code: def S(self):
      return c_longlong.in_dll(self._dll, "last_tf_arg_s").value
  
imports: import unittest
  from ctypes import *
  from ctypes.test import need_symbol
  import _ctypes_test
label_desc: Use image node_id 1 for calling the CFunctions obj's underlying member method code with example usage: obj.S() and returns: c_longlong