num_devices.i4.v = dio_read_list_length_c(list_id.i4.v

	This routine returns the length of a data acquisition list.

	list_id		returned list ID from previous call to
	[raw_length]	returned total length of raw data in bytes
			(default is NULL)

	This function returns values as follows:

	0			list does not exist
	otherwise		number of devices in the list

	This function requires the following include files:


	Related functions:

	dio_list_info, dio_bld_get(_c), dio_bld_get_raw(_c),
	dio_get_lst, dio_get_lst_raw(_c), dio_extract_read_list_status_c,
	dio_get_read_list_devices_c, dio_read_list_single_entry_info_c,
	dio_set_list_length_c, dio_extract_set_list_status_c,
	dio_set_list_single_entry_info_c, dio_slist_info,

	C/C++ usage:

	int	num_devices;
	int	list_id;
	int	raw_length;

	num_devices = dio_read_list_length_c(list_id,&raw_length);