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h5ex_t_objref.c
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h5ex_t_objref.c
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/************************************************************
This example shows how to read and write object references
to a dataset. The program first creates objects in the
file and writes references to those objects to a dataset
with a dataspace of DIM0, then closes the file. Next, it
reopens the file, dereferences the references, and outputs
the names of their targets to the screen.
************************************************************/
#include "hdf5.h"
#include <stdio.h>
#include <stdlib.h>
#define FILE "h5ex_t_objref.h5"
#define DATASET "DS1"
#define DIM0 2
#define RANK 1
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 obj = H5I_INVALID_HID; /* Object Handle */
herr_t status;
hsize_t dims[1] = {DIM0};
ssize_t size;
char *name = NULL;
int ndims;
hsize_t i;
#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*/
H5O_type_t objtype; /* Reference type */
#else
hid_t ref_type = H5T_STD_REF_OBJ; /* Reference datatype */
hobj_ref_t wdata[DIM0]; /* Write buffer */
hobj_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);
/*
* Create a dataset with a null dataspace.
*/
space = H5Screate(H5S_NULL);
obj = H5Dcreate(file, "DS2", H5T_STD_I32LE, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
status = H5Dclose(obj);
status = H5Sclose(space);
/*
* Create a group.
*/
obj = H5Gcreate(file, "G1", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
status = H5Gclose(obj);
/*
* Create dataspace. Setting maximum size to NULL sets the maximum
* size to be the current size.
*/
space = H5Screate_simple(RANK, dims, NULL);
/*
* Create references to the previously created objects.
*/
#if H5_VERSION_GE(1, 12, 0) && !defined(H5_USE_110_API) && !defined(H5_USE_18_API) && !defined(H5_USE_16_API)
status = H5Rcreate_object(file, "G1", H5R_OBJECT, &wdata[0]);
status = H5Rcreate_object(file, "DS2", H5R_OBJECT, &wdata[1]);
#else
/*
* Passing -1
* as space_id causes this parameter to be ignored. Other values
* besides valid dataspaces result in an error.
*/
status = H5Rcreate(&wdata[0], file, "G1", H5R_OBJECT, -1);
status = H5Rcreate(&wdata[1], file, "DS2", H5R_OBJECT, -1);
#endif
/*
* Create the dataset and write the object references to it.
*/
dset = H5Dcreate(file, DATASET, ref_type, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
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 = 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);
dset = H5Dopen(file, DATASET, H5P_DEFAULT);
/*
* 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 = (hobj_ref_t *)malloc(dims[0] * sizeof(hobj_ref_t));
#endif
/*
* 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, get its name and type.
*/
#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)
obj = H5Ropen_object(&rdata[i], H5P_DEFAULT, H5P_DEFAULT);
status = H5Rget_obj_type3(&rdata[i], H5P_DEFAULT, &objtype);
#else
obj = H5Rdereference(dset, H5P_DEFAULT, H5R_OBJECT, &rdata[i]);
status = H5Rget_obj_type(dset, H5R_OBJECT, &rdata[i], &objtype);
#endif
#else
obj = H5Rdereference(dset, H5R_OBJECT, &rdata[i]);
status = H5Rget_obj_type(dset, H5R_OBJECT, &rdata[i], &objtype);
#endif
/*
* Get the length of the name, allocate space, then retrieve
* the name.
*/
size = 1 + H5Iget_name(obj, NULL, 0);
name = (char *)malloc(size);
size = H5Iget_name(obj, name, size);
/*
* Print the object type and close the object.
*/
switch (objtype) {
case H5O_TYPE_GROUP:
printf("Group");
break;
case H5O_TYPE_DATASET:
printf("Dataset");
break;
case H5O_TYPE_NAMED_DATATYPE:
printf("Named Datatype");
break;
case H5O_TYPE_MAP:
printf("Map Object");
break;
case H5O_TYPE_UNKNOWN:
case H5O_TYPE_NTYPES:
printf("Unknown");
}
status = H5Oclose(obj);
/*
* Print the name and deallocate space for the name.
*/
printf(": %s\n", name);
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
}
/*
* Close and release resources.
*/
free(rdata);
status = H5Dclose(dset);
status = H5Sclose(space);
status = H5Fclose(file);
return 0;
}