mirror of
https://github.com/HDFGroup/hdf5.git
synced 2024-12-03 02:32:04 +08:00
228 lines
7.1 KiB
C++
228 lines
7.1 KiB
C++
/*
|
|
* This program shows how the select_hyperslab and select_elements
|
|
* functions are used to write selected data from memory to the file.
|
|
* Program takes 48 elements from the linear buffer and writes them into
|
|
* the matrix using 3x2 blocks, (4,3) stride and (2,4) count.
|
|
* Then four elements of the matrix are overwritten with the new values and
|
|
* file is closed. Program reopens the file and reads and displays the result.
|
|
*/
|
|
|
|
#include <string>
|
|
#ifndef H5_NO_NAMESPACE
|
|
using namespace std;
|
|
#endif
|
|
|
|
#ifdef OLD_HEADER_FILENAME
|
|
#include <iostream.h>
|
|
#else
|
|
#include <iostream>
|
|
#endif
|
|
#include "H5Cpp.h"
|
|
|
|
#ifndef H5_NO_NAMESPACE
|
|
using namespace H5;
|
|
#endif
|
|
|
|
const string FILE_NAME( "Select.h5" );
|
|
const string DATASET_NAME( "Matrix in file" );
|
|
const int MSPACE1_RANK = 1; // Rank of the first dataset in memory
|
|
const int MSPACE1_DIM = 50; // Dataset size in memory
|
|
const int MSPACE2_RANK = 1; // Rank of the second dataset in memory
|
|
const int MSPACE2_DIM = 4; // Dataset size in memory
|
|
const int FSPACE_RANK = 2; // Dataset rank as it is stored in the file
|
|
const int FSPACE_DIM1 = 8; // Dimension sizes of the dataset as it is...
|
|
const int FSPACE_DIM2 = 12; // ...stored in the file
|
|
const int MSPACE_DIM1 = 8; // We will read dataset back from the file...
|
|
const int MSPACE_DIM2 = 12; // ...to the dataset in memory with these ...
|
|
// ...dataspace parameters
|
|
const int NPOINTS = 4; // Number of points that will be selected...
|
|
// ...and overwritten
|
|
|
|
int main (void)
|
|
{
|
|
/*
|
|
* Buffers' initialization.
|
|
*/
|
|
uint i,j;
|
|
int vector[MSPACE1_DIM];
|
|
vector[0] = vector[MSPACE1_DIM - 1] = -1;
|
|
for (i = 1; i < MSPACE1_DIM - 1; i++)
|
|
vector[i] = i;
|
|
|
|
int matrix[MSPACE_DIM1][MSPACE_DIM2];
|
|
for (i = 0; i < MSPACE_DIM1; i++)
|
|
{
|
|
for (j = 0; j < MSPACE_DIM2; j++)
|
|
matrix[i][j] = 0;
|
|
}
|
|
|
|
// Try block to detect exceptions raised by any of the calls inside it
|
|
try
|
|
{
|
|
//
|
|
//Create a file.
|
|
//
|
|
H5File* file = new H5File( FILE_NAME, H5F_ACC_TRUNC );
|
|
|
|
//
|
|
//Create dataspace for the dataset in the file.
|
|
//
|
|
hsize_t fdim[] = {FSPACE_DIM1, FSPACE_DIM2}; // dim sizes of ds (on disk)
|
|
DataSpace fspace( FSPACE_RANK, fdim );
|
|
|
|
//
|
|
// Create dataset and write it into the file.
|
|
//
|
|
DataSet* dataset = new DataSet(
|
|
file->createDataSet( DATASET_NAME, PredType::NATIVE_INT, fspace ));
|
|
dataset->write( matrix, PredType::NATIVE_INT );
|
|
|
|
//
|
|
// Select hyperslab for the dataset in the file, using 3x2 blocks,
|
|
// (4,3) stride and (2,4) count starting at the position (0,1).
|
|
//
|
|
hssize_t start[2]; // Start of hyperslab
|
|
hsize_t stride[2]; // Stride of hyperslab
|
|
hsize_t count[2]; // Block count
|
|
hsize_t block[2]; // Block sizes
|
|
start[0] = 0; start[1] = 1;
|
|
stride[0] = 4; stride[1] = 3;
|
|
count[0] = 2; count[1] = 4;
|
|
block[0] = 3; block[1] = 2;
|
|
fspace.selectHyperslab( H5S_SELECT_SET, count, start, stride, block);
|
|
|
|
//
|
|
// Create dataspace for the first dataset.
|
|
//
|
|
hsize_t dim1[] = {MSPACE1_DIM}; /* Dimension size of the first dataset
|
|
(in memory) */
|
|
DataSpace mspace1( MSPACE1_RANK, dim1 );
|
|
|
|
/*
|
|
* Select hyperslab.
|
|
* We will use 48 elements of the vector buffer starting at the
|
|
* second element. Selected elements are 1 2 3 . . . 48
|
|
*/
|
|
start[0] = 1;
|
|
stride[0] = 1;
|
|
count[0] = 48;
|
|
block[0] = 1;
|
|
mspace1.selectHyperslab( H5S_SELECT_SET, count, start, stride, block);
|
|
|
|
/*
|
|
* Write selection from the vector buffer to the dataset in the file.
|
|
*
|
|
* File dataset should look like this:
|
|
* 0 1 2 0 3 4 0 5 6 0 7 8
|
|
* 0 9 10 0 11 12 0 13 14 0 15 16
|
|
* 0 17 18 0 19 20 0 21 22 0 23 24
|
|
* 0 0 0 0 0 0 0 0 0 0 0 0
|
|
* 0 25 26 0 27 28 0 29 30 0 31 32
|
|
* 0 33 34 0 35 36 0 37 38 0 39 40
|
|
* 0 41 42 0 43 44 0 45 46 0 47 48
|
|
* 0 0 0 0 0 0 0 0 0 0 0 0
|
|
*/
|
|
dataset->write( vector, PredType::NATIVE_INT, mspace1, fspace );
|
|
|
|
/*
|
|
* Reset the selection for the file dataspace fid.
|
|
*/
|
|
fspace.selectNone();
|
|
|
|
/*
|
|
* Create dataspace for the second dataset.
|
|
*/
|
|
hsize_t dim2[] = {MSPACE2_DIM}; /* Dimension size of the second dataset
|
|
(in memory */
|
|
DataSpace mspace2( MSPACE2_RANK, dim2 );
|
|
|
|
/*
|
|
* Select sequence of NPOINTS points in the file dataspace.
|
|
*/
|
|
hssize_t coord[NPOINTS][FSPACE_RANK]; /* Array to store selected points
|
|
from the file dataspace */
|
|
coord[0][0] = 0; coord[0][1] = 0;
|
|
coord[1][0] = 3; coord[1][1] = 3;
|
|
coord[2][0] = 3; coord[2][1] = 5;
|
|
coord[3][0] = 5; coord[3][1] = 6;
|
|
|
|
fspace.selectElements( H5S_SELECT_SET, NPOINTS, (const hssize_t **)coord);
|
|
|
|
/*
|
|
* Write new selection of points to the dataset.
|
|
*/
|
|
int values[] = {53, 59, 61, 67}; /* New values to be written */
|
|
dataset->write( values, PredType::NATIVE_INT, mspace2, fspace );
|
|
|
|
/*
|
|
* File dataset should look like this:
|
|
* 53 1 2 0 3 4 0 5 6 0 7 8
|
|
* 0 9 10 0 11 12 0 13 14 0 15 16
|
|
* 0 17 18 0 19 20 0 21 22 0 23 24
|
|
* 0 0 0 59 0 61 0 0 0 0 0 0
|
|
* 0 25 26 0 27 28 0 29 30 0 31 32
|
|
* 0 33 34 0 35 36 67 37 38 0 39 40
|
|
* 0 41 42 0 43 44 0 45 46 0 47 48
|
|
* 0 0 0 0 0 0 0 0 0 0 0 0
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Close the dataset and the file.
|
|
*/
|
|
delete dataset;
|
|
delete file;
|
|
|
|
/*
|
|
* Open the file.
|
|
*/
|
|
file = new H5File( FILE_NAME, H5F_ACC_RDONLY );
|
|
|
|
/*
|
|
* Open the dataset.
|
|
*/
|
|
dataset = new DataSet( file->openDataSet( DATASET_NAME ));
|
|
|
|
/*
|
|
* Read data back to the buffer matrix.
|
|
*/
|
|
dataset->read( matrix, PredType::NATIVE_INT );
|
|
|
|
/*
|
|
* Display the result.
|
|
*/
|
|
for (i=0; i < MSPACE_DIM1; i++)
|
|
{
|
|
for(j=0; j < MSPACE_DIM2; j++)
|
|
cout << matrix[i][j] << " ";
|
|
cout << endl;
|
|
}
|
|
|
|
/*
|
|
* Close the dataset and the file.
|
|
*/
|
|
delete dataset;
|
|
delete file;
|
|
} // end of try block
|
|
|
|
// catch failure caused by the H5File operations
|
|
catch( FileIException error )
|
|
{
|
|
error.printError();
|
|
}
|
|
|
|
// catch failure caused by the DataSet operations
|
|
catch( DataSetIException error )
|
|
{
|
|
error.printError();
|
|
}
|
|
|
|
// catch failure caused by the DataSpace operations
|
|
catch( DataSpaceIException error )
|
|
{
|
|
error.printError();
|
|
}
|
|
|
|
return 0;
|
|
}
|