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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* Copyright by the Board of Trustees of the University of Illinois. *
* 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 files COPYING and Copyright.html. COPYING can be found at the root *
* of the source code distribution tree; Copyright.html can be found at the *
* root level of an installed copy of the electronic HDF5 document set and *
* is linked from the top-level documents page. It can also be found at *
* http://hdfgroup.org/HDF5/doc/Copyright.html. If you do not have *
* access to either file, you may request a copy from help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*
This example creates a file and writes a two dimensional real dataset
to it.
It then reopens the file and reads a region of data given a set
of corner coordinates.
Main illustrative function: H5LTread_region
*/
#include "hdf5.h"
#include "hdf5_hl.h"
#define filename "ex_lite_read_region.h5"
#define DSETNAME "DS" /* dataset name */
#define DIM0 5 /* dataset dimensions */
#define DIM1 4
#define RANK 2 /* dataset RANK */
int main(void)
{
hid_t file_id; /* file identifier */
hsize_t dims[RANK] = {DIM0, DIM1};
herr_t status;
float data[DIM0][DIM1];
int i, j;
hsize_t block_coord[4] ={ 2, 2, 4, 3};
float rdata[3][2];
/*********************************************************
This writes data to the HDF5 file.
*********************************************************/
/*
* Data initialization.
*/
printf("FULL 2D ARRAY:");
for (i=0; i<DIM0; i++) {
printf("\n[ ");
for (j=0; j<DIM1; j++) {
data[i][j] = (float)((DIM0-1)*i+j);
printf("%f ", data[i][j]);
}
printf("]");
}
printf("\n");
/*
* Create file with default file access and file creation properties.
*/
file_id = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/*
* Create and write the dataset.
*/
status = H5LTmake_dataset ( file_id, DSETNAME, 2, dims, H5T_NATIVE_FLOAT, data);
status = H5Fclose(file_id);
/*************************************************************
This reads a region of data given corner coordinates
************************************************************/
status = H5LTread_region(filename,
"/DS",
block_coord,
H5T_NATIVE_FLOAT,
rdata);
printf("REGION 2D HYPERSLAB BY CORNER COORDINATES ,");
printf(" COORDINATES (%d,%d)-(%d,%d):\n",(int)block_coord[0],(int)block_coord[1],
(int)block_coord[2],(int)block_coord[3]);
for (i=0; i< block_coord[2] - block_coord[0] + 1; i++)
{
printf("\n [ ");
for (j=0; j< block_coord[3] - block_coord[1] + 1; j++) {
printf("%f ", rdata[i][j]);
}
printf("]");
}
printf("\n");
return 0;
}
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