hdf5/examples/h5_crtgrpd.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * 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://support.hdfgroup.org/ftp/HDF5/releases.  *
 * 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);
}