code: def test_callconv_2(self):
      # Calling stdcall function as cdecl
  
      IsWindow = cdll.user32.IsWindow
  
      # ValueError: Procedure called with not enough arguments
      # (4 bytes missing) or wrong calling convention
      self.assertRaises(ValueError, IsWindow, None)
  
imports: from ctypes import *
  from ctypes.test import requires
  import unittest, sys
  from test import test_support
  import _ctypes_test
label_desc: Use image node_id 2 for calling the WindowsTestCase obj's underlying member method code with example usage: obj.test_callconv_2() without return types