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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>


<br>
<strong>The FORTRAN90 Interfaces:</strong>
<br>
In general, each FORTRAN90 subroutine performs exactly the same task 
as the corresponding C function.  
<br>

<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>

<!-- NEW PAGE -->
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<!-- HEADER RIGHT "H5Iget_name" -->
<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>Fortran90 Interface:</strong> h5iget_name_f
    <dd>
	<pre>
SUBROUTINE h5iget_name_f(obj_id, buf, buf_size, hdferr) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN)    :: obj_id     ! Object identifier 
  CHARACTER(LEN=*), INTENT(OUT) :: buf        ! Buffer to hold object name 
  INTEGER(SIZE_T), INTENT(IN)   :: buf_size   ! Buffer size
  INTEGER(SIZE_T), INTENT(OUT)  :: name_size  ! Name size
  INTEGER, INTENT(OUT) :: hdferr              ! Error code
                                              ! 0 on success, and -1 on failure
END SUBROUTINE h5iget_name_f
	</pre>		
		
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<!-- HEADER RIGHT "H5Iget_type" -->
<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>Fortran90 Interface:</strong> h5iget_type_f
    <dd>
	<pre>
SUBROUTINE h5iget_type_f(obj_id, type, hdferr) 
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: obj_id  !Object identifier 
  INTEGER, INTENT(OUT) :: type          !type of an object. 
                                        !possible values are:
                                        !H5I_FILE_F(1)
                                        !H5I_GROUP_F(2)
                                        !H5I_DATATYPE_F(3)
                                        !H5I_DATASPACE_F(4)
                                        !H5I_DATASET_F(5)
                                        !H5I_ATTR_F(6)
                                        !H5I_BADID_F(-1)
  INTEGER, INTENT(OUT) :: hdferr        ! E rror code
                                        ! 0 on success, and -1 on failure
END SUBROUTINE h5iget_type_f
	</pre>		
		
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Describes HDF5 Release 1.7, the unreleased development branch; working toward HDF5 Release 1.8.0
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