hdf5/examples/h5_crtgrpd.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 *  This example illustrates how to create a dataset in a group.
 *  It is used in the HDF5 Tutorial.
 */

#include "hdf5.h"
#define FILE "groups.h5"

int
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 = H5Dcreate2(file_id, "/MyGroup/dset1", H5T_STD_I32BE, dataspace_id, H5P_DEFAULT, H5P_DEFAULT,
                            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 = H5Gopen2(file_id, "/MyGroup/Group_A", H5P_DEFAULT);

    /* 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 =
        H5Dcreate2(group_id, "dset2", H5T_STD_I32BE, dataspace_id, H5P_DEFAULT, H5P_DEFAULT, 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);
}