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/*
* This example reads hyperslab from the SDS.h5 file
* created by h5_write.c program into two-dimensional
* plane of the tree-dimensional array.
* Information about dataset in the SDS.h5 file is obtained.
*/
#include "hdf5.h"
#define FILE "SDS.h5"
#define DATASETNAME "IntArray"
#define NX_SUB 3 /* hyperslab dimensions */
#define NY_SUB 4
#define NX 7 /* output buffer dimensions */
#define NY 7
#define NZ 3
#define RANK 2
#define RANK_OUT 3
main ()
{
hid_t file, dataset; /* handles */
hid_t datatype, dataspace;
hid_t memspace;
H5T_class_t class; /* data type class */
H5T_order_t order; /* data order */
size_t size; /* size of the data element
stored in file */
size_t dimsm[3]; /* memory space dimensions */
size_t dims_out[2]; /* dataset dimensions */
herr_t status;
int data_out[NX][NY][NZ ]; /* output buffer */
size_t count[2]; /* size of the hyperslab in the file */
int offset[2]; /* hyperslab offset in the file */
size_t count_out[3]; /* size of the hyperslab in memory */
int offset_out[3]; /* hyperslab offset in memory */
int i, j, k, status_n, rank;
for (j = 0; j < NX; j++) {
for (i = 0; i < NY; i++) {
for (k = 0; k < NZ ; k++)
data_out[j][i][k] = 0;
}
}
/*
* Open the file and the dataset.
*/
file = H5Fopen(FILE, H5ACC_DEFAULT, H5C_DEFAULT);
dataset = H5Dopen(file, DATASETNAME);
/*
* Get datatype and dataspace handles and then query
* dataset class, order, size, rank and dimensions.
*/
datatype = H5Dget_type(dataset); /* datatype handle */
class = H5Tget_class(datatype);
if (class == H5T_INTEGER) printf("Data set has INTEGER type \n");
order = H5Tget_order(datatype);
if (order == H5T_ORDER_LE) printf("Little endian order \n");
size = H5Tget_size(datatype);
printf(" Data size is %d \n", size);
dataspace = H5Dget_space(dataset); /* dataspace handle */
rank = H5Pget_ndims(dataspace);
status_n = H5Pget_dims(dataspace, dims_out);
printf("rank %d, dimensions %d x %d \n", rank, dims_out[0], dims_out[1]);
/*
* Define hyperslab in the datatset.
*/
offset[0] = 1;
offset[1] = 2;
count[0] = NX_SUB;
count[1] = NY_SUB;
status = H5Pset_hyperslab(dataspace, offset, count, NULL);
/*
* Define the memory dataspace.
*/
dimsm[0] = NX;
dimsm[1] = NY;
dimsm[2] = NZ ;
memspace = H5Pcreate_simple(RANK_OUT,dimsm,NULL);
/*
* Define memory hyperslab.
*/
offset_out[0] = 3;
offset_out[1] = 0;
offset_out[2] = 0;
count_out[0] = NX_SUB;
count_out[1] = NY_SUB;
count_out[2] = 1;
status = H5Pset_hyperslab(memspace, offset_out, count_out, NULL);
/*
* Read data from hyperslab in the file into the hyperslab in
* memory and display.
*/
status = H5Dread(dataset, H5T_NATIVE_INT, memspace, dataspace,
H5C_DEFAULT, data_out);
for (j = 0; j < NX; j++) {
for (i = 0; i < NY; i++) printf("%d ", data_out[j][i][0]);
printf("\n");
}
/* 0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 0 0 0 0 0 0
3 4 5 6 0 0 0
4 5 6 7 0 0 0
5 6 7 8 0 0 0
0 0 0 0 0 0 0 */
/*
* Close/release resources.
*/
H5Tclose(datatype);
H5Dclose(dataset);
H5Pclose(dataspace);
H5Pclose(memspace);
H5Fclose(file);
}
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