1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
|
<html>
<head><title>
HDF5/H5D Draft API Specification
</title></head>
<body>
<hr>
<center>
<a href="RM_H5Front.html">HDF5 Reference Manual</a>
<a href="RM_H5.html">H5</a>
<a href="RM_H5A.html">H5A</a>
H5D
<a href="RM_H5E.html">H5E</a>
<a href="RM_H5F.html">H5F</a>
<a href="RM_H5G.html">H5G</a>
<a href="RM_H5P.html">H5P</a>
<a href="RM_H5S.html">H5S</a>
<a href="RM_H5T.html">H5T</a>
<a href="RM_H5Z.html">H5Z</a>
<a href="Tools.html">Tools</a>
<!--
<a href="Glossary.html">Glossary</a>
-->
</center>
<hr>
<center>
<h1>H5D: Datasets Interface</h1>
</center>
<h2>Dataset Object API Functions</h2>
These functions create and manipulate dataset objects,
and set and retrieve their constant or persistent properties.
<table border=0>
<tr><td valign=top>
<ul>
<li><a href="#Dataset-Create">H5Dcreate</a>
<li><a href="#Dataset-Open">H5Dopen</a>
<li><a href="#Dataset-GetSpace">H5Dget_space</a>
</ul>
</td><td> </td><td valign=top>
<ul>
<li><a href="#Dataset-GetType">H5Dget_type</a>
<li><a href="#Dataset-GetCreatePlist">H5Dget_create_plist</a>
<li><a href="#Dataset-Read">H5Dread</a>
</ul>
</td><td> </td><td valign=top>
<ul>
<li><a href="#Dataset-Write">H5Dwrite</a>
<li><a href="#Dataset-Extend">H5Dextend</a>
<li><a href="#Dataset-Close">H5Dclose</a>
</ul>
</td></tr>
</table>
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Dataset-Create">H5Dcreate</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t </em><code>H5Dcreate</code>(<em>hid_t </em><code>loc_id</code>,
<em>const char *</em><code>name</code>,
<em>hid_t</em><code>type_id</code>,
<em>hid_t</em><code>space_id</code>,
<em>hid_t</em><code>create_plist_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Creates a dataset at the specified location.
<dt><strong>Description:</strong>
<dd><code>H5Dcreate</code> creates a data set with a name,
<code>name</code>, in the file or in the group specified by
the identifier <code>loc_id</code>.
The dataset has the datatype and dataspace identified by
<code>type_id</code> and <code>space_id</code>, respectively.
The specified datatype and dataspace are the datatype and
dataspace of the dataset as it will exist in the file,
which may be different than in application memory.
Dataset creation properties are specified by the argument
<code>create_plist_id</code>.
<p>
<code>create_plist_id</code> is a <code>H5P_DATASET_CREATE</code>
property list created with <code>H5Pcreate()</code> and
initialized with the various functions described above.
<code>H5Dcreate()</code> returns a dataset identifier for success
or negative for failure. The identifier should eventually be
closed by calling <code>H5Dclose()</code> to release resources
it uses.
<dt><strong>Parameters:</strong>
<dl>
<dt><em>hid_t</em> <code>loc_id</code>
<dd>Identifier of the file or group to create the dataset within.
<dt><em>const char *</em> <code>name</code>
<dd>The name of the dataset to create.
<dt><em>hid_t</em> <code>type_id</code>
<dd>Identifier of the datatype to use when creating the dataset.
<dt><em>hid_t</em> <code>space_id</code>
<dd>Identifier of the dataspace to use when creating the dataset.
<dt><em>hid_t</em> <code>create_plist_id</code>
<dd>Identifier of the set creation property list.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns a dataset identifier if successful;
otherwise FAIL (-1).
</dl>
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Dataset-Open">H5Dopen</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t </em><code>H5Dopen</code>(<em>hid_t </em><code>loc_id</code>,
<em>const char *</em><code>name</code>
)
<dt><strong>Purpose:</strong>
<dd>Opens an existing dataset.
<dt><strong>Description:</strong>
<dd><code>H5Dopen</code> opens an existing dataset for access in the file
or group specified in <code>loc_id</code>. <code>name</code> is
a dataset name and is used to identify the dataset in the file.
<dt><strong>Parameters:</strong>
<dl>
<dt><em>hid_t</em> <code>loc_id</code>
<dd>Identifier of the file to access the dataset within.
<dt><em>const char *</em> <code>name</code>
<dd>The name of the dataset to access.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns a dataset identifier if successful;
otherwise FAIL (-1).
</dl>
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Dataset-GetSpace">H5Dget_space</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t </em><code>H5Dget_space</code>(<em>hid_t </em><code>dataset_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns an identifier for a copy of the dataspace for a dataset.
<dt><strong>Description:</strong>
<dd><code>H5Dget_space</code> returns an identifier for a copy of the
dataspace for a dataset.
The dataspace identifier should be released with the
<code>H5Sclose()</code> function.
<dt><strong>Parameters:</strong>
<dl>
<dt><em>hid_t</em> <code>dataset_id</code>
<dd>Identifier of the dataset to query.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns a dataspace identifier if successful;
otherwise FAIL (-1).
</dl>
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Dataset-GetType">H5Dget_type</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t </em><code>H5Dget_type</code>(<em>hid_t </em><code>dataset_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns an identifier for a copy of the datatype for a dataset.
<dt><strong>Description:</strong>
<dd><code>H5Dget_type</code> returns an identifier for a copy of the
datatype for a dataset.
The datatype should be released with the <code>H5Tclose()</code> function.
<p>
If a dataset has a named datatype, then an identifier to the
opened datatype is returned.
Otherwise, the returned datatype is read-only.
If atomization of the datatype fails, then the datatype is closed.
<dt><strong>Parameters:</strong>
<dl>
<dt><em>hid_t</em> <code>dataset_id</code>
<dd>Identifier of the dataset to query.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns a datatype identifier if successful;
otherwise FAIL (-1).
</dl>
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Dataset-GetCreatePlist">H5Dget_create_plist</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t </em><code>H5Dget_create_plist</code>(<em>hid_t </em><code>dataset_id</code>
)
<dt><strong>Purpose:</strong>
<dd>Returns an identifier for a copy of the
dataset creation property list for a dataset.
<dt><strong>Description:</strong>
<dd><code>H5Dget_create_plist</code> returns an identifier for a
copy of the dataset creation property list for a dataset.
The creation property list identifier should be released with
the <code>H5Pclose()</code> function.
<dt><strong>Parameters:</strong>
<dl>
<dt><em>hid_t</em> <code>dataset_id</code>
<dd>Identifier of the dataset to query.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns a dataset creation property list identifier if successful;
otherwise FAIL (-1).
</dl>
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Dataset-Read">H5Dread</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Dread</code>(<em>hid_t </em><code>dataset_id</code>,
<em>hid_t</em> <code>mem_type_id</code>,
<em>hid_t</em> <code>mem_space_id</code>,
<em>hid_t</em> <code>file_space_id</code>,
<em>hid_t</em> <code>xfer_plist_id</code>,
<em>void *</em> <code>buf</code>
)
<dt><strong>Purpose:</strong>
<dd>Reads raw data from the specified dataset into <code>buf</code>,
converting from file datatype and dataspace to
memory datatype and dataspace.
<dt><strong>Description:</strong>
<dd><code>H5Dread</code> reads a (partial) dataset, specified by its
identifier <code>dataset_id</code>, from the file into the
application memory buffer <code>buf</code>.
Data transfer properties are defined by the argument
<code>xfer_plist_id</code>.
The memory datatype of the (partial) dataset is identified by
the identifier <code>mem_type_id</code>.
The part of the dataset to read is defined by
<code>mem_space_id</code> and <code>file_space_id</code>.
<p>
<code>file_space_id</code> can be the constant <code>H5S_ALL</code>,
which indicates that the entire file data space is to be referenced.
<p>
<code>mem_space_id</code> can be the constant <code>H5S_ALL</code>,
in which case the memory data space is the same as the file data space
defined when the dataset was created.
<p>
The number of elements in the memory data space must match
the number of elements in the file data space.
<p>
<code>xfer_plist_id</code> can be the constant <code>H5P_DEFAULT</code>,
in which case the default data transfer properties are used.
<p>
Datatype conversion takes place at the time of a read or write
and is automatic. See the
<a href="Datatypes.html#Datatypes-DataConversion">Data Conversion</a>
section of <cite>The Data Type Interface (H5T)</cite> in the
<cite>HDF5 User's Guide</cite> for a discussion of
data conversion, including the range of conversions currently
supported by the HDF5 libraries.
<dt><strong>Parameters:</strong>
<dl>
<dt><em>hid_t</em> <code>dataset_id</code>
<dd>Identifier of the dataset read from.
<dt><em>hid_t</em> <code>mem_type_id</code>
<dd>Identifier of the memory datatype.
<dt><em>hid_t</em> <code>mem_space_id</code>
<dd>Identifier of the memory dataspace.
<dt><em>hid_t</em> <code>file_space_id</code>
<dd>Identifier of the dataset's dataspace in the file.
<dt><em>hid_t</em> <code>xfer_plist_id</code>
<dd>Identifier of a transfer property list for this I/O operation.
<dt><em>void *</em> <code>buf</code>
<dd>Buffer to store data read from the file.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns SUCCEED (0) if successful;
otherwise FAIL (-1).
</dl>
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Dataset-Write">H5Dwrite</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Dwrite</code>(<em>hid_t </em><code>dataset_id</code>,
<em>hid_t</em> <code>mem_type_id</code>,
<em>hid_t</em> <code>mem_space_id</code>,
<em>hid_t</em> <code>file_space_id</code>,
<em>hid_t</em> <code>xfer_plist_id</code>,
<em>const void *</em> <code>buf</code>
)
<dt><strong>Purpose:</strong>
<dd>Writes raw data from an application buffer <code>buf</code> to
the specified dataset, converting from
memory datatype and dataspace to file datatype and dataspace.
<dt><strong>Description:</strong>
<dd><code>H5Dwrite</code> writes a (partial) dataset, specified by its
identifier <code>dataset_id</code>, from the
application memory buffer <code>buf</code> into the file.
Data transfer properties are defined by the argument
<code>xfer_plist_id</code>.
The memory datatype of the (partial) dataset is identified by
the identifier <code>mem_type_id</code>.
The part of the dataset to write is defined by
<code>mem_space_id</code> and <code>file_space_id</code>.
<p>
<code>file_space_id</code> can be the constant <code>H5S_ALL</code>.
which indicates that the entire file data space is to be referenced.
<p>
<code>mem_space_id</code> can be the constant <code>H5S_ALL</code>,
in which case the memory data space is the same as the file data space
defined when the dataset was created.
<p>
The number of elements in the memory data space must match
the number of elements in the file data space.
<p>
<code>xfer_plist_id</code> can be the constant <code>H5P_DEFAULT</code>.
in which case the default data transfer properties are used.
<p>
Writing to an external dataset will fail if the HDF5 file is
not open for writing.
<p>
Datatype conversion takes place at the time of a read or write
and is automatic. See the
<a href="Datatypes.html#Datatypes-DataConversion">Data Conversion</a>
section of <cite>The Data Type Interface (H5T)</cite> in the
<cite>HDF5 User's Guide</cite> for a discussion of
data conversion, including the range of conversions currently
supported by the HDF5 libraries.
<dt><strong>Parameters:</strong>
<dl>
<dt><em>hid_t</em> <code>dataset_id</code>
<dd>Identifier of the dataset read from.
<dt><em>hid_t</em> <code>mem_type_id</code>
<dd>Identifier of the memory datatype.
<dt><em>hid_t</em> <code>mem_space_id</code>
<dd>Identifier of the memory dataspace.
<dt><em>hid_t</em> <code>file_space_id</code>
<dd>Identifier of the dataset's dataspace in the file.
<dt><em>hid_t</em> <code>xfer_plist_id</code>
<dd>Identifier of a transfer property list for this I/O operation.
<dt><em>const void *</em> <code>buf</code>
<dd>Buffer with data to be written to the file.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns SUCCEED (0) if successful;
otherwise FAIL (-1).
</dl>
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Dataset-Extend">H5Dextend</a>
<dt><strong>Signature:</strong>
<dd><em>herr_t </em><code>H5Dextend</code>(<em>hid_t </em><code>dataset_id</code>,
<em>const hsize_t *</em> <code>size</code>
)
<dt><strong>Purpose:</strong>
<dd>Extends a dataset with unlimited dimension.
<dt><strong>Description:</strong>
<dd><code>H5Dextend</code> verifies that the dataset is at least of size
<code>size</code>.
The dimensionality of <code>size</code> is the same as that of
the dataspace of the dataset being changed.
This function cannot be applied to a dataset with fixed dimensions.
<dt><strong>Parameters:</strong>
<dl>
<dt><em>hid_t</em> <code>dataset_id</code>
<dd>Identifier of the dataset.
<dt><em>const hsize_t *</em> <code>size</code>
<dd>Array containing the new magnitude of each dimension.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns SUCCEED (0) if successful;
otherwise FAIL (-1).
</dl>
<hr>
<dl>
<dt><strong>Name:</strong> <a name="Dataset-Close">H5Dclose</a>
<dt><strong>Signature:</strong>
<dd><em>hid_t </em><code>H5Dclose</code>(<em>hid_t </em><code>dataset_id</code>
)
<dt><strong>Purpose:</strong>
<dd>
<dt><strong>Description:</strong>
<dd><code>H5Dclose</code> ends access to a dataset specified by
<code>dataset_id</code> and releases resources used by it.
Further use of the dataset identifier is illegal in calls to
the dataset API.
<dt><strong>Parameters:</strong>
<dl>
<dt><em>hid_t</em> <code>dataset_id</code>
<dd>Identifier of the dataset to finish access to.
</dl>
<dt><strong>Returns:</strong>
<dd>Returns SUCCEED (0) if successful;
otherwise FAIL (-1).
</dl>
<hr>
<center>
<a href="RM_H5Front.html">HDF5 Reference Manual</a>
<a href="RM_H5.html">H5</a>
<a href="RM_H5A.html">H5A</a>
H5D
<a href="RM_H5E.html">H5E</a>
<a href="RM_H5F.html">H5F</a>
<a href="RM_H5G.html">H5G</a>
<a href="RM_H5P.html">H5P</a>
<a href="RM_H5S.html">H5S</a>
<a href="RM_H5T.html">H5T</a>
<a href="RM_H5Z.html">H5Z</a>
<a href="Tools.html">Tools</a>
<!--
<a href="Glossary.html">Glossary</a>
-->
</center>
<hr>
<address>
<a href="mailto:hdfhelp@ncsa.uiuc.edu">HDF Help Desk</a>
<br>
Last modified: 12 August 1998
</body>
</html>
|
