f" 
        target="FortranWin"><img src="Graphics/FORTRAN.gif" border=0></a>
        <!--
        <img src="Graphics/Java.gif"> 
        <img src="Graphics/C++.gif">
        -->
</dl>


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<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a> 
<br>
Describes HDF5 Release 1.6.0, July 2003
</address><!-- #EndLibraryItem -->
 
Last modified: 10 June 2003

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