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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* 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 that is a 4 x 6
* array. It is used in the HDF5 Tutorial.
*/
#include <iostream>
using std::cout;
using std::endl;
#include <string>
#include "H5Cpp.h"
using namespace H5;
const H5std_string FILE_NAME("h5tutr_extend.h5");
const H5std_string DATASETNAME("ExtendibleArray");
int
main(void)
{
hsize_t dims[2] = {3, 3}; // dataset dimensions at creation
hsize_t maxdims[2] = {H5S_UNLIMITED, H5S_UNLIMITED};
hsize_t chunk_dims[2] = {2, 5};
int data[3][3] = {{1, 1, 1}, // data to write
{1, 1, 1},
{1, 1, 1}};
// Variables used in extending and writing to the extended portion of dataset
hsize_t size[2];
hsize_t offset[2];
hsize_t dimsext[2] = {7, 3}; // extend dimensions
int dataext[7][3] = {{2, 3, 4}, {2, 3, 4}, {2, 3, 4}, {2, 3, 4}, {2, 3, 4}, {2, 3, 4}, {2, 3, 4}};
// Try block to detect 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();
// Create a new file using the default property lists.
H5File file(FILE_NAME, H5F_ACC_TRUNC);
// Create the data space for the dataset. Note the use of pointer
// for the instance 'dataspace'. It can be deleted and used again
// later for another dataspace. An HDF5 identifier can be closed
// by the destructor or the method 'close()'.
DataSpace *dataspace = new DataSpace(2, dims, maxdims);
// Modify dataset creation property to enable chunking
DSetCreatPropList prop;
prop.setChunk(2, chunk_dims);
// Create the chunked dataset. Note the use of pointer.
DataSet *dataset =
new DataSet(file.createDataSet(DATASETNAME, PredType::STD_I32BE, *dataspace, prop));
// Write data to dataset.
dataset->write(data, PredType::NATIVE_INT);
// Extend the dataset. Dataset becomes 10 x 3.
size[0] = dims[0] + dimsext[0];
size[1] = dims[1];
dataset->extend(size);
// Select a hyperslab in extended portion of the dataset.
DataSpace *filespace = new DataSpace(dataset->getSpace());
offset[0] = 3;
offset[1] = 0;
filespace->selectHyperslab(H5S_SELECT_SET, dimsext, offset);
// Define memory space.
DataSpace *memspace = new DataSpace(2, dimsext, NULL);
// Write data to the extended portion of the dataset.
dataset->write(dataext, PredType::NATIVE_INT, *memspace, *filespace);
// Close all objects and file.
prop.close();
delete filespace;
delete memspace;
delete dataspace;
delete dataset;
file.close();
// ---------------------------------------
// Re-open the file and read the data back
// ---------------------------------------
int rdata[10][3];
int i, j, rank, rank_chunk;
hsize_t chunk_dimsr[2], dimsr[2];
// Open the file and dataset.
file.openFile(FILE_NAME, H5F_ACC_RDONLY);
dataset = new DataSet(file.openDataSet(DATASETNAME));
// Get the dataset's dataspace and creation property list.
filespace = new DataSpace(dataset->getSpace());
prop = dataset->getCreatePlist();
// Get information to obtain memory dataspace.
rank = filespace->getSimpleExtentNdims();
herr_t status_n = filespace->getSimpleExtentDims(dimsr);
if (H5D_CHUNKED == prop.getLayout())
rank_chunk = prop.getChunk(rank, chunk_dimsr);
cout << "rank chunk = " << rank_chunk << endl;
;
memspace = new DataSpace(rank, dimsr, NULL);
dataset->read(rdata, PredType::NATIVE_INT, *memspace, *filespace);
cout << endl;
for (j = 0; j < dimsr[0]; j++) {
for (i = 0; i < dimsr[1]; i++)
cout << " " << rdata[j][i];
cout << endl;
}
// Close all objects and file.
prop.close();
delete filespace;
delete memspace;
delete dataset;
file.close();
} // end of try block
// catch failure caused by the H5File operations
catch (FileIException error) {
error.printErrorStack();
return -1;
}
// catch failure caused by the DataSet operations
catch (DataSetIException error) {
error.printErrorStack();
return -1;
}
// catch failure caused by the DataSpace operations
catch (DataSpaceIException error) {
error.printErrorStack();
return -1;
}
return 0; // successfully terminated
}
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