dio_snapshot_class_info_c

	status.i4.v = dio_snapshot_class_info_c(snap_classes.i4a.r,
						num_classes.i4.v,
						class_info.sa.r,
						errors.i2a.r)

	This routine retrieves information about snapshot plot classes.

	snap_classes	snapshot class code(s) (constants are in 'ftp')
	num_classes	number of classes
	class_info	returned snapshot class information
			(array of structures of type DIO_SNAPSHOT_CLASS_DATA)
	errors		array of returned ACNET status values

	This function returns ACNET status values as follows:

	OK			success
	negative value		ACNET format error indicating overall failure
	positive value		number of devices in error indicating partial
				success

	This function requires the following include files:

	diolib_h, ftp_h, cns_data_structs_h, acnet_errors_h

	Related functions:

	dio_can_read_using_snapshot_c, dio_can_snapshot_c,
	dio_can_trigger_snapshot_c, dio_build_snapshot_list_c,
	dio_get_snapshot_list_c, dio_get_raw_snapshot_list_c,
	dio_cancel_snapshot_list_c, dio_rearm_snapshot_list_c,
	dio_can_read_using_ftp_c, dio_can_ftp_c, dio_ftp_class_info_c,
	sr_sda_get_snapshot_list_c, sr_sda_get_raw_snapshot_list_c,
	error_in_list(_c), dio_snapshot_default_freq_c

	C/C++ usage:

	short	errors[NUM_CLASSES];
	int	status;
	static const int	snap_classes[NUM_CLASSES] =
	{SNAP_CLASS_C190, SNAP_CLASS_C290};
	DIO_SNAPSHOT_CLASS_DATA	class_info[NUM_CLASSES];

	status = dio_snapshot_class_info_c(snap_classes,num_classes,
					   class_info);