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h5ex_t_regref.c
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h5ex_t_regref.c
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/************************************************************
This example shows how to read and write region references
to a dataset. The program first creates a dataset
containing characters and writes references to region of
the dataset to a new dataset with a dataspace of DIM0,
then closes the file. Next, it reopens the file,
dereferences the references, and outputs the referenced
regions to the screen.
************************************************************/
#include "hdf5.h"
#include <stdio.h>
#include <stdlib.h>
#define FILE "h5ex_t_regref.h5"
#define DATASET "DS1"
#define DATASET2 "DS2"
#define DIM0 2
#define DS2DIM0 3
#define DS2DIM1 16
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 dset2 = H5I_INVALID_HID; /* Dataset Handle */
hid_t memspace = H5I_INVALID_HID; /* Mem dataspace */
herr_t status;
hsize_t dims[1] = {DIM0};
hsize_t dims2[2] = {DS2DIM0, DS2DIM1};
hsize_t coords[4][2] = {{0, 1}, {2, 11}, {1, 0}, {2, 4}};
hsize_t start[2] = {0, 0};
hsize_t stride[2] = {2, 11};
hsize_t count[2] = {2, 2};
hsize_t block[2] = {1, 3};
hssize_t npoints;
ssize_t size;
char *name = NULL;
int ndims;
hsize_t i;
char wdata2[DS2DIM0][DS2DIM1] = {"The quick brown", "fox jumps over ", "the 5 lazy dogs"};
char *rdata2 = NULL;
#if H5_VERSION_GE(1, 12, 0) && !defined(H5_USE_110_API) && !defined(H5_USE_18_API) && !defined(H5_USE_16_API)
hid_t ref_type = H5T_STD_REF; /* Reference datatype */
H5R_ref_t wdata[DIM0]; /* buffer to write to disk */
H5R_ref_t *rdata = NULL; /* buffer to read into*/
H5R_type_t objtype; /* Reference type */
#else
hid_t ref_type = H5T_STD_REF_DSETREG; /* Reference datatype */
hdset_reg_ref_t wdata[DIM0]; /* Write buffer */
hdset_reg_ref_t *rdata = NULL; /* Read buffer */
H5O_type_t objtype;
#endif
/*
* Create a new file using the default properties.
*/
file = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
if (file < 0)
goto done;
/*
* Create a dataset with character data.
*/
space = H5Screate_simple(2, dims2, NULL);
dset2 = H5Dcreate(file, DATASET2, H5T_STD_I8LE, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
if (dset2 < 0)
goto done;
status = H5Dwrite(dset2, H5T_NATIVE_CHAR, H5S_ALL, H5S_ALL, H5P_DEFAULT, wdata2);
/*
* Create reference to a list of elements in dset2.
*/
status = H5Sselect_elements(space, H5S_SELECT_SET, 4, coords[0]);
#if H5_VERSION_GE(1, 12, 0) && !defined(H5_USE_110_API) && !defined(H5_USE_18_API) && !defined(H5_USE_16_API)
status = H5Rcreate_region(file, DATASET2, space, H5P_DEFAULT, &wdata[0]);
#else
status = H5Rcreate(&wdata[0], file, DATASET2, H5R_DATASET_REGION, space);
#endif
if (status < 0)
goto done;
/*
* Create reference to a hyperslab in dset2, close dataspace.
*/
status = H5Sselect_hyperslab(space, H5S_SELECT_SET, start, stride, count, block);
#if H5_VERSION_GE(1, 12, 0) && !defined(H5_USE_110_API) && !defined(H5_USE_18_API) && !defined(H5_USE_16_API)
status = H5Rcreate_region(file, DATASET2, space, H5P_DEFAULT, &wdata[1]);
#else
status = H5Rcreate(&wdata[1], file, DATASET2, H5R_DATASET_REGION, space);
#endif
if (status < 0)
goto done;
status = H5Sclose(space);
/*
* 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 region references to it.
*/
dset = H5Dcreate(file, DATASET, ref_type, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
if (dset < 0)
goto done;
status = H5Dwrite(dset, ref_type, H5S_ALL, H5S_ALL, H5P_DEFAULT, wdata);
/*
* Close and release resources.
*/
#if H5_VERSION_GE(1, 12, 0) && !defined(H5_USE_110_API) && !defined(H5_USE_18_API) && !defined(H5_USE_16_API)
status = H5Rdestroy(&wdata[0]);
status = H5Rdestroy(&wdata[1]);
#endif
status = H5Dclose(dset);
status = H5Dclose(dset2);
status = H5Sclose(space);
status = H5Fclose(file);
/*
* Now we begin the read section of this example. Here we assume
* the dataset has 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);
if (file < 0)
goto done;
dset = H5Dopen(file, DATASET, H5P_DEFAULT);
if (dset < 0)
goto done;
/*
* Get dataspace and allocate memory for read buffer.
*/
space = H5Dget_space(dset);
ndims = H5Sget_simple_extent_dims(space, dims, NULL);
#if H5_VERSION_GE(1, 12, 0) && !defined(H5_USE_110_API) && !defined(H5_USE_18_API) && !defined(H5_USE_16_API)
rdata = (H5R_ref_t *)malloc(dims[0] * sizeof(H5R_ref_t));
#else
rdata = (hdset_reg_ref_t *)malloc(dims[0] * sizeof(hdset_reg_ref_t));
#endif
status = H5Sclose(space);
/*
* Read the data.
*/
status = H5Dread(dset, ref_type, H5S_ALL, H5S_ALL, H5P_DEFAULT, rdata);
/*
* Output the data to the screen.
*/
for (i = 0; i < dims[0]; i++) {
printf("%s[%" PRIuHSIZE "]:\n ->", DATASET, i);
/*
* Open the referenced object, retrieve its region as a
* dataspace selection.
*/
#if H5_VERSION_GE(1, 10, 0) && !defined(H5_USE_18_API) && !defined(H5_USE_16_API)
#if H5_VERSION_GE(1, 12, 0) && !defined(H5_USE_110_API) && !defined(H5_USE_18_API) && !defined(H5_USE_16_API)
dset2 = H5Ropen_object(&rdata[i], H5P_DEFAULT, H5P_DEFAULT);
space = H5Ropen_region(&rdata[i], H5P_DEFAULT, H5P_DEFAULT);
#else
dset2 = H5Rdereference(dset, H5P_DEFAULT, H5R_DATASET_REGION, &rdata[i]);
space = H5Rget_region(dset, H5R_DATASET_REGION, &rdata[i]);
#endif
#else
dset2 = H5Rdereference(dset, H5R_DATASET_REGION, &rdata[i]);
space = H5Rget_region(dset, H5R_DATASET_REGION, &rdata[i]);
#endif
if (dset2 < 0)
goto done;
/*
* Get the length of the object's name, allocate space, then
* retrieve the name.
*/
size = 1 + H5Iget_name(dset2, NULL, 0);
name = (char *)malloc(size);
size = H5Iget_name(dset2, name, size);
/*
* Allocate space for the read buffer. We will only allocate
* enough space for the selection, plus a null terminator. The
* read buffer will be 1-dimensional.
*/
npoints = H5Sget_select_npoints(space);
rdata2 = (char *)malloc(npoints + 1);
/*
* Read the dataset region, and add a null terminator so we can
* print it as a string.
*/
memspace = H5Screate_simple(1, (hsize_t *)&npoints, NULL);
status = H5Dread(dset2, H5T_NATIVE_CHAR, memspace, space, H5P_DEFAULT, rdata2);
rdata2[npoints] = '\0';
/*
* Print the name and region data, close and release resources.
*/
printf(" %s: %s\n", name, rdata2);
free(rdata2);
free(name);
#if H5_VERSION_GE(1, 12, 0) && !defined(H5_USE_110_API) && !defined(H5_USE_18_API) && !defined(H5_USE_16_API)
status = H5Rdestroy(&rdata[i]);
#endif
status = H5Sclose(space);
status = H5Sclose(memspace);
status = H5Dclose(dset2);
}
/*
* Close and release resources.
*/
free(rdata);
status = H5Dclose(dset);
status = H5Fclose(file);
return 0;
done:
return 1;
}