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<head><title>
HDF5/H5T API Specification
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<a href="H5.intro.html">Introduction to HDF5</a> <br>
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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_H5E.html">H5E</a>
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<h1>H5T: Datatype Interface</h1>
</center>
<h2>Datatype Object API Functions</h2>
These functions create and manipulate the datatype which describes elements
of a dataset.
<p>
<strong>The C Interfaces:</strong>
<table border=0>
<tr><td valign=top>
<i>General Datatype Operations</i>
<li><a href="#Datatype-Create">H5Tcreate</a>
<li><a href="#Datatype-Open">H5Topen</a>
<li><a href="#Datatype-Commit">H5Tcommit</a>
<li><a href="#Datatype-Committed">H5Tcommitted</a>
<li><a href="#Datatype-Copy">H5Tcopy</a>
<li><a href="#Datatype-Equal">H5Tequal</a>
<li><a href="#Datatype-Lock">H5Tlock</a>
<li><a href="#Datatype-GetClass">H5Tget_class</a>
<li><a href="#Datatype-GetSize">H5Tget_size</a>
<li><a href="#Datatype-GetSuper">H5Tget_super</a>
<li><a href="#Datatype-GetNativeType">H5Tget_native_type</a>
<li><a href="#Datatype-DetectClass">H5Tdetect_class</a>
<li><a href="#Datatype-Close">H5Tclose</a>
<p>
<i>Conversion Functions</i>
<li><a href="#Datatype-Convert">H5Tconvert</a>
<li><a href="#Datatype-Find">H5Tfind</a>
<li><a href="#Datatype-SetOverflow">H5Tset_overflow</a>
<li><a href="#Datatype-GetOverflow">H5Tget_overflow</a>
<li><a href="#Datatype-Register">H5Tregister</a>
<li><a href="#Datatype-Unregister">H5Tunregister</a>
</td><td> </td><td valign=top>
<i>Atomic Datatype Properties</i>
<table><tr><td valign=top>
<li><a href="#Datatype-SetSize">H5Tset_size</a>
<li><a href="#Datatype-GetOrder">H5Tget_order</a>
<li><a href="#Datatype-SetOrder">H5Tset_order</a>
<li><a href="#Datatype-GetPrecision">H5Tget_precision</a>
<li><a href="#Datatype-SetPrecision">H5Tset_precision</a>
<li><a href="#Datatype-GetOffset">H5Tget_offset</a>
<li><a href="#Datatype-SetOffset">H5Tset_offset</a>
<li><a href="#Datatype-GetPad">H5Tget_pad</a>
<li><a href="#Datatype-SetPad">H5Tset_pad</a>
<li><a href="#Datatype-GetSign">H5Tget_sign</a>
<li><a href="#Datatype-SetSign">H5Tset_sign</a>
</td><td valign=top>
<li><a href="#Datatype-GetFields">H5Tget_fields</a>
<li><a href="#Datatype-SetFields">H5Tset_fields</a>
<li><a href="#Datatype-GetEbias">H5Tget_ebias</a>
<li><a href="#Datatype-SetEbias">H5Tset_ebias</a>
<li><a href="#Datatype-GetNorm">H5Tget_norm</a>
<li><a href="#Datatype-SetNorm">H5Tset_norm</a>
<li><a href="#Datatype-GetInpad">H5Tget_inpad</a>
<li><a href="#Datatype-SetInpad">H5Tset_inpad</a>
<li><a href="#Datatype-GetCset">H5Tget_cset</a>
<li><a href="#Datatype-SetCset">H5Tset_cset</a>
<li><a href="#Datatype-GetStrpad">H5Tget_strpad</a>
<li><a href="#Datatype-SetStrpad">H5Tset_strpad</a>
</td></tr></table>
<p>
<i>Enumeration Datatypes</i>
<li><a href="#Datatype-EnumCreate">H5Tenum_create</a>
<li><a href="#Datatype-EnumInsert">H5Tenum_insert</a>
<li><a href="#Datatype-EnumNameOf">H5Tenum_nameof</a>
<li><a href="#Datatype-EnumValueOf">H5Tenum_valueof</a>
<li><a href="#Datatype-GetMemberValue">H5Tget_member_value</a>
<li><a href="#Datatype-GetNmembers">H5Tget_nmembers</a>
<li><a href="#Datatype-GetMemberName">H5Tget_member_name</a>
<li><a href="#Datatype-GetMemberIndex">H5Tget_member_index</a>
</td><td> </td><td valign=top>
<i>Compound Datatype Properties</i>
<li><a href="#Datatype-GetNmembers">H5Tget_nmembers</a>
<li><a href="#Datatype-GetMemberClass">H5Tget_member_class</a>
<li><a href="#Datatype-GetMemberName">H5Tget_member_name</a>
<li><a href="#Datatype-GetMemberIndex">H5Tget_member_index</a>
<li><a href="#Datatype-GetMemberOffset">H5Tget_member_offset</a>
<li><a href="#Datatype-GetMemberType">H5Tget_member_type</a>
<li><a href="#Datatype-Insert">H5Tinsert</a>
<li><a href="#Datatype-Pack">H5Tpack</a>
<p>
<i>Array Datatypes</i>
<li><a href="#Datatype-ArrayCreate">H5Tarray_create</a>
<li><a href="#Datatype-GetArrayNdims">H5Tget_array_ndims</a>
<li><a href="#Datatype-GetArrayDims">H5Tget_array_dims</a>
<p>
<i>Variable-length Datatypes</i>
<li><a href="#Datatype-VLCreate">H5Tvlen_create</a>
<li><a href="#Datatype-IsVariableString">H5Tis_variable_str</a>
<p>
<i>Opaque Datatypes</i>
<li><a href="#Datatype-SetTag">H5Tset_tag</a>
<li><a href="#Datatype-GetTag">H5Tget_tag</a>
</td></tr>
</table>
<br>
<!-- NEW PAGE -->
<i>Alphabetical Listing</i>
<table border="0" width=100%>
<tr>
<td valign="top" width=30%>
<li><a href="#Datatype-ArrayCreate">H5Tarray_create</a>
<li><a href="#Datatype-Close">H5Tclose</a>
<li><a href="#Datatype-Commit">H5Tcommit</a>
<li><a href="#Datatype-Committed">H5Tcommitted</a>
<li><a href="#Datatype-Convert">H5Tconvert</a>
<li><a href="#Datatype-Copy">H5Tcopy</a>
<li><a href="#Datatype-Create">H5Tcreate</a>
<li><a href="#Datatype-DetectClass">H5Tdetect_class</a>
<li><a href="#Datatype-EnumCreate">H5Tenum_create</a>
<li><a href="#Datatype-EnumInsert">H5Tenum_insert</a>
<li><a href="#Datatype-EnumNameOf">H5Tenum_nameof</a>
<li><a href="#Datatype-EnumValueOf">H5Tenum_valueof</a>
<li><a href="#Datatype-Equal">H5Tequal</a>
<li><a href="#Datatype-Find">H5Tfind</a>
<li><a href="#Datatype-GetArrayDims">H5Tget_array_dims</a>
<li><a href="#Datatype-GetArrayNdims">H5Tget_array_ndims</a>
<li><a href="#Datatype-GetClass">H5Tget_class</a>
<li><a href="#Datatype-GetCset">H5Tget_cset</a>
<li><a href="#Datatype-GetEbias">H5Tget_ebias</a>
<li><a href="#Datatype-GetFields">H5Tget_fields</a>
<li><a href="#Datatype-GetInpad">H5Tget_inpad</a>
</td>
<td width=3%> </td>
<td valign="top" width=30%>
<li><a href="#Datatype-GetMemberClass">H5Tget_member_class</a>
<li><a href="#Datatype-GetMemberIndex">H5Tget_member_index</a>
<li><a href="#Datatype-GetMemberName">H5Tget_member_name</a>
<li><a href="#Datatype-GetMemberOffset">H5Tget_member_offset</a>
<li><a href="#Datatype-GetMemberType">H5Tget_member_type</a>
<li><a href="#Datatype-GetMemberValue">H5Tget_member_value</a>
<li><a href="#Datatype-GetNativeType">H5Tget_native_type</a>
<li><a href="#Datatype-GetNmembers">H5Tget_nmembers</a>
<li><a href="#Datatype-GetNorm">H5Tget_norm</a>
<li><a href="#Datatype-GetOffset">H5Tget_offset</a>
<li><a href="#Datatype-GetOrder">H5Tget_order</a>
<li><a href="#Datatype-GetOverflow">H5Tget_overflow</a>
<li><a href="#Datatype-GetPad">H5Tget_pad</a>
<li><a href="#Datatype-GetPrecision">H5Tget_precision</a>
<li><a href="#Datatype-GetSign">H5Tget_sign</a>
<li><a href="#Datatype-GetSize">H5Tget_size</a>
<li><a href="#Datatype-GetStrpad">H5Tget_strpad</a>
<li><a href="#Datatype-GetSuper">H5Tget_super</a>
<li><a href="#Datatype-GetTag">H5Tget_tag</a>
<li><a href="#Datatype-Insert">H5Tinsert</a>
<li><a href="#Datatype-IsVariableString">H5Tis_variable_str</a>
</td>
<td width=3%> </td>
<td valign="top">
<li><a href="#Datatype-Lock">H5Tlock</a>
<li><a href="#Datatype-Open">H5Topen</a>
<li><a href="#Datatype-Pack">H5Tpack</a>
<li><a href="#Datatype-Register">H5Tregister</a>
<li><a href="#Datatype-SetCset">H5Tset_cset</a>
<li><a href="#Datatype-SetEbias">H5Tset_ebias</a>
<li><a href="#Datatype-SetFields">H5Tset_fields</a>
<li><a href="#Datatype-SetInpad">H5Tset_inpad</a>
<li><a href="#Datatype-SetNorm">H5Tset_norm</a>
<li><a href="#Datatype-SetOffset">H5Tset_offset</a>
<li><a href="#Datatype-SetOrder">H5Tset_order</a>
<li><a href="#Datatype-SetOverflow">H5Tset_overflow</a>
<li><a href="#Datatype-SetPad">H5Tset_pad</a>
<li><a href="#Datatype-SetPrecision">H5Tset_precision</a>
<li><a href="#Datatype-SetSign">H5Tset_sign</a>
<li><a href="#Datatype-SetSize">H5Tset_size</a>
<li><a href="#Datatype-SetStrpad">H5Tset_strpad</a>
<li><a href="#Datatype-SetTag">H5Tset_tag</a>
<li><a href="#Datatype-Unregister">H5Tunregister</a>
<li><a href="#Datatype-VLCreate">H5Tvlen_create</a>
</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 width=32%>
<i>General Datatype Operations</i>
<li><a href="#Datatype-Create">h5tcreate_f</a>
<li><a href="#Datatype-Open">h5topen_f</a>
<li><a href="#Datatype-Commit">h5tcommit_f</a>
<li><a href="#Datatype-Committed">h5tcommitted_f</a>
<li><a href="#Datatype-Copy">h5tcopy_f</a>
<li><a href="#Datatype-Equal">h5tequal_f</a>
<!--<li><a href="#Datatype-Lock">h5tlock_f</a> -->
<li><a href="#Datatype-GetClass">h5tget_class_f</a>
<li><a href="#Datatype-GetSize">h5tget_size_f</a>
<li><a href="#Datatype-GetSuper">h5tget_super_f</a>
<!--<li><a href="#Datatype-GetNativeType">h5tget_native_type_f</a> -->
<!--<li><a href="#Datatype-DetectClass">h5tdetect_class_f</a> -->
<li><a href="#Datatype-Close">h5tclose_f</a>
<!--<p> -->
<!--<i>Conversion Functions</i> -->
<!--<li><a href="#Datatype-Convert">h5tconvert_f</a> -->
<!--<li><a href="#Datatype-Find">h5tfind_f</a> -->
<!--<li><a href="#Datatype-SetOverflow">h5tset_overflow_f</a> -->
<!--<li><a href="#Datatype-GetOverflow">h5tget_overflow_f</a> -->
<!--<li><a href="#Datatype-Register">h5tregister_f</a> -->
<!--<li><a href="#Datatype-Unregister">h5tunregister_f</a> -->
<p>
<i>Atomic Datatype Properties</i>
<li><a href="#Datatype-SetSize">h5tset_size_f</a>
<li><a href="#Datatype-GetOrder">h5tget_order_f</a>
<li><a href="#Datatype-SetOrder">h5tset_order_f</a>
<li><a href="#Datatype-GetPrecision">h5tget_precision_f</a>
<li><a href="#Datatype-SetPrecision">h5tset_precision_f</a>
<li><a href="#Datatype-GetOffset">h5tget_offset_f</a>
<li><a href="#Datatype-SetOffset">h5tset_offset_f</a>
</td><td> </td><td valign=top width=32%>
<i>Atomic (continued)</i>
<!-- <table><tr><td valign=top> -->
<li><a href="#Datatype-GetPad">h5tget_pad_f</a>
<li><a href="#Datatype-SetPad">h5tset_pad_f</a>
<li><a href="#Datatype-GetSign">h5tget_sign_f</a>
<li><a href="#Datatype-SetSign">h5tset_sign_f</a>
<li><a href="#Datatype-GetFields">h5tget_fields_f</a>
<li><a href="#Datatype-SetFields">h5tset_fields_f</a>
<li><a href="#Datatype-GetEbias">h5tget_ebiass_f</a>
<li><a href="#Datatype-SetEbias">h5tset_ebiass_f</a>
<!-- </td><td valign=top> -->
<li><a href="#Datatype-GetNorm">h5tget_norm_f</a>
<li><a href="#Datatype-SetNorm">h5tset_norm_f</a>
<li><a href="#Datatype-GetInpad">h5tget_inpad_f</a>
<li><a href="#Datatype-SetInpad">h5tset_inpad_f</a>
<li><a href="#Datatype-GetCset">h5tget_cset_f</a>
<li><a href="#Datatype-SetCset">h5tset_cset_f</a>
<li><a href="#Datatype-GetStrpad">h5tget_strpad_f</a>
<li><a href="#Datatype-SetStrpad">h5tset_strpad_f</a>
<!-- </td></tr></table> -->
<p>
<i>Array Datatypes</i>
<li><a href="#Datatype-ArrayCreate">h5tarray_create_f</a>
<li><a href="#Datatype-GetArrayNdims">h5tget_array_ndims_f</a>
<li><a href="#Datatype-GetArrayDims">h5tget_array_dims_f</a>
<!--<p> -->
<!--<i>Variable-length Datatypes</i> -->
<!--<li><a href="#Datatype-VLCreate">h5tvlen_create_f</a> -->
</td><td> </td><td valign=top width=32%>
<i>Compound Datatype Properties</i>
<li><a href="#Datatype-GetNmembers">h5tget_nmembers_f</a>
<!--<li><a href="#Datatype-GetMemberClass">h5tget_member_class_f</a> -->
<li><a href="#Datatype-GetMemberName">h5tget_member_name_f</a>
<!--<li><a href="#Datatype-GetMemberIndex">h5tget_member_index_f</a> -->
<li><a href="#Datatype-GetMemberOffset">h5tget_member_offset_f</a>
<!--<li><a href="#Datatype-GetMemberDims">h5tget_member_dims_f</a> -->
<li><a href="#Datatype-GetMemberType">h5tget_member_type_f</a>
<li><a href="#Datatype-Insert">h5tinsert_f</a>
<li><a href="#Datatype-Pack">h5tpack_f</a>
<!--<li><a href="#Datatype-InsertArray">h5tinsert_array_f</a> -->
<p>
<i>Enumeration Datatypes</i>
<li><a href="#Datatype-EnumCreate">h5tenum_create_f</a>
<li><a href="#Datatype-EnumInsert">h5tenum_insert_f</a>
<li><a href="#Datatype-EnumNameOf">h5tenum_nameof_f</a>
<li><a href="#Datatype-EnumValueOf">h5tenum_valueof_f</a>
<li><a href="#Datatype-GetMemberValue">h5tget_member_value_f</a>
<li><a href="#Datatype-GetNmembers">h5tget_nmembers_f</a>
<li><a href="#Datatype-GetMemberName">h5tget_member_name_f</a>
<!--<li><a href="#Datatype-GetMemberIndex">h5tget_member_index_f</a> -->
<p>
<i>Variable-length Datatypes</i>
<li><a href="#Datatype-VLCreate">h5tvlen_create_f</a>
<li><a href="#Datatype-IsVariableString">h5tis_variable_str_f</a>
<p>
<i>Opaque Datatypes</i>
<li><a href="#Datatype-SetTag">h5tset_tag_f</a>
<li><a href="#Datatype-GetTag">h5tget_tag_f</a>
</td></tr>
</table>
<p>
The Datatype interface, H5T, provides a mechanism to describe the
storage format of individual data points of a data set and is
hopefully designed in such a way as to allow new features to be
easily added without disrupting applications that use the data
type interface. A dataset (the H5D interface) is composed of a
collection or raw data points of homogeneous type organized
according to the data space (the H5S interface).
<p>
A datatype is a collection of datatype properties, all of
which can be stored on disk, and which when taken as a whole,
provide complete information for data conversion to or from that
datatype. The interface provides functions to set and query
properties of a datatype.
<p>
A <em>data point</em> is an instance of a <em>datatype</em>,
which is an instance of a <em>type class</em>. We have defined
a set of type classes and properties which can be extended at a
later time. The atomic type classes are those which describe
types which cannot be decomposed at the datatype interface
level; all other classes are compound.
<p>
See <a href="Datatypes.html"><cite>The Datatype Interface (H5T)</cite></a>
in the <cite>HDF5 User's Guide</cite> for further information, including a complete list of all supported datatypes.
<!-- NEW PAGE -->
<!-- HEADER RIGHT " " -->
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tarray_create" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-ArrayCreate">H5Tarray_create</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t</em> <code>H5Tarray_create</code>(
<em>hid_t</em> <code>base</code>,
<em>int</em> <code>rank</code>,
<em>const hsize_t</em> <code>dims[/*rank*/]</code>,
<em>const int</em> <code>perm[/*rank*/]</code>
)
<dt><strong>Purpose:</strong>
<dd>Creates an array datatype object.
<dt><strong>Description:</strong>
<dd><code>H5Tarray_create</code> creates a new array datatype object.
<p>
<code>base</code> is the datatype of every element of the array,
i.e., of the number at each position in the array.
<p>
<code>rank</code> is the number of dimensions and the
size of each dimension is specified in the array <code>dims</code>.
The value of <code>rank</code> is currently limited to
<code>H5S_MAX_RANK</code> and must be greater than <code>0</code>
(zero).
All dimension sizes specified in <code>dims</code> must be greater
than <code>0</code> (zero).
<p>
The array <code>perm</code> is designed to contain the dimension
permutation, i.e. C versus FORTRAN array order.
<b><i>(The parameter </i><code>perm</code><i> is currently unused and is not yet implemented.)</i></b>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>base</code></td>
<td valign="top">IN: Datatype identifier for the array base datatype.</td></tr>
<tr>
<td valign="top"><em>int</em> <code>rank</code></td>
<td valign="top">IN: Rank of the array.</td></tr>
<tr>
<td valign="top"><em>const hsize_t</em> <code>dims[/*rank*/] </code></td>
<td valign="top">IN: Size of each array dimension.</td></tr>
<tr>
<td valign="top"><em>const int</em> <code>perm[/*rank*/]</code></td>
<td valign="top">IN: Dimension permutation.
<b><i>(Currently not implemented.)</i></b></td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tarray_create_f
<dd>
<pre>
SUBROUTINE h5tarray_create_f(base_id, rank, dims, type_id, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: base_id ! Identifier of array base datatype
INTEGER, INTENT(IN) :: rank ! Rank of the array
INTEGER(HSIZE_T), DIMENSION(*), INTENT(IN) :: dims
! Sizes of each array dimension
INTEGER(HID_T), INTENT(OUT) :: type_id ! Identifier of the array datatype
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tarray_create_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 "H5Tclose" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-Close">H5Tclose</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tclose</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Releases a datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tclose</code> releases a datatype. Further access
through the datatype identifier is illegal. Failure to release
a datatype with this call will result in resource leaks.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to release.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tclose_f
<dd>
<pre>
SUBROUTINE h5tclose_f(type_id, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: hdferr ! Error code
! 0 on success and -1 on failure
END SUBROUTINE h5tclose_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 "H5Tcommit" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-Commit">H5Tcommit</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em><code>H5Tcommit</code>(<em>hid_t</em> <code>loc_id</code>,
<em>const char *</em> <code>name</code>,
<em>hid_t</em> <code>type</code>
)
<dt><strong>Purpose:</strong>
<dd>Commits a transient datatype to a file, creating a new named datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tcommit</code> commits a transient datatype
(not immutable) to a file, turned it into a named datatype.
The <code>loc_id</code> is either a file or group identifier
which, when combined with <code>name</code>, refers to a new
named datatype.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>loc_id</code></td>
<td valign="top">IN: A file or group identifier.</td></tr>
<tr>
<td valign="top"><em>const char *</em> <code>name </code></td>
<td valign="top">IN: A datatype name.</td></tr>
<tr>
<td valign="top"><em>hid_t</em> <code>type</code></td>
<td valign="top">IN: A datatype identifier.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tcommit_f
<dd>
<pre>
SUBROUTINE h5tcommit_f(loc_id, name, type_id, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: loc_id ! File or group identifier
CHARACTER(LEN=*), INTENT(IN) :: name ! Datatype name within file or group
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: hdferr ! Error code
! 0 on success and -1 on failure
END SUBROUTINE h5tcommit_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 "H5Tcommitted" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-Committed">H5Tcommitted</a>
<dt><strong>Signature:</strong>
<dd><em>htri_t</em><code>H5Tcommitted</code>(<em>hid_t</em> <code>type</code>)
<dt><strong>Purpose:</strong>
<dd>Determines whether a datatype is a named type or a transient type.
<dt><strong>Description:</strong>
<dd><code>H5Tcommitted</code> queries a type to determine whether
the type specified by the <code>type</code> identifier
is a named type or a transient type. If this function returns
a positive value, then the type is named (that is, it has been
committed, perhaps by some other application). Datasets which
return committed datatypes with <code>H5Dget_type()</code> are
able to share the datatype with other datasets in the same file.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type </code></td>
<td valign="top">IN: Datatype identifier.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>When successful, returns a positive value, for <code>TRUE</code>,
if the datatype has been committed, or <code>0</code> (zero),
for <code>FALSE</code>, if the datatype has not been committed.
Otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tcommitted_f
<dd>
<pre>
SUBROUTINE h5tcommitted_f(type_id, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tcommitted_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 "H5Tconvert" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-Convert">H5Tconvert</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Tconvert</code>(<em>hid_t</em> <code>src_id</code>,
<em>hid_t</em> <code>dst_id</code>,
<em>size_t</em> <code>nelmts</code>,
<em>void *</em><code>buf</code>,
<em>void *</em><code>background</code>,
<em>hid_t</em> <code>plist_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Converts data from between specified datatypes.
<dt><strong>Description:</strong>
<dd><code>H5Tconvert</code> converts <code>nelmts</code> elements
from the type specified by the <code>src_id</code> identifier
to type <code>dst_id</code>.
The source elements are packed in <code>buf</code> and on return
the destination will be packed in <code>buf</code>.
That is, the conversion is performed in place.
The optional background buffer is an array of <code>nelmts</code>
values of destination type which are merged with the converted
values to fill in cracks (for instance, <code>background</code>
might be an array of structs with the <code>a</code> and
<code>b</code> fields already initialized and the conversion
of <code>buf</code> supplies the <code>c</code> and <code>d</code>
field values).
<p>
The parameter <code>plist_id</code> contains the dataset transfer
property list identifier which is passed to the conversion functions.
As of Release 1.2, this parameter is only used to pass along the
variable-length datatype custom allocation information.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>src_id</code></td>
<td valign="top">Identifier for the source datatype.</td></tr>
<tr>
<td valign="top"><em>hid_t</em> <code>dst_id</code></td>
<td valign="top">Identifier for the destination datatype.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>nelmts</code></td>
<td valign="top">Size of array <code>buf</code>.</td></tr>
<tr>
<td valign="top"><em>void *</em><code>buf</code></td>
<td valign="top">Array containing pre- and post-conversion values.</td></tr>
<tr>
<td valign="top"><em>void *</em><code>background </code></td>
<td valign="top">Optional background buffer.</td></tr>
<tr>
<td valign="top"><em>hid_t</em> <code>plist_id</code></td>
<td valign="top">Dataset transfer property list identifier.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
<!--
<pre>
SUBROUTINE
</pre>
-->
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tcopy" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-Copy">H5Tcopy</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t </em><code>H5Tcopy</code>(<em>hid_t </em><code>type_id</code>)
<dt><strong>Purpose:</strong>
<dd>Copies an existing datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tcopy</code> copies an existing datatype.
The returned type is always transient and unlocked.
<p>
The <code>type_id</code> argument can be either a datatype
identifier, a predefined datatype (defined in
<code>H5Tpublic.h</code>), or a dataset identifier.
If <code>type_id</code> is a dataset identifier instead of a
datatype identifier, then this function returns a transient,
modifiable datatype which is a copy of the dataset's datatype.
<p>
The datatype identifier returned should be released with
<code>H5Tclose</code> or resource leaks will occur.
<!--
<p>
Native datatypes supported by the library are:
<ul> <dl>
<dt>H5T_NATIVE_CHAR
<dd> Native character type, declare dataset array as 'char'
<dt>H5T_NATIVE_UCHAR
<dd> Native unsigned character type, declare dataset array as 'unsigned char'
<dt>H5T_NATIVE_SHORT
<dd> Native short type, declare dataset array as 'short'
<dt>H5T_NATIVE_USHORT
<dd> Native unsigned short type, declare dataset array as 'unsigned short'
<dt>H5T_NATIVE_INT
<dd> Native int type, declare dataset array as 'int'
<dt>H5T_NATIVE_UINT
<dd> Native unsigned int type, declare dataset array as 'unsigned int'
<dt>H5T_NATIVE_LONG
<dd> Native long type, declare dataset array as 'unsigned long'
<dt>H5T_NATIVE_ULONG
<dd> Native unsigned long type, declare dataset array as 'unsigned long'
<dt>H5T_NATIVE_LLONG
<dd> Native long long type, declare dataset array as 'unsigned long long'
<dt>H5T_NATIVE_ULLONG
<dd> Native unsigned long long type, declare dataset array as 'unsigned long long'
<dt>H5T_NATIVE_INT8
<dd> Native signed 8-bit type, declare dataset array as 'int8'
<dt>H5T_NATIVE_UINT8
<dd> Native unsigned 8-bit type, declare dataset array as 'uint8'
<dt>H5T_NATIVE_INT16
<dd> Native signed 16-bit type, declare dataset array as 'int16'
<dt>H5T_NATIVE_UINT16
<dd> Native unsigned 16-bit type, declare dataset array as 'uint16'
<dt>H5T_NATIVE_INT32
<dd> Native signed 32-bit type, declare dataset array as 'int32'
<dt>H5T_NATIVE_UINT32
<dd> Native unsigned 32-bit type, declare dataset array as 'uint32'
<dt>H5T_NATIVE_INT64
<dd> Native signed 64-bit type, declare dataset array as 'uint64'
<dt>H5T_NATIVE_UINT64
<dd> Native unsigned 64-bit type, declare dataset array as 'uint64'
<dt>H5T_NATIVE_FLOAT
<dd> Native single-precision float type, declare dataset array as 'float'
<dt>H5T_NATIVE_DOUBLE
<dd> Native double-precision float type, declare dataset array as 'double'
<dt>H5T_NATIVE_HSIZE
<dd> Native size_t type, declare dataset array as 'hsize_t'
<dt>H5T_NATIVE_HSSIZE
<dd> Native signed size_t type, declare dataset array as 'hssize_t'
<dt>H5T_NATIVE_HERR
<dd> Native error type, declare dataset array as 'herr_t'
<dt>H5T_NATIVE_HBOOL
<dd> Native boolean type, declare dataset array as 'hbool_t'
</dl> </ul>
-->
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to copy. Can be a datatype
identifier, a predefined datatype (defined in
<code>H5Tpublic.h</code>), or a dataset identifier.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a datatype identifier if successful;
otherwise returns a negative value
<dt><strong>Fortran90 Interface:</strong> h5tcopy_f
<dd>
<pre>
SUBROUTINE h5tcopy_f(type_id, new_type_id, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER(HID_T), INTENT(OUT) :: new_type_id ! Identifier of datatype's copy
INTEGER, INTENT(OUT) :: hdferr ! Error code
! 0 on success and -1 on failure
END SUBROUTINE h5tcopy_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tcreate" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-Create">H5Tcreate</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t </em><code>H5Tcreate</code>(<em>H5T_class_t </em><code>class</code>,
<em>size_t</em><code>size</code>
)
<dt><strong>Purpose:</strong>
<dd>Creates a new datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tcreate</code> creates a new datatype of the specified
class with the specified number of bytes.
<p>
The following datatype classes are supported with this function:
<ul>
<li><code>H5T_COMPOUND</code>
<li><code>H5T_OPAQUE</code>
<li><code>H5T_ENUM</code>
</ul>
<p>
Use <code>H5Tcopy</code> to create integer or floating-point datatypes.
<p>
The datatype identifier returned from this function should be
released with <code>H5Tclose</code> or resource leaks will result.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>H5T_class_t</em> <code>class </code></td>
<td valign="top">Class of datatype to create.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>size</code></td>
<td valign="top">The number of bytes in the datatype to create.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns datatype identifier if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tcreate_f
<dd>
<pre>
SUBROUTINE h5tcreate_f(class, size, type_id, hdferr)
IMPLICIT NONE
INTEGER, INTENT(IN) :: class ! Datatype class can be one of
! H5T_COMPOUND_F (6)
! H5T_ENUM_F (8)
! H5T_OPAQUE_F (9)
INTEGER(SIZE_T), INTENT(IN) :: size ! Size of the datatype
INTEGER(HID_T), INTENT(OUT) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tcreate_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tdetect_class" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-DetectClass">H5Tdetect_class</a>
<dt><strong>Signature:</strong>
<dd><em>htri_t </em><code>H5Tdetect_class</code>(<em>hid_t</em> <code>dtype_id</code>,
<em>H5T_class_t</em><code>dtype_class</code>
)
<dt><strong>Purpose:</strong>
<dd>Determines whether a datatype contains any datatypes of the
given datatype class.
<dt><strong>Description:</strong>
<dd><code>H5Tdetect_class</code> determines whether the datatype
specified in <code>dtype_id</code> contains any datatypes of the
datatype class specified in <code>dtype_class</code>.
<p>
This function is useful primarily in recursively examining
all the fields and/or base types
of compound, array, and variable-length datatypes.
<p>
Valid class identifiers are as defined in
<a href="#Datatype-GetClass"><code>H5Tget_class</code></a>.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>dtype_id</code></td>
<td valign="top">Datatype identifier.</td></tr>
<tr>
<td valign="top"><em>H5T_class_t</em> <code>dtype_class </code></td>
<td valign="top">Datatype class.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns <code>TRUE</code> or <code>FALSE</code> if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
<!--
<pre>
SUBROUTINE
</pre>
-->
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tenum_create" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-EnumCreate">H5Tenum_create</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t</em> <code>H5Tenum_create</code>(<em>hid_t</em> <code>parent_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Creates a new enumeration datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tenum_create</code> creates a new enumeration datatype
based on the specified base datatype, <code>parent_id</code>,
which must be an integer type.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>parent_id </code></td>
<td valign="top">IN: Datatype identifier for the base datatype.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns the datatype identifier for the new enumeration datatype if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tenum_create_f
<dd>
<pre>
SUBROUTINE h5tenum_create_f(parent_id, new_type_id, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: parent_id ! Datatype identifier for
! the base datatype
INTEGER(HID_T), INTENT(OUT) :: new_type_id ! Datatype identifier for the
! new enumeration datatype
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tenum_create_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tenum_insert" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-EnumInsert">H5Tenum_insert</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Tenum_insert</code>(<em>hid_t</em> <code>type</code>,
<em>const char</em> *<code>name</code>,
<em>void</em> *<code>value</code>
)
<dt><strong>Purpose:</strong>
<dd>Inserts a new enumeration datatype member.
<dt><strong>Description:</strong>
<dd><code>H5Tenum_insert</code> inserts a
new enumeration datatype member into an enumeration datatype.
<p>
<code>type</code> is the enumeration datatype,
<code>name</code> is the name of the new member, and
<code>value</code> points to the value of the new member.
<p>
<code>name</code> and <code>value</code> must both
be unique within <code>type</code>.
<p>
<code>value</code> points to data which is of the
datatype defined when the enumeration datatype was created.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type</code></td>
<td valign="top">IN: Datatype identifier for the enumeration datatype.</td></tr>
<tr>
<td valign="top"><em>const char</em> *<code>name </code></td>
<td valign="top">IN: Name of the new member.</td></tr>
<tr>
<td valign="top"><em>void</em> *<code>value</code></td>
<td valign="top">IN: Pointer to the value of the new member.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tenum_insert_f
<dd>
<pre>
SUBROUTINE h5tenum_insert_f(type_id, name, value, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
CHARACTER(LEN=*), INTENT(IN) :: name ! Name of the new member
INTEGER, INTENT(IN) :: value ! Value of the new member
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tenum_insert_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tenum_nameof" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-EnumNameOf">H5Tenum_nameof</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Tenum_nameof</code>(<em>hid_t</em> <code>type</code>
<em>void</em> *<code>value</code>,
<em>char</em> *<code>name</code>,
<em>size_t</em> <code>size</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns the symbol name corresponding to a specified member of an enumeration datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tenum_nameof</code> finds the symbol name that
corresponds to the specified <code>value</code>
of the enumeration datatype <code>type</code>.
<p>
At most <code>size</code> characters of the symbol
name are copied into the <code>name</code> buffer.
If the entire symbol name and null terminator
do not fit in the <code>name</code> buffer, then as
many characters as possible are copied
(not null terminated) and the function fails.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type</code></td>
<td valign="top">IN: Enumeration datatype identifier.</td></tr>
<tr>
<td valign="top"><em>void</em> *<code>value, </code></td>
<td valign="top">IN: Value of the enumeration datatype.</td></tr>
<tr>
<td valign="top"><em>char</em> *<code>name</code>,</td>
<td valign="top">OUT: Buffer for output of the symbol name.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>size</code></td>
<td valign="top">IN: Anticipated size of the symbol name, in bytes (characters).</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful.
Otherwise returns a negative value
and, if <code>size</code> allows it,
the first character of <code>name</code> is
set to <code>NULL</code>.
<dt><strong>Fortran90 Interface:</strong> h5tenum_nameof_f
<dd>
<pre>
SUBROUTINE h5tenum_nameof_f(type_id, name, namelen, value, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
CHARACTER(LEN=*), INTENT(OUT) :: name ! Name of the enumeration datatype
INTEGER(SIZE_T), INTENT(IN) :: namelen ! Length of the name
INTEGER, INTENT(IN) :: value ! Value of the enumeration datatype
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tenum_nameof_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 "H5Tenum_valueof" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-EnumValueOf">H5Tenum_valueof</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Tenum_valueof</code>(<em>hid_t</em> <code>type</code>
<em>char</em> *<code>name</code>,
<em>void</em> *<code>value</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns the value corresponding to a specified member of an enumeration datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tenum_valueof</code> finds the value that
corresponds to the specified <code>name</code>
of the enumeration datatype <code>type</code>.
<p>
The <code>value</code> argument should be at least
as large as the value of <code>H5Tget_size(type)</code>
in order to hold the result.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type</code></td>
<td valign="top">IN: Enumeration datatype identifier.</td></tr>
<tr>
<td valign="top"><em>const char</em> *<code>name, </code></td>
<td valign="top">IN: Symbol name of the enumeration datatype.</td></tr>
<tr>
<td valign="top"><em>void</em> *<code>value</code>,</td>
<td valign="top">OUT: Buffer for output of the value of the enumeration datatype.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tenum_valueof_f
<dd>
<pre>
SUBROUTINE h5tenum_valueof_f(type_id, name, value, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
CHARACTER(LEN=*), INTENT(IN) :: name ! Name of the enumeration datatype
INTEGER, INTENT(OUT) :: value ! Value of the enumeration datatype
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tenum_valueof_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 "H5Tequal" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-Equal">H5Tequal</a>
<dt><strong>Signature:</strong>
<dd><em>htri_t </em><code>H5Tequal</code>(<em>hid_t </em><code>type_id1</code>,
<em>hid_t</em><code>type_id2</code>
)
<dt><strong>Purpose:</strong>
<dd>Determines whether two datatype identifiers refer to the same datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tequal</code> determines whether two datatype identifiers
refer to the same datatype.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id1 </code></td>
<td valign="top">Identifier of datatype to compare.</td></tr>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id2</code></td>
<td valign="top">Identifier of datatype to compare.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>When successful, returns a positive value, for <code>TRUE</code>,
if the datatype identifiers refer to the same datatype,
or <code>0</code> (zero), for <code>FALSE</code>.
Otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tequal_f
<dd>
<pre>
SUBROUTINE h5tequal_f(type1_id, type2_id, flag, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type1_id ! Datatype identifier
INTEGER(HID_T), INTENT(IN) :: type2_id ! Datatype identifier
LOGICAL, INTENT(OUT) :: flag ! TRUE/FALSE flag to indicate
! if two datatypes are equal
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tequal_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 "H5Tfind" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-Find">H5Tfind</a>
<dt><strong>Signature:</strong>
<dd><em>H5T_conv_t</em> <code>H5Tfind</code>(<em>hid_t</em> <code>src_id</code>,
<em>hid_t</em> <code>dst_id</code>,
<em>H5T_cdata_t **</em><code>pcdata</code>
)
<dt><strong>Purpose:</strong>
<dd>Finds a conversion function.
<dt><strong>Description:</strong>
<dd><code>H5Tfind</code> finds a conversion function that can
handle a conversion from type <code>src_id</code> to type
<code>dst_id</code>.
The <code>pcdata</code> argument is a pointer to a pointer
to type conversion data which was created and initialized
by the soft type conversion function of this path when the
conversion function was installed on the path.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>src_id</code></td>
<td valign="top">IN: Identifier for the source datatype.</td></tr>
<tr>
<td valign="top"><em>hid_t</em> <code>dst_id</code></td>
<td valign="top">IN: Identifier for the destination datatype.</td></tr>
<tr>
<td valign="top"><em>H5T_cdata_t **</em><code>pcdata </code></td>
<td valign="top">OUT: Pointer to type conversion data.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a pointer to a suitable conversion function if successful.
Otherwise returns NULL.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
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SUBROUTINE
</pre>
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetArrayDims">H5Tget_array_dims</a>
<dt><strong>Signature:</strong>
<dd><em>int</em> <code>H5Tget_array_dims</code>(
<em>hid_t</em> <code>adtype_id</code>,
<em>hsize_t *</em><code>dims[]</code>,
<em>int *</em><code>perm[]</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves sizes of array dimensions and dimension permutations.
<dt><strong>Description:</strong>
<dd><code>H5Tget_array_dims</code> returns the sizes of the dimensions
and the dimension permutations of the specified array datatype object.
<p>
The sizes of the dimensions are returned in the array <code>dims</code>.
The dimension permutations, i.e., C versus FORTRAN array order,
are returned in the array <code>perm</code>.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>adtype_id </code></td>
<td valign="top">IN: Datatype identifier of array object.</td></tr>
<tr>
<td valign="top"><em>hsize_t *</em><code>dims[]</code></td>
<td valign="top">OUT: Sizes of array dimensions.</td></tr>
<tr>
<td valign="top"><em>int *</em><code>perm[]</code></td>
<td valign="top">OUT: Dimension permutations.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns the non-negative number of dimensions of the array type if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tget_array_dims_f
<dd>
<pre>
SUBROUTINE h5tget_array_dims_f(type_id, dims, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Identifier of the array datatype
INTEGER(HSIZE_T), DIMENSION(*), INTENT(OUT) :: dims
! Buffer to store array datatype
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_array_dims_f
</pre>
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetArrayNdims">H5Tget_array_ndims</a>
<dt><strong>Signature:</strong>
<dd><em>int</em> <code>H5Tget_array_ndims</code>(
<em>hid_t</em> <code>adtype_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns the rank of an array datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tget_array_ndims</code> returns the rank,
the number of dimensions, of an array datatype object.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>adtype_id </code></td>
<td valign="top">IN: Datatype identifier of array object.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns the rank of the array if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tget_array_ndims_f
<dd>
<pre>
SUBROUTINE h5tget_array_ndims_f(type_id, ndims, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Identifier of the array datatype
INTEGER, INTENT(OUT) :: ndims ! Number of array dimensions
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_array_ndims_f
</pre>
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetClass">H5Tget_class</a>
<dt><strong>Signature:</strong>
<dd><em>H5T_class_t </em><code>H5Tget_class</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns the datatype class identifier.
<dt><strong>Description:</strong>
<dd><code>H5Tget_class</code> returns the datatype class identifier.
<p>
Valid class identifiers, as defined in <code>H5Tpublic.h</code>, are:
<ul><li><code>H5T_INTEGER</code>
<li><code>H5T_FLOAT</code>
<li><code>H5T_TIME</code>
<li><code>H5T_STRING</code>
<li><code>H5T_BITFIELD</code>
<li><code>H5T_OPAQUE</code>
<li><code>H5T_COMPOUND</code>
<li><code>H5T_REFERENCE</code>
<li><code>H5T_ENUM</code>
<li><code>H5T_VLEN</code>
<li><code>H5T_ARRAY</code>
</ul>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns datatype class identifier if successful;
otherwise <code>H5T_NO_CLASS</code> (-1).
<dt><strong>Fortran90 Interface:</strong> h5tget_class_f
<dd>
<pre>
SUBROUTINE h5tget_class_f(type_id, class, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: class ! Datatype class, possible values are:
! H5T_NO_CLASS_F
! H5T_INTEGER_F
! H5T_FLOAT_F
! H5T_TIME_F
! H5T_STRING_F
! H5T_BITFIELD_F
! H5T_OPAQUE_F
! H5T_COMPOUND_F
! H5T_REFERENCE_F
! H5T_ENUM_F
INTEGER, INTENT(OUT) :: hdferr ! Error code
! 0 on success and -1 on failure
END SUBROUTINE h5tget_class_f
</pre>
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetCset">H5Tget_cset</a>
<dt><strong>Signature:</strong>
<dd><em>H5T_cset_t </em><code>H5Tget_cset</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves the character set type of a string datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tget_cset</code> retrieves the character set type
of a string datatype. Valid character set types are:
<dl><ul>
<dt>H5T_CSET_ASCII (<code>0</code>)
<dd>Character set is US ASCII
</ul></dl>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a valid character set type if successful;
otherwise <code>H5T_CSET_ERROR</code> (-1).
<dt><strong>Fortran90 Interface:</strong> h5tget_cset_f
<dd>
<pre>
SUBROUTINE h5tget_cset_f(type_id, cset, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: cset ! Character set type of a string
! datatype
! Possible values of padding type are:
! H5T_CSET_ASCII_F = 0
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_cset_f
</pre>
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetEbias">H5Tget_ebias</a>
<dt><strong>Signature:</strong>
<dd><em>size_t </em><code>H5Tget_ebias</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves the exponent bias of a floating-point type.
<dt><strong>Description:</strong>
<dd><code>H5Tget_ebias</code> retrieves the exponent bias of a floating-point type.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns the bias if successful;
otherwise 0.
<dt><strong>Fortran90 Interface:</strong> h5tget_ebias_f
<dd>
<pre>
SUBROUTINE h5tget_ebias_f(type_id, ebias, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: ebias ! Datatype exponent bias
! of a floating-point type
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_ebias_f
</pre>
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<dd>
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetFields">H5Tget_fields</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tget_fields</code>(<em>hid_t </em><code>type_id</code>,
<em>size_t *</em><code>spos</code>,
<em>size_t *</em><code>epos</code>,
<em>size_t *</em><code>esize</code>,
<em>size_t *</em><code>mpos</code>,
<em>size_t *</em><code>msize</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves floating point datatype bit field information.
<dt><strong>Description:</strong>
<dd><code>H5Tget_fields</code> retrieves information about the locations of the various
bit fields of a floating point datatype. The field positions are bit
positions in the significant region of the datatype. Bits are
numbered with the least significant bit number zero.
Any (or even all) of the arguments can be null pointers.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">IN: Identifier of datatype to query.</td></tr>
<tr>
<td valign="top"><em>size_t *</em><code>spos</code></td>
<td valign="top">OUT: Pointer to location to return floating-point sign bit.</td></tr>
<tr>
<td valign="top"><em>size_t *</em><code>epos</code></td>
<td valign="top">OUT: Pointer to location to return exponent bit-position.</td></tr>
<tr>
<td valign="top"><em>size_t *</em><code>esize</code></td>
<td valign="top">OUT: Pointer to location to return size of exponent in bits.</td></tr>
<tr>
<td valign="top"><em>size_t *</em><code>mpos</code></td>
<td valign="top">OUT: Pointer to location to return mantissa bit-position.</td></tr>
<tr>
<td valign="top"><em>size_t *</em><code>msize</code></td>
<td valign="top">OUT: Pointer to location to return size of mantissa in bits.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tget_fields_f
<dd>
<pre>
SUBROUTINE h5tget_fields_f(type_id, epos, esize, mpos, msize, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: epos ! Exponent bit-position
INTEGER, INTENT(OUT) :: esize ! Size of exponent in bits
INTEGER, INTENT(OUT) :: mpos ! Mantissa bit-position
INTEGER, INTENT(OUT) :: msize ! Size of mantissa in bits
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_fields_f
</pre>
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-->
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetInpad">H5Tget_inpad</a>
<dt><strong>Signature:</strong>
<dd><em>H5T_pad_t </em><code>H5Tget_inpad</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves the internal padding type for unused bits in floating-point datatypes.
<dt><strong>Description:</strong>
<dd><code>H5Tget_inpad</code> retrieves the internal padding type for
unused bits in floating-point datatypes.
Valid padding types are:
<ul> <dl>
<dt>H5T_PAD_ZERO (<code>0</code>)
<dd>Set background to zeros.
<dt>H5T_PAD_ONE (<code>1</code>)
<dd>Set background to ones.
<dt>H5T_PAD_BACKGROUND (<code>2</code>)
<dd>Leave background alone.
</dl> </ul>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a valid padding type if successful;
otherwise <code>H5T_PAD_ERROR</code> (-1).
<dt><strong>Fortran90 Interface:</strong> h5tget_inpad_f
<dd>
<pre>
SUBROUTINE h5tget_inpad_f(type_id, padtype, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: padtype ! Padding type for unused bits
! in floating-point datatypes
! Possible values of padding type are:
! H5T_PAD_ZERO_F = 0
! H5T_PAD_ONE_F = 1
! H5T_PAD_BACKGROUND_F = 2
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_inpad_f
</pre>
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<dd>
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<!-- HEADER RIGHT "H5Tget_member_class" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetMemberClass">H5Tget_member_class</a>
<dt><strong>Signature:</strong>
<dd><em>H5T_class_t</em> <code>H5Tget_member_class</code>(
<em>hid_t</em> <code>cdtype_id</code>,
<em>unsigned </em><code>member_no</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns datatype class of compound datatype member.
<dt><strong>Description:</strong>
<dd>Given a compound datatype, <code>cdtype_id</code>, the function
<code>H5Tget_member_class</code> returns the datatype class of
the compound datatype member specified by <code>member_no</code>.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>cdtype_id </code></td>
<td valign="top">IN: Datatype identifier of compound object.</td></tr>
<tr>
<td valign="top"><em>unsigned</em> <code>member_no</code></td>
<td valign="top">IN: Compound object member number.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns the datatype class, a non-negative value, if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetMemberIndex">H5Tget_member_index</a>
<dt><strong>Signature:</strong>
<dd><em>int</em> <code>H5Tget_member_index</code>(<em>hid_t </em><code>type_id</code>,
<em>const char *</em> <code>field_name</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves the index of a compound or enumeration datatype member.
<dt><strong>Description:</strong>
<dd><code>H5Tget_member_index</code> retrieves the index of a field
of a compound datatype or an element of an enumeration datatype.
<p>
The name of the target field or element is specified in
<code>field_name</code>.
<p>
Fields are stored in no particular order
with index values of 0 through <em>N</em>-1, where <em>N</em> is
the value returned by <code>H5Tget_nmembers</code>.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id</code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
<tr>
<td valign="top"><em>const char *</em> <code>field_name </code></td>
<td valign="top">Name of the field or member whose index is to be retrieved.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a valid field or member index if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetMemberName">H5Tget_member_name</a>
<dt><strong>Signature:</strong>
<dd><em>char *</em> <code>H5Tget_member_name</code>(<em>hid_t </em><code>type_id</code>,
<em>unsigned</em> <code>field_idx</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves the name of a compound or enumeration datatype member.
<dt><strong>Description:</strong>
<dd><code>H5Tget_member_name</code> retrieves the name of a field
of a compound datatype or an element of an enumeration datatype.
<p>
The index of the target field or element is specified in
<code>field_idx</code>.
Compound datatype fields and enumeration datatype elements
are stored in no particular order
with index values of 0 through <em>N</em>-1, where <em>N</em>
is the value returned by <code>H5Tget_nmembers</code>.
<p>
A buffer to receive the name of the field is
allocated with <code>malloc()</code> and the caller is responsible
for freeing the memory used.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
<tr>
<td valign="top"><em>unsigned</em> <code>field_idx</code></td>
<td valign="top">Zero-based index of the field or element whose name
is to be retrieved.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a valid pointer to a string allocated with
<code>malloc()</code> if successful;
otherwise returns NULL.
<dt><strong>Fortran90 Interface:</strong> h5tget_member_name_f
<dd>
<pre>
SUBROUTINE h5tget_member_name_f(type_id,index, member_name, namelen, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(IN) :: index ! Field index (0-based) of
! the field name to retrieve
CHARACTER(LEN=*), INTENT(OUT) :: member_name ! Name of a field of
! a compound datatype
INTEGER, INTENT(OUT) :: namelen ! Length of the name
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_member_name_f
</pre>
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-->
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<!-- HEADER RIGHT "H5Tget_member_offset" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetMemberOffset">H5Tget_member_offset</a>
<dt><strong>Signature:</strong>
<dd><em>size_t</em> <code>H5Tget_member_offset</code>(<em>hid_t </em><code>type_id</code>,
<em>unsigned</em> <code>memb_no</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves the offset of a field of a compound datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tget_member_offset</code> retrieves the
byte offset of the beginning of a field within a
compound datatype with respect to the beginning
of the compound data type datum.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
<tr>
<td valign="top"><em>unsigned</em> <code>memb_no</code></td>
<td valign="top">Number of the field whose offset is requested.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns the byte offset of the field if successful;
otherwise returns <code>0</code> (zero).
Note that zero is a valid offset and that this function
will fail only if a call to <code>H5Tget_member_class()</code>
fails with the same arguments.
<dt><strong>Fortran90 Interface:</strong> h5tget_member_offset_f
<dd>
<pre>
SUBROUTINE h5tget_member_offset_f(type_id, member_no, offset, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(IN) :: member_no ! Number of the field
! whose offset is requested
INTEGER(SIZE_T), INTENT(OUT) :: offset ! Byte offset of the the
! beginning of the field
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_member_offset_f
</pre>
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-->
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<!-- HEADER RIGHT "H5Tget_member_type" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetMemberType">H5Tget_member_type</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t</em> <code>H5Tget_member_type</code>(<em>hid_t </em><code>type_id</code>,
<em>unsigned</em> <code>field_idx</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns the datatype of the specified member.
<dt><strong>Description:</strong>
<dd><code>H5Tget_member_type</code> returns the datatype of the specified member. The caller
should invoke H5Tclose() to release resources associated with the type.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
<tr>
<td valign="top"><em>unsigned</em> <code>field_idx</code></td>
<td valign="top">Field index (0-based) of the field type to retrieve.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns the identifier of a copy of the datatype of the field
if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tget_member_type_f
<dd>
<pre>
SUBROUTINE h5tget_member_type_f(type_id, field_idx, datatype, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(IN) :: field_idx ! Field index (0-based) of the
! field type to retrieve
INTEGER(HID_T), INTENT(OUT) :: datatype ! Identifier of a copy of
! the datatype of the field
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_member_type_f
</pre>
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<dd>
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<img src="Graphics/C++.gif">
-->
</dl>
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<!-- HEADER RIGHT "H5Tget_member_value" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetMemberValue">H5Tget_member_value</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t</em> <code>H5Tget_member_value</code>(<em>hid_t</em> <code>type</code>
<em>unsigned</em> <code>memb_no</code>,
<em>void</em> *<code>value</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns the value of an enumeration datatype member.
<dt><strong>Description:</strong>
<dd><code>H5Tget_member_value</code> returns the value of
the enumeration datatype member <code>memb_no</code>.
<p>
The member value is returned in a user-supplied buffer
pointed to by <code>value</code>.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type</code></td>
<td valign="top">IN: Datatype identifier for the enumeration datatype.</td></tr>
<tr>
<td valign="top"><em>unsigned</em> <code>memb_no</code>,</td>
<td valign="top">IN: Number of the enumeration datatype member.</td></tr>
<tr>
<td valign="top"><em>void</em> *<code>value </code></td>
<td valign="top">OUT: Pointer to a buffer for output of the
value of the enumeration datatype member.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tget_member_value_f
<dd>
<pre>
SUBROUTINE h5tget_member_value_f(type_id, member_no, value, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(IN) :: member_no ! Number of the enumeration
! datatype member
INTEGER, INTENT(OUT) :: value ! Value of the enumeration datatype
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_member_value_f
</pre>
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<dd>
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-->
</dl>
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<!-- HEADER RIGHT "H5Tget_native_type" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetNativeType">H5Tget_native_type</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t</em> <code>H5Tget_native_type</code>(<em>hid_t</em> <code>type_id</code>,
<em>H5T_direction_t</em> <code>direction</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns the native datatype of a specified datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tget_native_type</code> returns the equivalent native datatype
for the datatype specified in <code>type_id</code>.
<p>
<code>H5Tget_native_type</code> is a high-level function designed
primarily to facilitate use of the <code>H5Dread</code> function,
for which users otherwise must undertake a multi-step process to
determine the native datatype of a dataset prior to reading it
into memory.
It can be used not only to determine
the native datatype for atomic datatypes,
but also to determine the native datatypes of the individual components of
a compound datatype, an enumerated datatype, an array datatype, or
a variable-length datatype.
<p>
<code>H5Tget_native_type</code> selects the matching native datatype
from the following list:
<pre> H5T_NATIVE_CHAR
H5T_NATIVE_SHORT
H5T_NATIVE_INT
H5T_NATIVE_LONG
H5T_NATIVE_LLONG
H5T_NATIVE_UCHAR
H5T_NATIVE_USHORT
H5T_NATIVE_UINT
H5T_NATIVE_ULONG
H5T_NATIVE_ULLONG
H5T_NATIVE_FLOAT
H5T_NATIVE_DOUBLE
H5T_NATIVE_LDOUBLE</pre>
<p>
The <code>direction</code> parameter indicates the order
in which the library searches for a native datatype match.
Valid values for <code>direction</code> are as follows:
<table border=0>
<tr valign=top><td> </td><td>
<code>H5T_DIR_ASCEND</code></td><td>
Searches the above list in ascending size of the datatype,<br>
i.e., from top to bottom. (Default)
</td></tr>
<tr valign=top><td> </td><td>
<code>H5T_DIR_DESCEND</code> </td><td>
Searches the above list in descending size of the datatype,<br>
i.e., from bottom to top.
</td></tr>
</table>
<p>
<code>H5Tget_native_type</code> is designed primarily for
use with intenger and floating point datatypes.
Time, bifield, opaque, and reference datatypes are returned
as a copy of <code>type_id</code>.
<p>
The identifier returned by <code>H5Tget_native_type</code>
should eventually be closed by calling <code>H5Tclose</code>
to release resources.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id</code></td>
<td valign="top">Datatype identifier for the dataset datatype.</td></tr>
<tr>
<td valign="top"><em>H5T_direction_t</em> <code>direction </code></td>
<td valign="top">Direction of search.</td></tr>
</table></ul>
<!-- NEW PAGE -->
<dt><strong>Returns:</strong>
<dd>Returns the native datatype identifier for the
specified dataset datatype if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
<!--
<pre>
SUBROUTINE
</pre>
-->
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tget_nmembers" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetNmembers">H5Tget_nmembers</a>
<dt><strong>Signature:</strong>
<dd><em>int </em><code>H5Tget_nmembers</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves the number of elements in a compound or enumeration datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tget_nmembers</code> retrieves
the number of fields in a compound datatype or
the number of members of an enumeration datatype.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns the number of elements if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tget_nmembers_f
<dd>
<pre>
SUBROUTINE h5tget_nmembers_f(type_id, num_members, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: num_members ! Number of fields in a
! compound datatype
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_nmembers_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tget_norm" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetNorm">H5Tget_norm</a>
<dt><strong>Signature:</strong>
<dd><em>H5T_norm_t </em><code>H5Tget_norm</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves mantissa normalization of a floating-point datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tget_norm</code> retrieves the mantissa normalization of
a floating-point datatype. Valid normalization types are:
<ul> <dl>
<dt>H5T_NORM_IMPLIED (<code>0</code>)
<dd>MSB of mantissa is not stored, always 1
<dt>H5T_NORM_MSBSET (<code>1</code>)
<dd>MSB of mantissa is always 1
<dt>H5T_NORM_NONE (<code>2</code>)
<dd>Mantissa is not normalized
</dl> </ul>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a valid normalization type if successful;
otherwise <code>H5T_NORM_ERROR</code> (-1).
<dt><strong>Fortran90 Interface:</strong> h5tget_norm_f
<dd>
<pre>
SUBROUTINE h5tget_norm_f(type_id, norm, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id
! Datatype identifier
INTEGER, INTENT(OUT) :: norm ! Mantissa normalization of a
! floating-point datatype
! Valid normalization types are:
! H5T_NORM_IMPLIED_F(0)
! MSB of mantissa is not
! stored, always 1
! H5T_NORM_MSBSET_F(1)
! MSB of mantissa is always 1
! H5T_NORM_NONE_F(2)
! Mantissa is not normalized
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_norm_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
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-->
</dl>
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<!-- HEADER RIGHT "H5Tget_offset" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetOffset">H5Tget_offset</a>
<dt><strong>Signature:</strong>
<dd><em>int </em><code>H5Tget_offset</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves the bit offset of the first significant bit.
<dt><strong>Description:</strong>
<dd><code>H5Tget_offset</code> retrieves the bit offset of the first significant bit.
The significant bits of an atomic datum can be offset from the beginning
of the memory for that datum by an amount of padding. The `offset'
property specifies the number of bits of padding that appear to the
"right of" the value. That is, if we have a 32-bit datum with 16-bits
of precision having the value 0x1122 then it will be laid out in
memory as (from small byte address toward larger byte addresses):
<br>
<br>
<table border align=center cellpadding=4 width="80%">
<tr align=center>
<th width="20%">Byte Position</th>
<th width="20%">Big-Endian Offset=0</th>
<th width="20%">Big-Endian Offset=16</th>
<th width="20%">Little-Endian Offset=0</th>
<th width="20%">Little-Endian Offset=16</th>
</tr>
<tr align=center>
<td>0:</td>
<td>[ pad]</td>
<td>[0x11]</td>
<td>[0x22]</td>
<td>[ pad]</td>
</tr>
<tr align=center>
<td>1:</td>
<td>[ pad]</td>
<td>[0x22]</td>
<td>[0x11]</td>
<td>[ pad]</td>
</tr>
<tr align=center>
<td>2:</td>
<td>[0x11]</td>
<td>[ pad]</td>
<td>[ pad]</td>
<td>[0x22]</td>
</tr>
<tr align=center>
<td>3:</td>
<td>[0x22]</td>
<td>[ pad]</td>
<td>[ pad]</td>
<td>[0x11]</td>
</tr>
</table>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns an offset value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tget_offset_f
<dd>
<pre>
SUBROUTINE h5tget_offset_f(type_id, offset, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: offset ! Datatype bit offset of the
! first significant bit
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_offset_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tget_order" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetOrder">H5Tget_order</a>
<dt><strong>Signature:</strong>
<dd><em>H5T_order_t </em><code>H5Tget_order</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns the byte order of an atomic datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tget_order</code> returns the byte order of an
atomic datatype.
<p>
Possible return values are:
<ul><dl>
<dt><code>H5T_ORDER_LE</code> (<code>0</code>)
<dd>Little endian byte ordering (default).
<dt><code>H5T_ORDER_BE</code> (<code>1</code>)
<dd>Big endian byte ordering.
<dt><code>H5T_ORDER_VAX</code> (<code>2</code>)
<dd>VAX mixed byte ordering (not currently supported).
</dl></ul>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a byte order constant if successful;
otherwise <code>H5T_ORDER_ERROR</code> (-1).
<dt><strong>Fortran90 Interface:</strong> h5tget_order_f
<dd>
<pre>
SUBROUTINE h5tget_order_f(type_id, order, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: order ! Datatype byte order
! Possible values are:
! H5T_ORDER_LE_F
! H5T_ORDER_BE_F
! H5T_ORDER_VAX_F
INTEGER, INTENT(OUT) :: hdferr ! Error code
! 0 on success and -1 on failure
END SUBROUTINE h5tget_order_f
</pre>
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<dd>
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<img src="Graphics/C++.gif">
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</dl>
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<!-- HEADER RIGHT "H5Tget_overflow" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetOverflow">H5Tget_overflow</a>
<dt><strong>Signature:</strong>
H5Tget_overflow ()
<dd><em>H5T_overflow_t</em> <code>H5Tget_overflow</code>(<code>void</code>)
<dt><strong>Purpose:</strong>
<dd>Returns a pointer to the current global overflow function.
<dt><strong>Description:</strong>
<dd><code>H5Tset_overflow</code> returns a pointer
to the current global overflow function.
This is an application-defined function that is called whenever a
datatype conversion causes an overflow.
<dt><strong>Parameters:</strong>
<dl>
<dt>None.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns a pointer to an application-defined function if successful.
Otherwise returns NULL; this can happen if no overflow handling
function is registered.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
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<pre>
SUBROUTINE
</pre>
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<dd>
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</dl>
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<!-- HEADER RIGHT "H5Tget_pad" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetPad">H5Tget_pad</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tget_pad</code>(<em>hid_t </em><code>type_id</code>,
<em>H5T_pad_t *</em> <code>lsb</code>,
<em>H5T_pad_t *</em> <code>msb</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves the padding type of the least and most-significant bit padding.
<dt><strong>Description:</strong>
<dd><code>H5Tget_pad</code> retrieves the padding type of the least and most-significant
bit padding. Valid types are:
<ul> <dl>
<dt>H5T_PAD_ZERO (<code>0</code>)
<dd>Set background to zeros.
<dt>H5T_PAD_ONE (<code>1</code>)
<dd>Set background to ones.
<dt>H5T_PAD_BACKGROUND (<code>2</code>)
<dd>Leave background alone.
</dl> </ul>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id</code></td>
<td valign="top">IN: Identifier of datatype to query.</td></tr>
<tr>
<td valign="top"><em>H5T_pad_t *</em> <code>lsb </code></td>
<td valign="top">OUT: Pointer to location to return least-significant
bit padding type.</td></tr>
<tr>
<td valign="top"><em>H5T_pad_t *</em> <code>msb</code></td>
<td valign="top">OUT: Pointer to location to return most-significant
bit padding type.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tget_pad_f
<dd>
<pre>
SUBROUTINE h5tget_pad_f(type_id, lsbpad, msbpad, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: lsbpad ! Padding type of the
! least significant bit
INTEGER, INTENT(OUT) :: msbpad ! Padding type of the
! most significant bit
! Possible values of
! padding type are:
! H5T_PAD_ZERO_F = 0
! H5T_PAD_ONE_F = 1
! H5T_PAD_BACKGROUND_F = 2
! H5T_PAD_ERROR_F = -1
! H5T_PAD_NPAD_F = 3
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_pad_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tget_precision" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetPrecision">H5Tget_precision</a>
<dt><strong>Signature:</strong>
<dd><em>size_t </em><code>H5Tget_precision</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns the precision of an atomic datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tget_precision</code> returns the precision of an atomic datatype. The
precision is the number of significant bits which, unless padding is
present, is 8 times larger than the value returned by H5Tget_size().
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns the number of significant bits if successful;
otherwise 0.
<dt><strong>Fortran90 Interface:</strong> h5tget_precision_f
<dd>
<pre>
SUBROUTINE h5tget_precision_f(type_id, precision, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: precision ! Datatype precision
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_precision_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tget_sign" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetSign">H5Tget_sign</a>
<dt><strong>Signature:</strong>
<dd><em>H5T_sign_t </em><code>H5Tget_sign</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves the sign type for an integer type.
<dt><strong>Description:</strong>
<dd><code>H5Tget_sign</code> retrieves the sign type for an integer type.
Valid types are:
<ul> <dl>
<dt>H5T_SGN_NONE (<code>0</code>)
<dd>Unsigned integer type.
<dt>H5T_SGN_2 (<code>1</code>)
<dd>Two's complement signed integer type.
</dl> </ul>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a valid sign type if successful;
otherwise <code>H5T_SGN_ERROR</code> (-1).
<dt><strong>Fortran90 Interface:</strong> h5tget_sign_f
<dd>
<pre>
SUBROUTINE h5tget_sign_f(type_id, sign, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: sign ! Sign type for an integer type
! Possible values are:
! Unsigned integer type
! H5T_SGN_NONE_F = 0
! Two's complement signed
! integer type
! H5T_SGN_2_F = 1
! or error value
! H5T_SGN_ERROR_F = -1
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_sign_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tget_size" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetSize">H5Tget_size</a>
<dt><strong>Signature:</strong>
<dd><em>size_t </em><code>H5Tget_size</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns the size of a datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tget_size</code> returns the size of a datatype in bytes.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns the size of the datatype in bytes if successful;
otherwise 0.
<dt><strong>Fortran90 Interface:</strong> h5tget_size_f
<dd>
<pre>
SUBROUTINE h5tget_size_f(type_id, size, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER(SIZE_T), INTENT(OUT) :: size ! Datatype size
INTEGER, INTENT(OUT) :: hdferr ! Error code
! 0 on success and -1 on failure
END SUBROUTINE h5tget_size_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tget_strpad" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetStrpad">H5Tget_strpad</a>
<dt><strong>Signature:</strong>
<dd><em>H5T_str_t </em><code>H5Tget_strpad</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Retrieves the storage mechanism for a string datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tget_strpad</code> retrieves the storage mechanism
for a string datatype, as defined in
<a href="#Datatype-SetStrpad"><code>H5Tset_strpad</code></a>.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to query.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a valid string storage mechanism if successful;
otherwise <code>H5T_STR_ERROR</code> (-1).
<dt><strong>Fortran90 Interface:</strong> h5tget_strpad_f
<dd>
<pre>
SUBROUTINE h5tget_strpad_f(type_id, strpad, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id
! Datatype identifier
INTEGER, INTENT(OUT) :: strpad ! String padding method for a string datatype
! Possible values of padding type are:
! Pad with zeros (as C does):
! H5T_STR_NULLPAD_F(0)
! Pad with spaces (as FORTRAN does):
! H5T_STR_SPACEPAD_F(1)
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_strpad_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tget_super" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetSuper">H5Tget_super</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t</em> <code>H5Tget_super</code>(<em>hid_t</em> <code>type</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns the base datatype from which a datatype is derived.
<dt><strong>Description:</strong>
<dd><code>H5Tget_super</code> returns the base datatype from which the
datatype <code>type</code> is derived.
<P>
In the case of an enumeration type, the return value is an integer type.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type </code></td>
<td valign="top">Datatype identifier for the derived datatype.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns the datatype identifier for the base datatype if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tget_super_f
<dd>
<pre>
SUBROUTINE h5tget_super_f(type_id, base_type_id, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER(HID_T), INTENT(OUT) :: type_id ! Base datatype identifier
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_super_f
</pre>
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<dd>
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-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tget_tag" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-GetTag">H5Tget_tag</a>
<dt><strong>Signature:</strong>
<dd><em>char</em> *<code>H5Tget_tag</code>(<em>hid_t</em> <code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Gets the tag associated with an opaque datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tget_tag</code> returns the tag associated with
the opaque datatype <code>type_id</code>.
<P>
The tag is returned via a pointer to an
allocated string, which the caller must free.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Datatype identifier for the opaque datatype.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a pointer to an allocated string if successful;
otherwise returns <code>NULL</code>.
<dt><strong>Fortran90 Interface:</strong> h5tget_tag_f
<dd>
<pre>
SUBROUTINE h5tget_tag_f(type_id, tag,taglen, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
CHARACTER(LEN=*), INTENT(OUT) :: tag ! Unique ASCII string with which the
! opaque datatype is to be tagged
INTEGER, INTENT(OUT) :: taglen ! Length of tag
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tget_tag_f
</pre>
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<dd>
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<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tinsert" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-Insert">H5Tinsert</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Tinsert</code>(<em>hid_t </em><code>type_id</code>,
<em>const char *</em> <code>name</code>,
<em>size_t</em> <code>offset</code>,
<em>hid_t</em> <code>field_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Adds a new member to a compound datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tinsert</code> adds another member to the compound datatype
<code>type_id</code>. The new member has a <code>name</code> which
must be unique within the compound datatype.
The <code>offset</code> argument defines the start of the member
in an instance of the compound datatype, and <code>field_id</code>
is the datatype identifier of the new member.
<P>
Note: Members of a compound datatype do not have to be atomic datatypes;
a compound datatype can have a member which is a compound datatype.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id</code></td>
<td valign="top">Identifier of compound datatype to modify.</td></tr>
<tr>
<td valign="top"><em>const char *</em> <code>name </code></td>
<td valign="top">Name of the field to insert.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>offset</code></td>
<td valign="top">Offset in memory structure of the field to insert.</td></tr>
<tr>
<td valign="top"><em>hid_t</em> <code>field_id</code></td>
<td valign="top">Datatype identifier of the field to insert.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tinsert_f
<dd>
<pre>
SUBROUTINE h5tinsert_f(type_id, name, offset, field_id, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
CHARACTER(LEN=*), INTENT(IN) :: name ! Name of the field to insert
INTEGER(SIZE_T), INTENT(IN) :: offset ! Offset in memory structure
! of the field to insert
INTEGER(HID_T), INTENT(IN) :: field_id ! Datatype identifier of the
! new member
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tinsert_f
</pre>
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<dd>
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-->
</dl>
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<!-- HEADER RIGHT "H5Tis_variable_str" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-IsVariableString">H5Tis_variable_str</a>
<dt><strong>Signature:</strong>
<dd><em>htri_t </em><code>H5Tis_variable_str</code>(<em>hid_t </em><code>dtype_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Determines whether datatype is a variable-length string.
<dt><strong>Description:</strong>
<dd><code>H5Tvlen_create</code> determines whether the datatype
identified in <code>dtype_id</code> is a variable-length string.
<p>
This function can be used to distinguish between
fixed and variable-length string datatypes.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>dtype_id </code></td>
<td valign="top">Datatype identifier.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns <code>TRUE</code> or <code>FALSE</code> if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tis_variable_str_f
<dd>
<pre>
SUBROUTINE h5tis_variable_str_f(type_id, status, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
LOGICAL, INTENT(OUT) :: status ! Logical flag:
! .TRUE. if datatype is a
! varibale string
! .FALSE. otherwise
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tis_variable_str_f
</pre>
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<dd>
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-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tlock" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-Lock">H5Tlock</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tlock</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Locks a datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tlock</code> locks the datatype specified by the
<code>type_id</code> identifier, making it read-only and
non-destructible. This is normally done by the library for
predefined datatypes so the application does not
inadvertently change or delete a predefined type.
Once a datatype is locked it can never be unlocked.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to lock.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
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<pre>
SUBROUTINE
</pre>
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<dd>
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<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Topen" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-Open">H5Topen</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t</em><code>H5Topen</code>(<em>hid_t</em> <code>loc_id</code>,
<em>const char *</em> <code>name</code>
)
<dt><strong>Purpose:</strong>
<dd>Opens a named datatype.
<dt><strong>Description:</strong>
<dd><code>H5Topen</code> opens a named datatype at the location
specified by <code>loc_id</code> and returns an identifier
for the datatype. <code>loc_id</code> is either a file or
group identifier. The identifier should eventually be closed
by calling <code>H5Tclose</code> to release resources.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>loc_id</code></td>
<td valign="top">IN: A file or group identifier.</td></tr>
<tr>
<td valign="top"><em>const char *</em> <code>name </code></td>
<td valign="top">IN: A datatype name, defined within the file
or group identified by <code>loc_id</code>.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a named datatype identifier if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5topen_f
<dd>
<pre>
SUBROUTINE h5topen_f(loc_id, name, type_id, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: loc_id ! File or group identifier
CHARACTER(LEN=*), INTENT(IN) :: name ! Datatype name within file or
! group
INTEGER(HID_T), INTENT(out) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: hdferr ! Error code
! 0 on success and -1 on failure
END SUBROUTINE h5topen_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
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<!-- HEADER RIGHT "H5Tpack" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-Pack">H5Tpack</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Tpack</code>(<em>hid_t </em><code>type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Recursively removes padding from within a compound datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tpack</code> recursively removes padding from within a compound
datatype to make it more efficient (space-wise) to store that data.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to modify.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tpack_f
<dd>
<pre>
SUBROUTINE h5tpack_f(type_id, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tpack_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
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<!-- HEADER RIGHT "H5Tregister" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-Register">H5Tregister</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Tregister</code>(<em>H5T_pers_t</em> <code>pers</code>,
<em>const char *</em> <code>name</code>,
<em>hid_t </em><code>src_id</code>,
<em>hid_t</em> <code>dst_id</code>,
<em>H5T_conv_t</em> <code>func</code>
)
<dt><strong>Purpose:</strong>
<dd>Registers a conversion function.
<dt><strong>Description:</strong>
<dd><code>H5Tregister</code> registers a hard or soft conversion function
for a datatype conversion path.
<p>
The parameter <code>pers</code> indicates whether a conversion function
is <em>hard</em> (<code>H5T_PERS_HARD</code>)
or <em>soft</em> (<code>H5T_PERS_SOFT</code>).
<p>
A conversion path can have only one hard function.
When <code>pers</code> is <code>H5T_PERS_HARD</code>,
<code>func</code> replaces any previous hard function.
If <code>pers</code> is <code>H5T_PERS_HARD</code> and
<code>func</code> is the null pointer, then any hard function
registered for this path is removed.
<p>
When <code>pers</code> is <code>H5T_PERS_SOFT</code>,
<code>H5Tregister</code>
adds the function to the end of the master soft list and replaces
the soft function in all applicable existing conversion paths.
Soft functions are used when determining which conversion function
is appropriate for this path.
<p>
The <code>name</code> is used only for debugging and should be a
short identifier for the function.
<p>
The path is specified by the source and destination datatypes
<code>src_id</code> and <code>dst_id</code>.
For soft conversion functions, only the class of these types is important.
<p>
The type of the conversion function pointer is declared as:
<dir>
<pre><code>typedef</code> <em>herr_t </em>(<code>*H5T_conv_t</code>) (<em>hid_t </em><code>src_id</code>,
<em>hid_t </em><code>dst_id</code>,
<em>H5T_cdata_t *</em><code>cdata</code>,
<em>size_t </em><code>nelmts</code>,
<em>size_t </em><code>buf_stride</code>,
<em>size_t </em><code>bkg_stride</code>,
<em>void *</em><code>buf</code>,
<em>void *</em><code>bkg</code>,
<em>hid_t </em><code>dset_xfer_plist</code>)</pre>
</dir>
<p>
The <code>H5T_cdata_t</code> struct is declared as:
<dir>
<pre><code>typedef</code> <em>struct </em><code>*H5T_cdata_t</code> (<em>H5T_cmd_t </em><code>command</code>,
<em>H5T_bkg_t </em><code>need_bkg</code>,
<em>hbool_t *</em><code>recalc</code>,
<em>void *</em><code>priv</code>)</pre>
</dir>
<p>
The <code>H5T_conv_t</code> parameters and
the elements of the <code>H5T_cdata_t</code> struct
are described more fully in the
“<a href="Datatypes.html#Datatypes-DataConversion"
target="WinUG">Data Conversion</a>”
section of “The Datatype Interface (H5T)”
in the <cite>HDF5 User's Guide</cite>.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>H5T_pers_t</em> <code>pers</code></td>
<td valign="top"><code>H5T_PERS_HARD</code> for hard conversion functions;
<code>H5T_PERS_SOFT</code> for soft conversion functions.</td></tr>
<tr>
<td valign="top"><em>const char *</em> <code>name</code></td>
<td valign="top">Name displayed in diagnostic output.</td></tr>
<tr>
<td valign="top"><em>hid_t</em> <code>src_id</code></td>
<td valign="top">Identifier of source datatype.</td></tr>
<tr>
<td valign="top"><em>hid_t</em> <code>dst_id</code></td>
<td valign="top">Identifier of destination datatype.</td></tr>
<tr>
<td valign="top"><em>H5T_conv_t</em> <code>func </code></td>
<td valign="top">Function to convert between source and destination datatypes.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong>
<dd>None.
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<pre>
SUBROUTINE
</pre>
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-SetCset">H5Tset_cset</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tset_cset</code>(<em>hid_t </em><code>type_id</code>,
<em>H5T_cset_t</em> <code>cset</code>
)
<dt><strong>Purpose:</strong>
<dd>Sets character set to be used.
<dt><strong>Description:</strong>
<dd><code>H5Tset_cset</code> the character set to be used.
<p>
HDF5 is able to distinguish between character sets of different
nationalities and to convert between them to the extent possible.
Valid character set types are:
<ul> <dl>
<dt>H5T_CSET_ASCII (<code>0</code>)
<dd>Character set is US ASCII.
</dl> </ul>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id</code></td>
<td valign="top">Identifier of datatype to modify.</td></tr>
<tr>
<td valign="top"><em>H5T_cset_t</em> <code>cset </code></td>
<td valign="top">Character set type.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tset_cset_f
<dd>
<pre>
SUBROUTINE h5tset_cset_f(type_id, cset, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id
! Datatype identifier
INTEGER, INTENT(IN) :: cset ! Character set type of a string datatype
! Possible values of padding type are:
! H5T_CSET_ASCII_F = 0
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tset_cset_f
</pre>
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<dd>
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<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tset_ebias" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-SetEbias">H5Tset_ebias</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tset_ebias</code>(<em>hid_t </em><code>type_id</code>,
<em>size_t</em> <code>ebias</code>
)
<dt><strong>Purpose:</strong>
<dd>Sets the exponent bias of a floating-point type.
<dt><strong>Description:</strong>
<dd><code>H5Tset_ebias</code> sets the exponent bias of a floating-point type.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to set.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>ebias</code></td>
<td valign="top">Exponent bias value.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tset_ebias_f
<dd>
<pre>
SUBROUTINE h5tset_ebias_f(type_id, ebias, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(IN) :: ebias ! Datatype exponent bias
! of a floating-point type,
! which cannot be 0
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tset_ebias_f
</pre>
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<dd>
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</dl>
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<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-SetFields">H5Tset_fields</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tset_fields</code>(<em>hid_t </em><code>type_id</code>,
<em>size_t</em> <code>spos</code>,
<em>size_t</em> <code>epos</code>,
<em>size_t</em> <code>esize</code>,
<em>size_t</em> <code>mpos</code>,
<em>size_t</em> <code>msize</code>
)
<dt><strong>Purpose:</strong>
<dd>Sets locations and sizes of floating point bit fields.
<dt><strong>Description:</strong>
<dd><code>H5Tset_fields</code> sets the locations and sizes of the various
floating-point bit fields. The field positions are bit positions in the
significant region of the datatype. Bits are numbered with the least
significant bit number zero.
<P>Fields are not allowed to extend beyond the number of bits of
precision, nor are they allowed to overlap with one another.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to set.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>spos</code></td>
<td valign="top">Sign position, i.e., the bit offset of the floating-point
sign bit.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>epos</code></td>
<td valign="top">Exponent bit position.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>esize</code></td>
<td valign="top">Size of exponent in bits.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>mpos</code></td>
<td valign="top">Mantissa bit position.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>msize</code></td>
<td valign="top">Size of mantissa in bits.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tset_fields_f
<dd>
<pre>
SUBROUTINE h5tset_fields_f(type_id, epos, esize, mpos, msize, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(IN) :: epos ! Exponent bit-position
INTEGER, INTENT(IN) :: esize ! Size of exponent in bits
INTEGER, INTENT(IN) :: mpos ! Mantissa bit-position
INTEGER, INTENT(IN) :: msize ! Size of mantissa in bits
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tset_fields_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 "H5Tset_inpad" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-SetInpad">H5Tset_inpad</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tset_inpad</code>(<em>hid_t </em><code>type_id</code>,
<em>H5T_pad_t</em> <code>inpad</code>
)
<dt><strong>Purpose:</strong>
<dd>Fills unused internal floating point bits.
<dt><strong>Description:</strong>
<dd>If any internal bits of a floating point type are unused
(that is, those significant bits which are not part of the
sign, exponent, or mantissa), then <code>H5Tset_inpad</code> will be filled
according to the value of the padding value property <code>inpad</code>.
Valid padding types are:
<ul> <dl>
<dt>H5T_PAD_ZERO (<code>0</code>)
<dd>Set background to zeros.
<dt>H5T_PAD_ONE (<code>1</code>)
<dd>Set background to ones.
<dt>H5T_PAD_BACKGROUND (<code>2</code>)
<dd>Leave background alone.
</dl> </ul>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id</code></td>
<td valign="top">Identifier of datatype to modify.</td></tr>
<tr>
<td valign="top"><em>H5T_pad_t</em> <code>pad </code></td>
<td valign="top">Padding type.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tset_inpad_f
<dd>
<pre>
SUBROUTINE h5tset_inpad_f(type_id, padtype, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id
! Datatype identifier
INTEGER, INTENT(IN) :: padtype ! Padding type for unused bits
! in floating-point datatypes.
! Possible values of padding type are:
! H5T_PAD_ZERO_F = 0
! H5T_PAD_ONE_F = 1
! H5T_PAD_BACKGROUND_F = 2
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tset_inpad_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 "H5Tset_norm" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-SetNorm">H5Tset_norm</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tset_norm</code>(<em>hid_t </em><code>type_id</code>,
<em>H5T_norm_t</em> <code>norm</code>
)
<dt><strong>Purpose:</strong>
<dd>Sets the mantissa normalization of a floating-point datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tset_norm</code> sets the mantissa normalization of
a floating-point datatype. Valid normalization types are:
<ul> <dl>
<dt>H5T_NORM_IMPLIED (<code>0</code>)
<dd>MSB of mantissa is not stored, always 1
<dt>H5T_NORM_MSBSET (<code>1</code>)
<dd>MSB of mantissa is always 1
<dt>H5T_NORM_NONE (<code>2</code>)
<dd>Mantissa is not normalized
</dl> </ul>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id</code></td>
<td valign="top">Identifier of datatype to set.</td></tr>
<tr>
<td valign="top"><em>H5T_norm_t</em> <code>norm </code></td>
<td valign="top">Mantissa normalization type.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tset_norm_f
<dd>
<pre>
SUBROUTINE h5tset_norm_f(type_id, norm, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id
! Datatype identifier
INTEGER, INTENT(IN) :: norm ! Mantissa normalization of a
! floating-point datatype
! Valid normalization types are:
! H5T_NORM_IMPLIED_F(0)
! MSB of mantissa is not stored,
! always 1
! H5T_NORM_MSBSET_F(1)
! MSB of mantissa is always 1
! H5T_NORM_NONE_F(2)
! Mantissa is not normalized
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tset_norm_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 "H5Tset_offset" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-SetOffset">H5Tset_offset</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tset_offset</code>(<em>hid_t </em><code>type_id</code>,
<em>size_t</em> <code>offset</code>
)
<dt><strong>Purpose:</strong>
<dd>Sets the bit offset of the first significant bit.
<dt><strong>Description:</strong>
<dd><code>H5Tset_offset</code> sets the bit offset of the first significant bit. The
significant bits of an atomic datum can be offset from the beginning of
the memory for that datum by an amount of padding. The `offset'
property specifies the number of bits of padding that appear to the
"right of" the value. That is, if we have a 32-bit datum with 16-bits
of precision having the value 0x1122 then it will be laid out in
memory as (from small byte address toward larger byte addresses):
<br>
<br>
<table border align=center cellpadding=4 width="80%">
<tr align=center>
<th width="20%">Byte Position</th>
<th width="20%">Big-Endian Offset=0</th>
<th width="20%">Big-Endian Offset=16</th>
<th width="20%">Little-Endian Offset=0</th>
<th width="20%">Little-Endian Offset=16</th>
</tr>
<tr align=center>
<td>0:</td>
<td>[ pad]</td>
<td>[0x11]</td>
<td>[0x22]</td>
<td>[ pad]</td>
</tr>
<tr align=center>
<td>1:</td>
<td>[ pad]</td>
<td>[0x22]</td>
<td>[0x11]</td>
<td>[ pad]</td>
</tr>
<tr align=center>
<td>2:</td>
<td>[0x11]</td>
<td>[ pad]</td>
<td>[ pad]</td>
<td>[0x22]</td>
</tr>
<tr align=center>
<td>3:</td>
<td>[0x22]</td>
<td>[ pad]</td>
<td>[ pad]</td>
<td>[0x11]</td>
</tr>
</table>
<P>If the offset is incremented then the total size is
incremented also if necessary to prevent significant bits of
the value from hanging over the edge of the datatype.
<P>The offset of an H5T_STRING cannot be set to anything but
zero.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to set.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>offset</code></td>
<td valign="top">Offset of first significant bit.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tset_offset_f
<dd>
<pre>
SUBROUTINE h5tset_offset_f(type_id, offset, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(IN) :: offset ! Datatype bit offset of
! the first significant bit
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tset_offset_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 "H5Tset_order" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-SetOrder">H5Tset_order</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tset_order</code>(<em>hid_t </em><code>type_id</code>,
<em>H5T_order_t</em><code>order</code>
)
<dt><strong>Purpose:</strong>
<dd>Sets the byte ordering of an atomic datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tset_order</code> sets the byte ordering of an atomic datatype.
Byte orderings currently supported are:
<ul> <dl>
<dt>H5T_ORDER_LE (<code>0</code>)
<dd> Little-endian byte ordering (default).
<dt>H5T_ORDER_BE (<code>1</code>)
<dd> Big-endian byte ordering.
<dt>H5T_ORDER_VAX (<code>2</code>)
<dd>VAX mixed byte ordering (not currently supported).
</dl> </ul>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id</code></td>
<td valign="top">Identifier of datatype to set.</td></tr>
<tr>
<td valign="top"><em>H5T_order_t</em> <code>order </code></td>
<td valign="top">Byte ordering constant.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tset_order_f
<dd>
<pre>
SUBROUTINE h5tset_order_f(type_id, order, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(IN) :: order ! Datatype byte order
! Possible values are:
! H5T_ORDER_LE_F
! H5T_ORDER_BE_F
! H5T_ORDER_VAX_F
INTEGER, INTENT(OUT) :: hdferr ! Error code
! 0 on success and -1 on failure
END SUBROUTINE h5tset_order_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 "H5Tset_overflow" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-SetOverflow">H5Tset_overflow</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Tset_overflow</code>(<em>H5T_overflow_t</em> <code>func</code>)
<dt><strong>Purpose:</strong>
<dd>Sets the overflow handler to a specified function.
<dt><strong>Description:</strong>
<dd><code>H5Tset_overflow</code> sets the overflow handler
to be the function specified by <code>func</code>.
<code>func</code> will be called for all datatype conversions that
result in an overflow.
<p>
See the definition of <code>H5T_overflow_t</code> in
<code>H5Tpublic.h</code> for documentation
of arguments and return values.
The prototype for <code>H5T_overflow_t</code> is as follows:<br>
<code>herr_t (*H5T_overflow_t)(hid_t src_id, hid_t dst_id,
void *src_buf, void *dst_buf);
</code>
<p>
The NULL pointer may be passed to remove the overflow handler.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>H5T_overflow_t</em> <code>func </code></td>
<td valign="top">Overflow function.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a 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 "H5Tset_pad" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-SetPad">H5Tset_pad</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tset_pad</code>(<em>hid_t </em><code>type_id</code>,
<em>H5T_pad_t</em> <code>lsb</code>,
<em>H5T_pad_t</em> <code>msb</code>
)
<dt><strong>Purpose:</strong>
<dd>Sets the least and most-significant bits padding types.
<dt><strong>Description:</strong>
<dd><code>H5Tset_pad</code> sets the least and most-significant bits padding types.
<dl> <ul>
<dt>H5T_PAD_ZERO (<code>0</code>)
<dd>Set background to zeros.
<dt>H5T_PAD_ONE (<code>1</code>)
<dd>Set background to ones.
<dt>H5T_PAD_BACKGROUND (<code>2</code>)
<dd>Leave background alone.
</ul> </dl>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id</code></td>
<td valign="top">Identifier of datatype to set.</td></tr>
<tr>
<td valign="top"><em>H5T_pad_t</em> <code>lsb </code></td>
<td valign="top">Padding type for least-significant bits.</td></tr>
<tr>
<td valign="top"><em>H5T_pad_t</em> <code>msb</code></td>
<td valign="top">Padding type for most-significant bits.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tset_pad_f
<dd>
<pre>
SUBROUTINE h5tset_pad_f(type_id, lsbpad, msbpad, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(IN) :: lsbpad ! Padding type of the
! least significant bit
INTEGER, INTENT(IN) :: msbpad ! Padding type of the
! most significant bit
! Possible values of padding
! type are:
! H5T_PAD_ZERO_F = 0
! H5T_PAD_ONE_F = 1
! H5T_PAD_BACKGROUND_F = 2
! H5T_PAD_ERROR_F = -1
! H5T_PAD_NPAD_F = 3
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tset_pad_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 "H5Tset_precision" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-SetPrecision">H5Tset_precision</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tset_precision</code>(<em>hid_t </em><code>type_id</code>,
<em>size_t</em><code>precision</code>
)
<dt><strong>Purpose:</strong>
<dd>Sets the precision of an atomic datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tset_precision</code> sets the precision of an atomic datatype.
The precision is the number of significant bits which, unless padding
is present, is 8 times larger than the value returned by H5Tget_size().
<P>If the precision is increased then the offset is decreased and then
the size is increased to insure that significant bits do not "hang
over" the edge of the datatype.
<P>Changing the precision of an H5T_STRING automatically changes the
size as well. The precision must be a multiple of 8.
<P>When decreasing the precision of a floating point type, set the
locations and sizes of the sign, mantissa, and exponent fields
first.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id</code></td>
<td valign="top">Identifier of datatype to set.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>precision </code></td>
<td valign="top">Number of bits of precision for datatype.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tset_precision_f
<dd>
<pre>
SUBROUTINE h5tset_precision_f(type_id, precision, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER, INTENT(IN) :: precision ! Datatype precision
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tset_precision_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 "H5Tset_sign" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-SetSign">H5Tset_sign</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tset_sign</code>(<em>hid_t </em><code>type_id</code>,
<em>H5T_sign_t</em> <code>sign</code>
)
<dt><strong>Purpose:</strong>
<dd>Sets the sign property for an integer type.
<dt><strong>Description:</strong>
<dd><code>H5Tset_sign</code> sets the sign property for an integer type.
<dl>
<dt>H5T_SGN_NONE (<code>0</code>)
<dd>Unsigned integer type.
<dt>H5T_SGN_2 (<code>1</code>)
<dd>Two's complement signed integer type.
</dl>
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id</code></td>
<td valign="top">Identifier of datatype to set.</td></tr>
<tr>
<td valign="top"><em>H5T_sign_t</em> <code>sign </code></td>
<td valign="top">Sign type.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tset_sign_f
<dd>
<pre>
SUBROUTINE h5tset_sign_f(type_id, sign, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id
! Datatype identifier
INTEGER, INTENT(IN) :: sign ! Sign type for an integer type
! Possible values are:
! Unsigned integer type
! H5T_SGN_NONE_F = 0
! Two's complement signed integer type
! H5T_SGN_2_F = 1
! or error value
! H5T_SGN_ERROR_F=-1
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tset_sign_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tset_size" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-SetSize">H5Tset_size</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tset_size</code>(<em>hid_t </em><code>type_id</code>,
<em>size_t</em><code>size</code>
)
<dt><strong>Purpose:</strong>
<dd>Sets the total size for an atomic datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tset_size</code> sets the total size in bytes,
<code>size</code>, for a datatype. If the datatype is atomic and size
is decreased so that the significant bits of the datatype extend beyond
the edge of the new size, then the `offset' property is decreased
toward zero. If the `offset' becomes zero and the significant
bits of the datatype still hang over the edge of the new size, then
the number of significant bits is decreased.
The size set for a string should include space for the null-terminator
character, otherwise it will not be stored on (or retrieved from) disk.
Adjusting the size of a string automatically sets the precision
to 8*<code>size</code>. A compound datatype may increase in size,
but may not shrink. All datatypes must have a positive size.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id </code></td>
<td valign="top">Identifier of datatype to change size.</td></tr>
<tr>
<td valign="top"><em>size_t</em> <code>size</code></td>
<td valign="top">Size in bytes to modify datatype.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tset_size_f
<dd>
<pre>
SUBROUTINE h5tset_size_f(type_id, size, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
INTEGER(SIZE_T), INTENT(IN) :: size ! Datatype size
INTEGER, INTENT(OUT) :: hdferr ! Error code
! 0 on success and -1 on failure
END SUBROUTINE h5tset_size_f
</pre>
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<dd>
<img src="Graphics/Java.gif">
<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tset_strpad" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-SetStrpad">H5Tset_strpad</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Tset_strpad</code>(<em>hid_t </em><code>type_id</code>,
<em>H5T_str_t</em> <code>strpad</code>
)
<dt><strong>Purpose:</strong>
<dd>Defines the storage mechanism for character strings.
<dt><strong>Description:</strong>
<dd><code>H5Tset_strpad</code> defines the storage mechanism for the string.
<p>
The method used to store character strings differs with the
programming language:
<ul>
<li>C usually null terminates strings while
<li>Fortran left-justifies and space-pads strings.
</ul>
Valid string padding values, as passed in the parameter
<code>strpad</code>, are as follows:
<ul> <dl>
<dt>H5T_STR_NULLTERM (<code>0</code>)
<dd>Null terminate (as C does)
<dt>H5T_STR_NULLPAD (<code>1</code>)
<dd>Pad with zeros
<dt>H5T_STR_SPACEPAD (<code>2</code>)
<dd>Pad with spaces (as FORTRAN does)
</dl> </ul>
<p>
When converting from a longer string to a shorter string,
the behavior is as follows.
If the short string is <code>H5T_STR_NULLPAD</code> or
<code>H5T_STR_SPACEPAD</code>, then the string is simply truncated.
If the short string is <code>H5T_STR_NULLTERM</code>, it is
truncated and a null terminator is appended.
<p>
When converting from a shorter string to a longer string,
the long string is padded on the end by appending nulls or spaces.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id</code></td>
<td valign="top">Identifier of datatype to modify.</td></tr>
<tr>
<td valign="top"><em>H5T_str_t</em> <code>strpad </code></td>
<td valign="top">String padding type.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tset_strpad_f
<dd>
<pre>
SUBROUTINE h5tset_strpad_f(type_id, strpad, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id
! Datatype identifier
INTEGER, INTENT(IN) :: strpad ! String padding method for a string datatype
! Possible values of padding type are:
! Pad with zeros (as C does):
! H5T_STR_NULLPAD_F(0)
! Pad with spaces (as FORTRAN does):
! H5T_STR_SPACEPAD_F(1)
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tset_strpad_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 "H5Tset_tag" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-SetTag">H5Tset_tag</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Tset_tag</code>(<em>hid_t</em> <code>type_id</code>
<em>const char</em> *<code>tag</code>
)
<dt><strong>Purpose:</strong>
<dd>Tags an opaque datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tset_tag</code> tags an opaque datatype <code>type_id</code>
with a descriptive ASCII identifier,<code> tag</code>.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>type_id</code></td>
<td valign="top">IN: Datatype identifier for the opaque datatype to be tagged.</td></tr>
<tr>
<td valign="top"><em>const char</em> *<code>tag </code></td>
<td valign="top">IN: Descriptive ASCII string with which the
opaque datatype is to be tagged.</td></tr>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a non-negative value if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tset_tag_f
<dd>
<pre>
SUBROUTINE h5tset_tag_f(type_id, tag, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier
CHARACTER(LEN=*), INTENT(IN) :: tag ! Unique ASCII string with which the
! opaque datatype is to be tagged
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tset_tag_f
</pre>
<!--<dt><strong>Non-C API(s):</strong>
<dd>
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<img src="Graphics/C++.gif">
-->
</dl>
<!-- NEW PAGE -->
<!-- HEADER RIGHT "H5Tunregister" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-Unregister">H5Tunregister</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t</em> <code>H5Tunregister</code>(<em>H5T_conv_t</em> <code>func</code>
)
<dt><strong>Purpose:</strong>
<dd>Removes a conversion function from all conversion paths.
<dt><strong>Description:</strong>
<dd><code>H5Tunregister</code> removes a conversion function from all conversion paths.
<P>
The conversion function pointer type declaration is described in
<a href="#Datatype-Register">H5Tregister</a>.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>H5T_conv_t</em> <code>func </code></td>
<td valign="top">Function to remove from conversion paths.</td>
</table></ul>
<dt><strong>Returns:</strong>
<dd>Returns a 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 "H5Tvlen_create" -->
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Datatype-VLCreate">H5Tvlen_create</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t </em><code>H5Tvlen_create</code>(<em>hid_t </em><code>base_type_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Creates a new variable-length datatype.
<dt><strong>Description:</strong>
<dd><code>H5Tvlen_create</code> creates a new variable-length (VL) datatype.
<p>
The base datatype will be the datatype that the sequence is composed of,
characters for character strings, vertex coordinates for polygon lists, etc.
The base type specified for the VL datatype can be of any HDF5 datatype,
including another VL datatype, a compound datatype or an atomic datatype.
<p>
When necessary, use <code>H5Tget_super</code> to determine the base type
of the VL datatype.
<p>
The datatype identifier returned from this function should be
released with <code>H5Tclose</code> or resource leaks will result.
<dt><strong>Parameters:</strong>
<ul><table>
<tr>
<td valign="top"><em>hid_t</em> <code>base_type_id </code></td>
<td valign="top">Base type of datatype to create.</td></tr>
</table></ul>
<dt><strong>See Also:</strong>
<dd><a href="RM_H5D.html#Dataset-GetVLBuf">H5Dget_vlen_buf_size</a>
<dd><a href="RM_H5D.html#Dataset-VLReclaim">H5Dvlen_reclaim</a>
<dt><strong>Returns:</strong>
<dd>Returns datatype identifier if successful;
otherwise returns a negative value.
<dt><strong>Fortran90 Interface:</strong> h5tvlen_create_f
<dd>
<pre>
SUBROUTINE h5tvlen_create_f(type_id, vltype_id, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: type_id ! Datatype identifier of base type
! Base type can only be atomic
INTEGER(HID_T), INTENT(OUT) :: vltype_id ! VL datatype identifier
INTEGER, INTENT(OUT) :: hdferr ! Error code
END SUBROUTINE h5tvlen_create_f
</pre>
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<dd>
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Describes HDF5 Release 1.6.3, September 2004
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