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* Merge examples repo into library * Change grepTest to be more fault-tolerant * Update examples macro file * Exclude all Fortran examples from doxygen
129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
/************************************************************
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This example shows how to read and write data to an
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external dataset. The program first writes integers to an
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external dataset with dataspace dimensions of DIM0xDIM1,
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then closes the file. Next, it reopens the file, reads
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back the data, and outputs the name of the external data
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file and the data to the screen.
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************************************************************/
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#include "hdf5.h"
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#include <stdio.h>
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#include <stdlib.h>
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#define FILE "h5ex_d_extern.h5"
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#define EXTERNAL "h5ex_d_extern.data"
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#define DATASET "DS1"
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#define DIM0 4
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#define DIM1 7
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#define NAME_BUF_SIZE 32
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int
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main(void)
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{
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hid_t file = H5I_INVALID_HID;
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hid_t space = H5I_INVALID_HID;
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hid_t dset = H5I_INVALID_HID;
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hid_t dcpl = H5I_INVALID_HID;
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herr_t status;
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hsize_t dims[2] = {DIM0, DIM1};
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char name[NAME_BUF_SIZE];
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int wdata[DIM0][DIM1]; /* Write buffer */
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int rdata[DIM0][DIM1]; /* Read buffer */
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hsize_t i, j;
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/*
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* Initialize data.
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*/
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for (i = 0; i < DIM0; i++)
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for (j = 0; j < DIM1; j++)
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wdata[i][j] = i * j - j;
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/*
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* Create a new file using the default properties.
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*/
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file = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
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/*
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* Create dataspace. Setting maximum size to NULL sets the maximum
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* size to be the current size.
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*/
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space = H5Screate_simple(2, dims, NULL);
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/*
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* Create the dataset creation property list, set the external
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* file.
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*/
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dcpl = H5Pcreate(H5P_DATASET_CREATE);
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status = H5Pset_external(dcpl, EXTERNAL, 0, H5F_UNLIMITED);
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/*
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* Create the external dataset.
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*/
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dset = H5Dcreate(file, DATASET, H5T_STD_I32LE, space, H5P_DEFAULT, dcpl, H5P_DEFAULT);
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/*
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* Write the data to the dataset.
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*/
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status = H5Dwrite(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, wdata[0]);
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/*
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* Close and release resources.
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*/
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status = H5Pclose(dcpl);
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status = H5Dclose(dset);
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status = H5Sclose(space);
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status = H5Fclose(file);
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/*
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* Now we begin the read section of this example.
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*/
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/*
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* Open file and dataset using the default properties.
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*/
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file = H5Fopen(FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
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dset = H5Dopen(file, DATASET, H5P_DEFAULT);
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/*
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* Retrieve dataset creation property list.
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*/
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dcpl = H5Dget_create_plist(dset);
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/*
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* Retrieve and print the name of the external file. Here we
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* manually set the last field in name to null, in case the name of
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* the file is longer than the buffer.
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*/
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status = H5Pget_external(dcpl, 0, NAME_BUF_SIZE, name, NULL, NULL);
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name[NAME_BUF_SIZE - 1] = '\0';
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printf("%s is stored in file: %s\n", DATASET, name);
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/*
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* Read the data using the default properties.
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*/
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status = H5Dread(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, rdata[0]);
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/*
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* Output the data to the screen.
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*/
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printf("%s:\n", DATASET);
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for (i = 0; i < DIM0; i++) {
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printf(" [");
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for (j = 0; j < DIM1; j++)
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printf(" %3d", rdata[i][j]);
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printf("]\n");
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}
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/*
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* Close and release resources.
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*/
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status = H5Pclose(dcpl);
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status = H5Dclose(dset);
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status = H5Fclose(file);
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return 0;
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}
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