enthought#31: Improved 64-bit compatibility by specifying argtypes for GetMessage.

Author: jaraco

comtypes/messageloop.py

@@ -1,8 +1,15 @@
+import ctypes
 from ctypes import WinDLL, byref, WinError
 from ctypes.wintypes import MSG
 _user32 = WinDLL("user32")
 
 GetMessage = _user32.GetMessageA
+GetMessage.argtypes = [
+    ctypes.c_void_p,
+    ctypes.c_void_p,
+    ctypes.c_uint,
+    ctypes.c_uint,
+]
 TranslateMessage = _user32.TranslateMessage
 DispatchMessage = _user32.DispatchMessageA