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Diffstat (limited to 'examples')
-rw-r--r-- | examples/Attributes.txt | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/examples/Attributes.txt b/examples/Attributes.txt new file mode 100644 index 0000000..8d090fc --- /dev/null +++ b/examples/Attributes.txt @@ -0,0 +1,140 @@ +Attribute Examples: + +H5Acreate example: Show how to create an attribute for a dataset and a group +---------------- +{ + hid_t file; + hid_t group; + hid_t dataset; + hid_t attr; + hid_t dataspace; + int32 attr_data; + int rank; + size_t dimsf[2]; + + /* Open the file */ + file=H5Fopen("example.h5", H5F_ACC_RDWR, H5P_DEFAULT); + + /* Describe the size of the array and create the data space */ + rank=2; + dimsf[0] = H5S_UNLIMITED; + dimsf[1] = H5S_UNLIMITED; + dataspace = H5Screate_simple(rank, dimsf, NULL); + + /* Create a dataset */ + dataset=H5Dcreate(file,"Dataset1",H5T_UINT8,dataspace,H5P_DEFAULT); + + <Write data to first dataset> + + /* Create an attribute for the dataset */ + attr=H5Acreate(dataset,"Attr1",H5T_INT32,H5S_SCALAR,H5P_DEFAULT); + + /* Write attribute information */ + H5Awrite(attr,H5T_INT32,&attr_data); + + /* Close attribute */ + H5Aclose(attr); + + /* Close dataset */ + H5Dclose(dataset); + + /* Create a group */ + group=H5Gcreate(file,"/Group One",0); + + /* Create an attribute for the dataset */ + attr=H5Acreate(group,"Attr1",H5T_INT32,H5S_SCALAR,H5P_DEFAULT); + + /* Write attribute information */ + H5Awrite(attr,H5T_INT32,&attr_data); + + /* Close attribute */ + H5Aclose(attr); + + /* Close the group */ + H5Gclose(group); + + /* Close file */ + H5Fclose(file); +} + + +H5Aiterate example: Print all the names of attributes of a dataset, without + any buffers. +--------------------- + +herr_t print_names (hid_t loc_id, const char *name, void *opdata) +{ + puts (name); + return 0; +} + +{ + H5Aiterate (dataset_or_group_id, NULL, print_names, NULL); +} + + +H5Aread Example: Attach to an attribute of a dataset and read in attr. data +---------------- +{ + hid_t file; + hid_t dataset; + hid_t attr; + int32 attr_data; + + /* Open the file */ + file=H5Fopen("example.h5", H5F_ACC_RDWR, H5P_DEFAULT); + + /* Open the dataset */ + dataset=H5Dopen(file,"Dataset1"); + + /* Get the OID of the attribute */ + attr=H5Aopen_name(dataset,"Attr1"); + + /* Read attribute */ + H5Aread(attr,H5T_INT32,attr_data); + + /* Close attribute dataset */ + H5Aclose(attr); + + /* Close first dataset */ + H5Dclose(dataset); + + /* Close file */ + H5Fclose(file); +} + +H5Alink Example: Shows how to share an attribute between two datasets. +---------------- +{ + hid_t file; + hid_t dataset1, dataset2; + hid_t attr; + + /* Open the file */ + file=H5Fopen("example.h5", H5F_ACC_RDWR, H5P_DEFAULT); + + /* Open the first dataset */ + dataset1=H5Dopen(file,"Dataset1"); + + /* Open the first dataset */ + dataset2=H5Dopen(file,"Dataset2"); + + /* Get the OID of the attribute */ + attr=H5Aopen_name(dataset1,"Foo"); + + /* + * Create an attribute in the second dataset to the attribute in dataset1, + * changing the name of the attribute information in dataset2. + */ + H5Alink(dataset2, attr, "Bar"); + + /* Close attribute dataset */ + H5Aclose(attr); + + /* Close datasets */ + H5Dclose(dataset1); + H5Dclose(dataset2); + + /* Close file */ + H5Fclose(file); +} |