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