750856c53a
Added link to Tools.html
Clean up formatting.
Added RM_H5R.html, Ragged Arrays, but link is commented out for Beta.
RM_H5.html
H5version Removed patch number parameter.
H5check_version Removed patch number parameter.
Corrected datatype to unsigned (was unsigned *).
Added missing "Purpose:" statement.
RM_H5A.html
H5Aread/write Added reference to data conversion limitations.
RM_H5D.html
H5Dwrite Added "Writing to an external dataset will fail
if the HDF5 file is not open for writing."
H5Dread/write Added reference to data conversion limitations.
RM_H5F.html
H5Fflush Added H5Fflush.
RM_H5G.html
H5Gget_stat Fixed formatting error.
Added mtime to the description of the data structure.
Added the following "Note:", per Robb's checkin mesage:
"Some systems will be able to record the time
accurately but unable to retrieve the correct time;
such systems (e.g., Irix64) will report an mtime
value of 0 (zero)."
Corrected successful return value.
H5Gset_comment Added the following statement to "Description:"
"Comments can be attached to any object that
has an object header, e.g., data sets, groups,
named data types, and data spaces,
but not symbolic links.
RM_H5P.html
Cleaned up file formatting.
H5Pset_filter Added these three functions.
H5Pget_nfilters
H5Pget_filter
H5Pget_deflate Removed these three functions. (Actually,
H5Pset_compression they are commented out, in case they should
H5Pget_compression be reinstated.)
RM_H5R.html
Intial version of H5R reference manual entry, but still largely
just a template.
Not yet ready for distribution.
Links to this document are currently commented out.
RM_H5S.html
H5S_set_extent_simple Changed name to H5Sselect_extent_simple.
now: H5Sselect_extent_simpl
H5Sselect_npoints Corrected return value.
Now: H5Sget_select_npoints
H5Sget_class Reinstated to RM. Changed name.
now: H5Sget_space_type
H5Soffset_simple Added these 6 functions. The there is a
H5Sextent_copy link to Dataspaces.html for the 10 "not yet
H5Sset_extent_none implemented (NYI)" functions.
H5Sselect_all
H5Sselect_none
H5Sselect_valid
RM_H5T.html
Added the following datatypes (though the list of native datatypes
is commented out):
H5T_NATIVE_HSIZE
H5T_NATIVE_HSSIZE
H5T_NATIVE_HERR
H5T_NATIVE_HBOOL
Tools.html
Corrected h5ls and h5repart sections.
Glossary.html
Unlinked for Beta.
Copyright.html
New file.
Copyright statement, linked into User's Guide and Reference Manual.
General
Changed the following function names:
From: To:
H5version H5get_libversion
H5vers_check H5check_version
H5Anum_attrs H5Aget_num_attrs
H5Fget_create_template H5Fget_create_plist
H5Fget_access_template H5Fget_access_plist
And associated "template" -> "property list" edits.
H5Gstat H5Gget_stat
H5Sextent_npoints H5Sget_simple_extent_npoints
H5Sextent_ndims H5Sget_simple_extent_ndims
H5Sextent_dims H5Sget_simple_extent_dims
H5Sget_class H5Sget_simple_extent_type
H5Sselect_npoints H5Sget_select_npoints
Added links to Tools.html and RM_H5R.html (Ragged Arrays),
though link to RM_H5R.html is commented out for now.
335 lines
12 KiB
HTML
335 lines
12 KiB
HTML
<html>
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<head><title>
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HDF5/H5F Draft API Specification
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</title></head>
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<body>
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<hr>
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<center>
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<a href="RM_H5Front.html">HDF5 Reference Manual</a>
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<a href="RM_H5.html">H5</a>
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<a href="RM_H5A.html">H5A</a>
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<a href="RM_H5D.html">H5D</a>
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<a href="RM_H5E.html">H5E</a>
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H5F
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<a href="RM_H5G.html">H5G</a>
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<a href="RM_H5P.html">H5P</a>
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<a href="RM_H5S.html">H5S</a>
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<a href="RM_H5T.html">H5T</a>
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<a href="RM_H5Z.html">H5Z</a>
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<a href="Tools.html">Tools</a>
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<!--
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<a href="Glossary.html">Glossary</a>
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-->
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</center>
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<hr>
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<center>
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<h1>H5F: File Interface</h1>
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</center>
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<h2>File API Functions</h2>
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These functions are designed to provide file-level access to HDF5 files.
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Further manipulation of objects inside a file is performed through one of APIs
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documented below.
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<table border=0>
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<tr><td valign=top>
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<ul>
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<li><a href="#File-Open">H5Fopen</a>
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<li><a href="#File-Create">H5Fcreate</a>
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<li><a href="#File-IsHDF5">H5Fis_hdf5</a>
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</ul>
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</td><td> </td><td valign=top>
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<ul>
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<li><a href="#File-Flush">H5Fflush</a>
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<li><a href="#File-Close">H5Fclose</a>
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</ul>
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</td><td> </td><td valign=top>
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<ul>
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<li><a href="#File-GetCreatePlist">H5Fget_create_plist</a>
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<li><a href="#File-GetAccessPlist">H5Fget_access_plist</a>
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</ul>
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</td></tr>
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</table>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="File-Open">H5Fopen</a>
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<dt><strong>Signature:</strong>
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<dd><em>hid_t </em><code>H5Fopen</code>(<em>const char *</em><code>name</code>,
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<em>unsigned</em> <code>flags</code>,
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<em>hid_t</em> <code>access_id</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Opens an existing file.
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<dt><strong>Description:</strong>
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<dd><code>H5Fopen</code> opens an existing file and is the primary
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function for accessing existing HDF5 files.
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<p>
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The parameter <code>access_id</code> is a file access property
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list identifier or <code>H5P_DEFAULT</code> for the default I/O access
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parameters.
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<p>
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The <code>flags</code> argument determines whether writing
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to an existing file will be allowed or not.
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The file is opened with read and write permission if
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<code>flags</code> is set to <code>H5F_ACC_RDWR</code>.
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All flags may be combined with the bit-wise OR operator (`|')
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to change the behavior of the file open call.
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The more complex behaviors of a file's access are controlled
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through the file-access property list.
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<p>
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Files which are opened more than once return a unique identifier
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for each <code>H5Fopen()</code> call and can be accessed
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through all file identifiers.
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<p>
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The return value is a file identifier for the open file and it
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should be closed by calling <code>H5Fclose()</code> when it is
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no longer needed.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>const char *</em><code>name</code>
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<dd>Name of the file to access.
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<dt><em>unsigned</em> <code>flags</code>
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<dd>File access flags. See the <code>H5Fcreate</code>
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parameters list for a list of possible values.
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<dt><em>hid_t</em> <code>access_id</code>
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<dd>Identifier for the file access properties list.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a file identifier if successful;
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otherwise FAIL (-1).
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="File-Create">H5Fcreate</a>
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<dt><strong>Signature:</strong>
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<dd><em>hid_t </em><code>H5Fcreate</code>(<em>const char *</em><code>name</code>,
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<em>unsigned</em> <code>flags</code>,
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<em>hid_t</em> <code>create_id</code>,
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<em>hid_t</em> <code>access_id</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Creates HDF5 files.
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<dt><strong>Description:</strong>
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<dd><code>H5Fcreate</code> is the primary function for creating
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HDF5 files .
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<p>
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The <code>flags</code> parameter determines whether an
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existing file will be overwritten. All newly created files
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are opened for both reading and writing. All flags may be
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combined with the bit-wise OR operator (`|') to change
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the behavior of the <code>H5Fcreate</code> call.
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<p>
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The more complex behaviors of file creation and access
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are controlled through the file-creation and file-access
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property lists. The value of <code>H5P_DEFAULT</code> for
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a property list value indicates that the library should use
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the default values for the appropriate property list. Also see
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<code>H5Fpublic.h</code> for the list of supported flags.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>const char *</em><code>name</code>
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<dd>Name of the file to access.
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<dt><em>uintn</em> <code>flags</code>
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<dd>File access flags. Possible values include:
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<ul><dl>
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<dt>H5F_ACC_RDWR
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<dd>Allow read and write access to file.
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<dt>H5F_ACC_RDONLY
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<dd>Allow read-only access to file.
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<dt>H5F_ACC_TRUNC
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<dd>Truncate file, if it already exists,
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erasing all data previously stored in the file.
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<dt>H5F_ACC_EXCL
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<dd>Fail if file already exists.
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<dt>H5F_ACC_DEBUG
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<dd>Print debug information.
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<dt>H5P_DEFAULT
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<dd>Apply default file access and creation properties.
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</dl></ul>
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<dt><em>hid_t</em> <code>create_id</code>
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<dd>File creation property list identifier, used when modifying
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default file meta-data.
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<dt><em>hid_t</em> <code>access_id</code>
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<dd>File access property list identifier.
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If parallel file access is desired, this is a collective
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call according to the communicator stored in the
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<code>access_id</code>.
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Use <code>0</code> for default access properties.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a file identifier if successful;
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otherwise FAIL (-1).
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="File-Flush">H5Fflush</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t </em><code>H5Fis_hdf5</code>(<em>hid_t </em><code>object_id</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Flushes all buffers associated with a file to disk.
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<dt><strong>Description:</strong>
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<dd><code>H5Fflush</code> causes all buffers associated with a
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file to be immediately flushed to disk without removing the
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data from the cache.
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<p>
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<code>object_id</code> can be any object associated with the file,
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including the file itself, a dataset, a group, an attribute, or
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a named data type.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>const char *</em><code>object_id</code>
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<dd>Identifier of object used to identify the file.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns SUCCEED (0) if successful;
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otherwise returns FAIL (-1).
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="File-IsHDF5">H5Fis_hdf5</a>
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<dt><strong>Signature:</strong>
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<dd><em>hbool_t </em><code>H5Fis_hdf5</code>(<em>const char *</em><code>name</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Determines whether a file is in the HDF5 format.
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<dt><strong>Description:</strong>
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<dd><code>H5Fis_hdf5</code> determines whether a file is in
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the HDF5 format.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>const char *</em><code>name</code>
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<dd>File name to check format.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns <code>TRUE</code> or <code>FALSE</code> if successful.
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Otherwise returns FAIL (-1).
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="File-GetCreatePlist">H5Fget_create_plist</a>
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<dt><strong>Signature:</strong>
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<dd><em>hid_t </em><code>H5Fget_create_plist</code>(<em>hid_t</em> <code>file_id</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Returns a file creation property list identifier.
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<dt><strong>Description:</strong>
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<dd><code>H5Fget_create_plist</code> returns a file creation
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property list identifier identifying the creation properties
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used to create this file. This function is useful for
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duplicating properties when creating another file.
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<p>
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See "File Creation Properties" in
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<a href="RM_H5P.html">H5P: Property List Interface</a>
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in this reference manual and
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"File Creation Properties"
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in <a href="Files.html"><cite>Files</cite></a> in the
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<cite>HDF5 User's Guide</cite> for
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additional information and related functions.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>hid_t</em> <code>file_id</code>
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<dd>Identifier of the file to get creation property list of
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a file creation property list identifier if successful;
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otherwise FAIL (-1).
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="File-GetAccessPlist">H5Fget_access_plist</a>
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<dt><strong>Signature:</strong>
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<dd><em>hid_t </em><code>H5Fget_access_plist</code>(<em>hid_t</em> <code>file_id</code>)
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<dt><strong>Purpose:</strong>
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<dd>Returns a file access property list identifier.
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<dt><strong>Description:</strong>
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<dd><code>H5Fget_access_plist</code> returns the
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file access property list identifier of the specified file.
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<p>
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See "File Access Properties" in
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<a href="RM_H5P.html">H5P: Property List Interface</a>
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in this reference manual and
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"File Access Property Lists"
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in <a href="Files.html"><cite>Files</cite></a> in the
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<cite>HDF5 User's Guide</cite> for
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additional information and related functions.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>hid_t</em> <code>file_id</code>
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<dd>Identifier of file to get access property list of
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns a file access property list identifier if successful;
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otherwise FAIL (-1).
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</dl>
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<hr>
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<dl>
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<dt><strong>Name:</strong> <a name="File-Close">H5Fclose</a>
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<dt><strong>Signature:</strong>
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<dd><em>herr_t </em><code>H5Fclose</code>(<em>hid_t</em> <code>file_id</code>
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)
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<dt><strong>Purpose:</strong>
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<dd>Terminates access to an HDF5 file.
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<dt><strong>Description:</strong>
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<dd><code>H5Fclose</code> terminates access to an HDF5 file.
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If this is the last file identifier open for a file
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and if access identifiers are still in use,
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this function will fail.
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<dt><strong>Parameters:</strong>
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<dl>
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<dt><em>hid_t</em> <code>file_id</code>
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<dd>Identifier of a file to terminate access to.
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</dl>
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<dt><strong>Returns:</strong>
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<dd>Returns SUCCEED (0) if successful;
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otherwise FAIL (-1).
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</dl>
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<hr>
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<center>
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<a href="RM_H5Front.html">HDF5 Reference Manual</a>
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<a href="RM_H5.html">H5</a>
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<a href="RM_H5A.html">H5A</a>
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<a href="RM_H5D.html">H5D</a>
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<a href="RM_H5E.html">H5E</a>
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H5F
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<a href="RM_H5G.html">H5G</a>
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<a href="RM_H5P.html">H5P</a>
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<a href="RM_H5S.html">H5S</a>
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<a href="RM_H5T.html">H5T</a>
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<a href="RM_H5Z.html">H5Z</a>
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<a href="Tools.html">Tools</a>
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<!--
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<a href="Glossary.html">Glossary</a>
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-->
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</center>
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<hr>
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<address>
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<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
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<br>
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Last modified: 14 August 1998
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</body>
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</html>
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