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137 lines
3.9 KiB
C
137 lines
3.9 KiB
C
/*
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* This example reads hyperslab from the SDS.h5 file
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* created by h5_write.c program into two-dimensional
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* plane of the three-dimensional array.
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* Information about dataset in the SDS.h5 file is obtained.
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*/
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#include "hdf5.h"
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#define FILE "SDS.h5"
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#define DATASETNAME "IntArray"
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#define NX_SUB 3 /* hyperslab dimensions */
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#define NY_SUB 4
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#define NX 7 /* output buffer dimensions */
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#define NY 7
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#define NZ 3
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#define RANK 2
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#define RANK_OUT 3
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int
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main (void)
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{
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hid_t file, dataset; /* handles */
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hid_t datatype, dataspace;
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hid_t memspace;
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H5T_class_t class; /* data type class */
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H5T_order_t order; /* data order */
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size_t size; /*
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* size of the data element
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* stored in file
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*/
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hsize_t dimsm[3]; /* memory space dimensions */
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hsize_t dims_out[2]; /* dataset dimensions */
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herr_t status;
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int data_out[NX][NY][NZ ]; /* output buffer */
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hsize_t count[2]; /* size of the hyperslab in the file */
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hssize_t offset[2]; /* hyperslab offset in the file */
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hsize_t count_out[3]; /* size of the hyperslab in memory */
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hssize_t offset_out[3]; /* hyperslab offset in memory */
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int i, j, k, status_n, rank;
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for (j = 0; j < NX; j++) {
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for (i = 0; i < NY; i++) {
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for (k = 0; k < NZ ; k++)
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data_out[j][i][k] = 0;
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}
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}
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/*
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* Open the file and the dataset.
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*/
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file = H5Fopen(FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
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dataset = H5Dopen(file, DATASETNAME);
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/*
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* Get datatype and dataspace handles and then query
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* dataset class, order, size, rank and dimensions.
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*/
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datatype = H5Dget_type(dataset); /* datatype handle */
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class = H5Tget_class(datatype);
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if (class == H5T_INTEGER) printf("Data set has INTEGER type \n");
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order = H5Tget_order(datatype);
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if (order == H5T_ORDER_LE) printf("Little endian order \n");
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size = H5Tget_size(datatype);
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printf(" Data size is %d \n", size);
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dataspace = H5Dget_space(dataset); /* dataspace handle */
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rank = H5Sget_simple_extent_ndims(dataspace);
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status_n = H5Sget_simple_extent_dims(dataspace, dims_out, NULL);
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printf("rank %d, dimensions %lu x %lu \n", rank,
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(unsigned long)(dims_out[0]), (unsigned long)(dims_out[1]));
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/*
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* Define hyperslab in the dataset.
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*/
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offset[0] = 1;
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offset[1] = 2;
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count[0] = NX_SUB;
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count[1] = NY_SUB;
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status = H5Sselect_hyperslab(dataspace, H5S_SELECT_SET, offset, NULL,
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count, NULL);
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/*
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* Define the memory dataspace.
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*/
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dimsm[0] = NX;
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dimsm[1] = NY;
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dimsm[2] = NZ ;
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memspace = H5Screate_simple(RANK_OUT,dimsm,NULL);
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/*
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* Define memory hyperslab.
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*/
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offset_out[0] = 3;
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offset_out[1] = 0;
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offset_out[2] = 0;
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count_out[0] = NX_SUB;
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count_out[1] = NY_SUB;
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count_out[2] = 1;
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status = H5Sselect_hyperslab(memspace, H5S_SELECT_SET, offset_out, NULL,
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count_out, NULL);
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/*
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* Read data from hyperslab in the file into the hyperslab in
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* memory and display.
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*/
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status = H5Dread(dataset, H5T_NATIVE_INT, memspace, dataspace,
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H5P_DEFAULT, data_out);
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for (j = 0; j < NX; j++) {
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for (i = 0; i < NY; i++) printf("%d ", data_out[j][i][0]);
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printf("\n");
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}
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/*
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* 0 0 0 0 0 0 0
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* 0 0 0 0 0 0 0
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* 0 0 0 0 0 0 0
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* 3 4 5 6 0 0 0
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* 4 5 6 7 0 0 0
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* 5 6 7 8 0 0 0
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* 0 0 0 0 0 0 0
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*/
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/*
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* Close/release resources.
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*/
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H5Tclose(datatype);
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H5Dclose(dataset);
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H5Sclose(dataspace);
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H5Sclose(memspace);
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H5Fclose(file);
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return 0;
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}
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