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https://github.com/HDFGroup/hdf5.git
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11dfa25910
* Updated source file copyright headers to remove "Copyright by the Board of Trustees of the University of Illinois", which is kept in the top-level COPYING file.
142 lines
4.6 KiB
C
142 lines
4.6 KiB
C
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by The HDF Group. *
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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 COPYING file, which can be found at the root of the source code *
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* distribution tree, or in https://www.hdfgroup.org/licenses. *
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* If you do not have access to either file, you may request a copy from *
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* help@hdfgroup.org. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/*
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* This example illustrates how to read/write a subset of data (a slab)
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* from/to a dataset in an HDF5 file. It is used in the HDF5 Tutorial.
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*/
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#include "hdf5.h"
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#define FILE "subset.h5"
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#define DATASETNAME "IntArray"
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#define RANK 2
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#define DIM0_SUB 3 /* subset dimensions */
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#define DIM1_SUB 4
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#define DIM0 8 /* size of dataset */
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#define DIM1 10
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int
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main(void)
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{
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hsize_t dims[2], dimsm[2];
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int data[DIM0][DIM1]; /* data to write */
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int sdata[DIM0_SUB][DIM1_SUB]; /* subset to write */
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int rdata[DIM0][DIM1]; /* buffer for read */
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hid_t file_id, dataset_id; /* handles */
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hid_t dataspace_id, memspace_id;
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herr_t status;
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hsize_t count[2]; /* size of subset in the file */
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hsize_t offset[2]; /* subset offset in the file */
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hsize_t stride[2];
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hsize_t block[2];
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int i, j;
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/*****************************************************************
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* Create a new file with default creation and access properties.*
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* Then create a dataset and write data to it and close the file *
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* and dataset. *
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*****************************************************************/
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file_id = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
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dims[0] = DIM0;
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dims[1] = DIM1;
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dataspace_id = H5Screate_simple(RANK, dims, NULL);
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dataset_id =
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H5Dcreate2(file_id, DATASETNAME, H5T_STD_I32BE, dataspace_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
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for (j = 0; j < DIM0; j++) {
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for (i = 0; i < DIM1; i++)
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if (i < (DIM1 / 2))
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data[j][i] = 1;
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else
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data[j][i] = 2;
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}
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status = H5Dwrite(dataset_id, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, data);
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printf("\nData Written to File:\n");
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for (i = 0; i < DIM0; i++) {
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for (j = 0; j < DIM1; j++)
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printf(" %i", data[i][j]);
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printf("\n");
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}
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status = H5Sclose(dataspace_id);
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status = H5Dclose(dataset_id);
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status = H5Fclose(file_id);
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/*****************************************************
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* Reopen the file and dataset and write a subset of *
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* values to the dataset.
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*****************************************************/
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file_id = H5Fopen(FILE, H5F_ACC_RDWR, H5P_DEFAULT);
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dataset_id = H5Dopen2(file_id, DATASETNAME, H5P_DEFAULT);
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/* Specify size and shape of subset to write. */
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offset[0] = 1;
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offset[1] = 2;
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count[0] = DIM0_SUB;
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count[1] = DIM1_SUB;
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stride[0] = 1;
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stride[1] = 1;
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block[0] = 1;
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block[1] = 1;
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/* Create memory space with size of subset. Get file dataspace
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and select subset from file dataspace. */
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dimsm[0] = DIM0_SUB;
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dimsm[1] = DIM1_SUB;
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memspace_id = H5Screate_simple(RANK, dimsm, NULL);
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dataspace_id = H5Dget_space(dataset_id);
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status = H5Sselect_hyperslab(dataspace_id, H5S_SELECT_SET, offset, stride, count, block);
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/* Write a subset of data to the dataset, then read the
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entire dataset back from the file. */
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printf("\nWrite subset to file specifying:\n");
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printf(" offset=1x2 stride=1x1 count=3x4 block=1x1\n");
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for (j = 0; j < DIM0_SUB; j++) {
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for (i = 0; i < DIM1_SUB; i++)
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sdata[j][i] = 5;
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}
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status = H5Dwrite(dataset_id, H5T_NATIVE_INT, memspace_id, dataspace_id, H5P_DEFAULT, sdata);
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status = H5Dread(dataset_id, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, rdata);
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printf("\nData in File after Subset is Written:\n");
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for (i = 0; i < DIM0; i++) {
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for (j = 0; j < DIM1; j++)
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printf(" %i", rdata[i][j]);
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printf("\n");
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}
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status = H5Sclose(memspace_id);
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status = H5Sclose(dataspace_id);
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status = H5Dclose(dataset_id);
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status = H5Fclose(file_id);
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}
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