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/************************************************************
This example shows how to track links in a group by
creation order. The program creates a series of groups,
then reads back their names: first in alphabetical order,
then in creation order.
This file is intended for use with HDF5 Library version 1.8
************************************************************/
#include "hdf5.h"
#include <stdio.h>
#include <stdlib.h>
#define FILE "h5ex_g_corder.h5"
int
main(void)
{
hid_t file = H5I_INVALID_HID;
hid_t group = H5I_INVALID_HID;
hid_t subgroup = H5I_INVALID_HID;
hid_t gcpl = H5I_INVALID_HID;
herr_t status;
H5G_info_t ginfo;
ssize_t size; /* Size of name */
hsize_t i; /* Index */
char *name = NULL; /* Output buffer */
/*
* Create a new file using the default properties.
*/
file = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/*
* Create group creation property list and enable link creation
* order tracking. Attempting to track by creation order in a
* group that does not have this property set will result in an
* error.
*/
gcpl = H5Pcreate(H5P_GROUP_CREATE);
status = H5Pset_link_creation_order(gcpl, H5P_CRT_ORDER_TRACKED | H5P_CRT_ORDER_INDEXED);
/*
* Create primary group using the property list.
*/
group = H5Gcreate(file, "index_group", H5P_DEFAULT, gcpl, H5P_DEFAULT);
/*
* Create subgroups in the primary group. These will be tracked
* by creation order. Note that these groups do not have to have
* the creation order tracking property set.
*/
subgroup = H5Gcreate(group, "H", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
status = H5Gclose(subgroup);
subgroup = H5Gcreate(group, "D", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
status = H5Gclose(subgroup);
subgroup = H5Gcreate(group, "F", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
status = H5Gclose(subgroup);
subgroup = H5Gcreate(group, "5", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
status = H5Gclose(subgroup);
/*
* Get group info.
*/
status = H5Gget_info(group, &ginfo);
/*
* Traverse links in the primary group using alphabetical indices
* (H5_INDEX_NAME).
*/
printf("Traversing group using alphabetical indices:\n\n");
for (i = 0; i < ginfo.nlinks; i++) {
/*
* Get size of name, add 1 for null terminator.
*/
size = 1 + H5Lget_name_by_idx(group, ".", H5_INDEX_NAME, H5_ITER_INC, i, NULL, 0, H5P_DEFAULT);
/*
* Allocate storage for name.
*/
name = (char *)malloc(size);
/*
* Retrieve name, print it, and free the previously allocated
* space.
*/
size = H5Lget_name_by_idx(group, ".", H5_INDEX_NAME, H5_ITER_INC, i, name, (size_t)size, H5P_DEFAULT);
printf("Index %d: %s\n", (int)i, name);
free(name);
}
/*
* Traverse links in the primary group by creation order
* (H5_INDEX_CRT_ORDER).
*/
printf("\nTraversing group using creation order indices:\n\n");
for (i = 0; i < ginfo.nlinks; i++) {
/*
* Get size of name, add 1 for null terminator.
*/
size = 1 + H5Lget_name_by_idx(group, ".", H5_INDEX_CRT_ORDER, H5_ITER_INC, i, NULL, 0, H5P_DEFAULT);
/*
* Allocate storage for name.
*/
name = (char *)malloc(size);
/*
* Retrieve name, print it, and free the previously allocated
* space.
*/
size = H5Lget_name_by_idx(group, ".", H5_INDEX_CRT_ORDER, H5_ITER_INC, i, name, (size_t)size,
H5P_DEFAULT);
printf("Index %d: %s\n", (int)i, name);
free(name);
}
/*
* Close and release resources.
*/
status = H5Pclose(gcpl);
status = H5Gclose(group);
status = H5Fclose(file);
return 0;
}
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