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/************************************************************
This example shows how to read and write array datatypes
to a dataset. The program first writes integers arrays of
dimension ADIM0xADIM1 to a dataset with a dataspace of
DIM0, then closes the file. Next, it reopens the file,
reads back the data, and outputs it to the screen.
************************************************************/
#include "hdf5.h"
#include <stdio.h>
#include <stdlib.h>
#define FILE "h5ex_t_array.h5"
#define DATASET "DS1"
#define DIM0 4
#define ADIM0 3
#define ADIM1 5
int
main(void)
{
hid_t file = H5I_INVALID_HID; /* File Handle */
hid_t space = H5I_INVALID_HID; /* Dataspace Handle */
hid_t dset = H5I_INVALID_HID; /* Dataset Handle */
hid_t filetype = H5I_INVALID_HID;
hid_t memtype = H5I_INVALID_HID;
/* Handles */
herr_t status;
hsize_t dims[1] = {DIM0};
hsize_t adims[2] = {ADIM0, ADIM1};
int wdata[DIM0][ADIM0][ADIM1]; /* Write buffer */
int ***rdata = NULL; /* Read buffer */
int ndims;
hsize_t i, j, k;
/*
* Initialize data. i is the element in the dataspace, j and k the
* elements within the array datatype.
*/
for (i = 0; i < DIM0; i++)
for (j = 0; j < ADIM0; j++)
for (k = 0; k < ADIM1; k++)
wdata[i][j][k] = i * j - j * k + i * k;
/*
* Create a new file using the default properties.
*/
file = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/*
* Create array datatypes for file and memory.
*/
filetype = H5Tarray_create(H5T_STD_I64LE, 2, adims);
memtype = H5Tarray_create(H5T_NATIVE_INT, 2, adims);
/*
* Create dataspace. Setting maximum size to NULL sets the maximum
* size to be the current size.
*/
space = H5Screate_simple(1, dims, NULL);
/*
* Create the dataset and write the array data to it.
*/
dset = H5Dcreate(file, DATASET, filetype, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
status = H5Dwrite(dset, memtype, H5S_ALL, H5S_ALL, H5P_DEFAULT, wdata[0][0]);
/*
* Close and release resources.
*/
status = H5Dclose(dset);
status = H5Sclose(space);
status = H5Tclose(filetype);
status = H5Tclose(memtype);
status = H5Fclose(file);
/*
* Now we begin the read section of this example. Here we assume
* the dataset and array have the same name and rank, but can have
* any size. Therefore we must allocate a new array to read in
* data using malloc().
*/
/*
* Open file and dataset.
*/
file = H5Fopen(FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
dset = H5Dopen(file, DATASET, H5P_DEFAULT);
/*
* Get the datatype and its dimensions.
*/
filetype = H5Dget_type(dset);
ndims = H5Tget_array_dims(filetype, adims);
/*
* Get dataspace and allocate memory for read buffer. This is a
* three dimensional dataset when the array datatype is included so
* the dynamic allocation must be done in steps.
*/
space = H5Dget_space(dset);
ndims = H5Sget_simple_extent_dims(space, dims, NULL);
/*
* Allocate array of pointers to two-dimensional arrays (the
* elements of the dataset.
*/
rdata = (int ***)malloc(dims[0] * sizeof(int **));
/*
* Allocate two dimensional array of pointers to rows in the data
* elements.
*/
rdata[0] = (int **)malloc(dims[0] * adims[0] * sizeof(int *));
/*
* Allocate space for integer data.
*/
rdata[0][0] = (int *)malloc(dims[0] * adims[0] * adims[1] * sizeof(int));
/*
* Set the members of the pointer arrays allocated above to point
* to the correct locations in their respective arrays.
*/
for (i = 0; i < dims[0]; i++) {
rdata[i] = rdata[0] + i * adims[0];
for (j = 0; j < adims[0]; j++)
rdata[i][j] = rdata[0][0] + (adims[0] * adims[1] * i) + (adims[1] * j);
}
/*
* Create the memory datatype.
*/
memtype = H5Tarray_create(H5T_NATIVE_INT, 2, adims);
/*
* Read the data.
*/
status = H5Dread(dset, memtype, H5S_ALL, H5S_ALL, H5P_DEFAULT, rdata[0][0]);
/*
* Output the data to the screen.
*/
for (i = 0; i < dims[0]; i++) {
printf("%s[%llu]:\n", DATASET, i);
for (j = 0; j < adims[0]; j++) {
printf(" [");
for (k = 0; k < adims[1]; k++)
printf(" %3d", rdata[i][j][k]);
printf("]\n");
}
printf("\n");
}
/*
* Close and release resources.
*/
free(rdata[0][0]);
free(rdata[0]);
free(rdata);
status = H5Dclose(dset);
status = H5Sclose(space);
status = H5Tclose(filetype);
status = H5Tclose(memtype);
status = H5Fclose(file);
return 0;
}
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