mirror of
https://github.com/HDFGroup/hdf5.git
synced 2024-11-21 01:04:10 +08:00
0e06a92d0e
Changed H5Acreate2 -> H5Acreate_by_name, to be more consistent with
other new API routines.
Re-added simpler form of H5Acreate2, which creates attributes directly
on an object.
Tested on:
FreeBSD/32 6.2 (duty) in debug mode
FreeBSD/64 6.2 (liberty) w/C++ & FORTRAN, in debug mode
Linux/32 2.6 (kagiso) w/PGI compilers, w/C++ & FORTRAN, w/threadsafe,
in debug mode
Linux/64-amd64 2.6 (smirom) w/default API=1.6.x, w/C++ & FORTRAN,
in production mode
Linux/64-ia64 2.6 (cobalt) w/Intel compilers, w/C++ & FORTRAN,
in production mode
Solaris/32 2.10 (linew) w/deprecated symbols disabled, w/C++ & FORTRAN,
w/szip filter, in production mode
Mac OS X/32 10.4.10 (amazon) in debug mode
141 lines
3.2 KiB
Plaintext
141 lines
3.2 KiB
Plaintext
Attribute Examples:
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H5Acreate2 example: Show how to create an attribute for a dataset and a group
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----------------
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{
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hid_t file;
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hid_t group;
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hid_t dataset;
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hid_t attr;
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hid_t dataspace;
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int32 attr_data;
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int rank;
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size_t dimsf[2];
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/* Open the file */
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file=H5Fopen("example.h5", H5F_ACC_RDWR, H5P_DEFAULT);
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/* Describe the size of the array and create the data space */
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rank=2;
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dimsf[0] = H5S_UNLIMITED;
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dimsf[1] = H5S_UNLIMITED;
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dataspace = H5Screate_simple(rank, dimsf, NULL);
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/* Create a dataset */
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dataset = H5Dcreate2(file, "Dataset1", H5T_UINT8, dataspace, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
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<Write data to first dataset>
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/* Create an attribute for the dataset */
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attr = H5Acreate2(dataset, "Attr1", H5T_INT32, H5S_SCALAR, H5P_DEFAULT, H5P_DEFAULT);
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/* Write attribute information */
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H5Awrite(attr, H5T_INT32, &attr_data);
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/* Close attribute */
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H5Aclose(attr);
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/* Close dataset */
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H5Dclose(dataset);
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/* Create a group */
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group = H5Gcreate2(file, "/Group One", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
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/* Create an attribute for the dataset */
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attr = H5Acreate2(group, "Attr1", H5T_INT32, H5S_SCALAR, H5P_DEFAULT, H5P_DEFAULT);
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/* Write attribute information */
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H5Awrite(attr, H5T_INT32, &attr_data);
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/* Close attribute */
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H5Aclose(attr);
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/* Close the group */
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H5Gclose(group);
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/* Close file */
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H5Fclose(file);
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}
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H5Aiterate example: Print all the names of attributes of a dataset, without
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any buffers.
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---------------------
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herr_t print_names (hid_t loc_id, const char *name, void *opdata)
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{
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puts (name);
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return 0;
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}
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{
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H5Aiterate (dataset_or_group_id, NULL, print_names, NULL);
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}
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H5Aread Example: Attach to an attribute of a dataset and read in attr. data
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----------------
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{
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hid_t file;
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hid_t dataset;
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hid_t attr;
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int32 attr_data;
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/* Open the file */
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file=H5Fopen("example.h5", H5F_ACC_RDWR, H5P_DEFAULT);
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/* Open the dataset */
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dataset=H5Dopen2(file, "Dataset1", H5P_DEFAULT);
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/* Get the OID of the attribute */
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attr=H5Aopen(dataset, "Attr1", H5P_DEFAULT);
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/* Read attribute */
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H5Aread(attr,H5T_INT32,attr_data);
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/* Close attribute dataset */
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H5Aclose(attr);
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/* Close first dataset */
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H5Dclose(dataset);
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/* Close file */
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H5Fclose(file);
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}
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H5Alink Example: Shows how to share an attribute between two datasets.
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----------------
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{
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hid_t file;
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hid_t dataset1, dataset2;
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hid_t attr;
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/* Open the file */
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file=H5Fopen("example.h5", H5F_ACC_RDWR, H5P_DEFAULT);
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/* Open the first dataset */
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dataset1=H5Dopen2(file, "Dataset1", H5P_DEFAULT);
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/* Open the first dataset */
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dataset2=H5Dopen2(file, "Dataset2", H5P_DEFAULT);
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/* Get the OID of the attribute */
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attr=H5Aopen(dataset1, "Foo", H5P_DEFAULT);
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/*
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* Create an attribute in the second dataset to the attribute in dataset1,
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* changing the name of the attribute information in dataset2.
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*/
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H5Alink(dataset2, attr, "Bar");
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/* Close attribute dataset */
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H5Aclose(attr);
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/* Close datasets */
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H5Dclose(dataset1);
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H5Dclose(dataset2);
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/* Close file */
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H5Fclose(file);
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}
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