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https://github.com/HDFGroup/hdf5.git
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8597110837
- Appended h5tutr_ to names of data files to avoid name clashing with existing examples. - Added example dependencies to Makefile.* (pointed out by Allen) Platforms tested: SunOS 5.11 (emu) with gmake Linux/ppc64 (ostrich) Linux/32 2.6 (jam) Linux/64 2.6 (koala)/PGI compilers
184 lines
5.0 KiB
C++
184 lines
5.0 KiB
C++
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by The HDF Group. *
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* Copyright by the Board of Trustees of the University of Illinois. *
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* All rights reserved. *
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* *
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* This file is part of HDF5. The full HDF5 copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the files COPYING and Copyright.html. COPYING can be found at the root *
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* of the source code distribution tree; Copyright.html can be found at the *
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* root level of an installed copy of the electronic HDF5 document set and *
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* is linked from the top-level documents page. It can also be found at *
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* http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
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* access to either file, you may request a copy from help@hdfgroup.org. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/*
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* This example illustrates how to read/write a subset of data (a slab)
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* from/to a dataset in an HDF5 file. It is used in the HDF5 Tutorial.
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*/
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#include <iostream>
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#include <string>
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#include "H5Cpp.h"
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#ifndef H5_NO_NAMESPACE
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using namespace H5;
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#ifndef H5_NO_STD
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using std::cout;
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using std::endl;
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#endif // H5_NO_STD
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#endif
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const H5std_string FILE_NAME("h5tutr_subset.h5");
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const H5std_string DATASET_NAME("IntArray");
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const int RANK = 2;
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const int DIM0_SUB = 3; // subset dimensions
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const int DIM1_SUB = 4;
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const int DIM0 = 8; // size of dataset
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const int DIM1 = 10;
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int main (void)
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{
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int i,j;
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int data[DIM0][DIM1], sdata[DIM0_SUB][DIM1_SUB], rdata[DIM0][DIM1];
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// Try block to detect exceptions raised by any of the calls inside it
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try
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{
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// Turn off the auto-printing when failure occurs so that we can
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// handle the errors appropriately
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Exception::dontPrint();
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// ---------------------------------------------------
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// Create a new file using the default property lists.
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// Then create a dataset and write data to it.
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// Close the file and dataset.
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// ---------------------------------------------------
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H5File file(FILE_NAME, H5F_ACC_TRUNC);
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hsize_t dims[2];
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dims[0] = DIM0;
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dims[1] = DIM1;
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DataSpace dataspace = DataSpace (RANK, dims);
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DataSet dataset(file.createDataSet( DATASET_NAME,
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PredType::STD_I32BE, dataspace) );
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for (j = 0; j < DIM0; j++) {
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for (i = 0; i < DIM1; i++)
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if (i< (DIM1/2))
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data[j][i] = 1;
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else
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data[j][i] = 2;
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}
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dataset.write(data, PredType::NATIVE_INT);
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cout << endl << "Data Written to File:" << endl;
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for (j = 0; j < DIM0; j++) {
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for (i = 0; i < DIM1; i++)
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cout << " " << data[j][i];
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cout << endl;
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}
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dataspace.close();
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dataset.close();
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file.close();
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// ---------------------------------------------------
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// Reopen the file and dataset and write a subset of
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// values to the dataset.
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// ---------------------------------------------------
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hsize_t offset[2], count[2], stride[2], block[2];
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hsize_t dimsm[2];
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file.openFile(FILE_NAME, H5F_ACC_RDWR);
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dataset = file.openDataSet(DATASET_NAME);
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// Specify size and shape of subset to write.
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offset[0] = 1;
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offset[1] = 2;
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count[0] = DIM0_SUB;
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count[1] = DIM1_SUB;
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stride[0] = 1;
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stride[1] = 1;
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block[0] = 1;
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block[1] = 1;
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// Define Memory Dataspace. Get file dataspace and select
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// a subset from the file dataspace.
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dimsm[0] = DIM0_SUB;
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dimsm[1] = DIM1_SUB;
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DataSpace memspace(RANK, dimsm, NULL);
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dataspace = dataset.getSpace();
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dataspace.selectHyperslab(H5S_SELECT_SET, count, offset, stride, block);
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// Write a subset of data to the dataset, then read the
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// entire dataset back from the file.
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cout << endl << "Write subset to file specifying: " << endl;
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cout << " offset=1x2 stride=1x1 count=3x4 block=1x1" << endl;
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for (j = 0; j < DIM0_SUB; j++) {
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for (i = 0; i < DIM1_SUB; i++)
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sdata[j][i] = 5;
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}
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dataset.write(sdata, PredType::NATIVE_INT, memspace, dataspace);
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dataset.read(rdata, PredType::NATIVE_INT);
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cout << endl << "Data in File after Subset is Written:" << endl;
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for (i = 0; i < DIM0; i++) {
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for (j = 0; j < DIM1; j++)
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cout << " " << rdata[i][j];
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cout << endl;
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}
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cout << endl;
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// It is not necessary to close these objects because close() will
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// be called when the object instances are going out of scope.
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dataspace.close();
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memspace.close();
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dataset.close();
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file.close();
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} // end of try block
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// catch failure caused by the H5File operations
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catch(FileIException error)
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{
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error.printError();
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return -1;
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}
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// catch failure caused by the DataSet operations
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catch(DataSetIException error)
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{
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error.printError();
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return -1;
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}
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// catch failure caused by the DataSpace operations
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catch(DataSpaceIException error)
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{
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error.printError();
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return -1;
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}
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return 0; // successfully terminated
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}
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