+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ #include <hdf5.h> #define FILE "groups.h5" main() { hid_t file_id, group_id, dataset_id, dataspace_id; /* identifiers */ hsize_t dims[2]; herr_t status; int i, j, dset1_data[3][3], dset2_data[2][10]; /* Initialize the first dataset. */ for (i = 0; i < 3; i++) for (j = 0; j < 3; j++) dset1_data[i][j] = j + 1; /* Initialize the second dataset. */ for (i = 0; i < 2; i++) for (j = 0; j < 10; j++) dset2_data[i][j] = j + 1; /* Open an existing file. */ file_id = H5Fopen(FILE, H5F_ACC_RDWR, H5P_DEFAULT); /* Create the data space for the first dataset. */ dims[0] = 3; dims[1] = 3; dataspace_id = H5Screate_simple(2, dims, NULL); /* Create a dataset in group "MyGroup". */ dataset_id = H5Dcreate(file_id, "/MyGroup/dset1", H5T_STD_I32BE, dataspace_id , H5P_DEFAULT); /* Write the first dataset. */ status = H5Dwrite(dataset_id, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, dset1_data); /* Close the data space for the first dataset. */ status = H5Sclose(dataspace_id); /* Close the first dataset. */ status = H5Dclose(dataset_id); /* Open an existing group of the specified file. */ group_id = H5Gopen(file_id, "/MyGroup/Group_A"); /* Create the data space for the second dataset. */ dims[0] = 2; dims[1] = 10; dataspace_id = H5Screate_simple(2, dims, NULL); /* Create the second dataset in group "Group_A". */ dataset_id = H5Dcreate(group_id, "dset2", H5T_STD_I32BE, dataspace_id, H5P_DEFAULT); /* Write the second dataset. */ status = H5Dwrite(dataset_id, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, dset2_data); /* Close the data space for the second dataset. */ status = H5Sclose(dataspace_id); /* Close the second dataset */ status = H5Dclose(dataset_id); /* Close the group. */ status = H5Gclose(group_id); /* Close the file. */ status = H5Fclose(file_id); } +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Fig. 10.1 The Contents of 'groups.h5'
Fig. 10.2 'groups.h5' in DDL
HDF5 "groups.h5" { GROUP "/" { GROUP "MyGroup" { GROUP "Group_A" { DATASET "dset2" { DATATYPE { H5T_STD_I32BE } DATASPACE { SIMPLE ( 2, 10 ) / ( 2, 10 ) } DATA { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 } } } GROUP "Group_B" { } DATASET "dset1" { DATATYPE { H5T_STD_I32BE } DATASPACE { SIMPLE ( 3, 3 ) / ( 3, 3 ) } DATA { 1, 2, 3, 1, 2, 3, 1, 2, 3 } } } } }