hdf5/c++/examples/h5tutr_crtgrpd.cpp

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.						     *
 * Copyright by the Board of Trustees of the University of Illinois.	     *
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/*
 *  This example illustrates how to create a dataset in a group.
 *  It is used in the HDF5 Tutorial.
 */

#include <iostream>
#include <string>

#include "H5Cpp.h"

#ifndef H5_NO_NAMESPACE
    using namespace H5;
#ifndef H5_NO_STD
     using std::cout;
     using std::endl;
#endif  // H5_NO_STD
#endif

const H5std_string FILE_NAME("groups.h5");
const H5std_string DATASET_NAME1("/MyGroup/dset1");
const H5std_string DATASET_NAME2("dset2");
const int	RANK = 2;
const int	D1DIM1 = 3;
const int	D1DIM2 = 3;
const int	D2DIM1 = 2;
const int	D2DIM2 = 10;

int main(void)
{
    int dset1_data[D1DIM1][D1DIM2], dset2_data[D2DIM1][D2DIM2]; // data buffers
    int i, j;

    // Try block to catch exceptions raised by any of the calls inside it
    try
    {
	// Turn off the auto-printing when failure occurs so that we can
	// handle the errors appropriately
	Exception::dontPrint();

	// Initialize the first dataset. 
	for (i = 0; i < D1DIM1; i++)
	    for (j = 0; j < D1DIM2; j++)
	       dset1_data[i][j] = j + 1;

	//  Initialize the second dataset. 
	for (i = 0; i < D2DIM1; i++)
	  for (j = 0; j < D2DIM2; j++)
	      dset2_data[i][j] = j + 1;

	// Open an existing file and dataset.
	H5File file(FILE_NAME, H5F_ACC_RDWR);

        // Create the data space for the first dataset.  Note the use of
        // pointer for the instance 'dataspace'.  It can be deleted and
        // used again later for another data space.  An HDF5 identifier is
        // closed by the destructor or the method 'close()'.
	hsize_t dims[RANK];               // dataset dimensions
	dims[0] = D1DIM1;
	dims[1] = D1DIM2;
	DataSpace *dataspace = new DataSpace (RANK, dims);

	// Create the dataset in group "MyGroup".  Same note as for the
	// dataspace above.
	DataSet *dataset = new DataSet (file.createDataSet(DATASET_NAME1, 
	                                 PredType::STD_I32BE, *dataspace));

	// Write the data to the dataset using default memory space, file
	// space, and transfer properties.
	dataset->write(dset1_data, PredType::NATIVE_INT);

	// Close the current dataset and data space.
	delete dataset;
	delete dataspace;

	// Create the data space for the second dataset.
	dims[0] = D2DIM1;
	dims[1] = D2DIM2;
	dataspace = new DataSpace (RANK, dims);

	// Create group "Group_A" in group "MyGroup".
	Group group(file.openGroup("/MyGroup/Group_A"));

	// Create the second dataset in group "Group_A".
	dataset = new DataSet (group.createDataSet(DATASET_NAME2, 
	                                 PredType::STD_I32BE, *dataspace));

	// Write the data to the dataset using default memory space, file
	// space, and transfer properties.
	dataset->write(dset2_data, PredType::NATIVE_INT);

	// Close all objects.
	delete dataspace;
	delete dataset;
	group.close();
    
    } // end of try block

    // catch failure caused by the H5File operations
    catch(FileIException error)
    {
	 error.printError();
	 return -1;
    }
    // catch failure caused by the DataSet operations
    catch(DataSetIException error)
    {
	 error.printError();
	 return -1;
    }

    // catch failure caused by the DataSpace operations
    catch(DataSpaceIException error)
    {
	error.printError();
	return -1;
    }

    // catch failure caused by the Group operations
    catch(GroupIException error)
    {
	error.printError();
	return -1;
    }
 
     return 0;
}