H5P_GET_OBJECT_FLUSH_CB gets the user-defined callback function that is set in the file access property list fapl_id and stored in the parameter func. The callback is invoked whenever an object flush occurs in the file. This routine also obtains the user-defined input data that is passed along to the callback function in the parameter user_data.

The example below illustrates the usage of this routine to obtain the object flush property values.

hid_t fapl_id;
unsigned counter;
H5F_object_flush_t *ret_cb;
unsigned *ret_counter;

/* Create a copy of the file access property list */
fapl_id = H5Pcreate(H5P_FILE_ACCESS);

/* Set up the object flush property values */
/* flush_cb: callback function to invoke when an object flushes (see below) */
/* counter: user data to pass along to the callback function */
H5Pset_object_flush_cb(fapl_id, flush_cb, &counter);

/* Open the file */
file_id = H5Fopen(FILE, H5F_ACC_RDWR, H5P_DEFAULT);

/* Get the file access property list for the file */
fapl = H5Fget_access_plist(file_id);

/* Retrieve the object flush property values for the file */
H5Pget_object_flush_cb(fapl, &ret_cb, &ret_counter);
/* ret_cb will point to flush_cb() */
/* ret_counter will point to counter */
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/* The callback function for the object flush property */
static herr_t
flush_cb(hid_t obj_id, void *_udata)
{
    unsigned *flush_ct = (unsigned*)_udata;
    ++(*flush_ct);
    return 0;
}