How can I pass HWND parameter in funciton ?

I want to install "BOOL PostMessage(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)  " to lua ?First, I defined a converter of HWND type:
template <>
	struct default_converter<HWND>
		: native_converter_base<HWND>
	{
		int compute_score(lua_State* L, int index)
		{
			return cv.compute_score(L, index);
		}


		HWND from(lua_State* L, int index)
		{
			return HWND(lua_tointeger(L, index));
		}


		void to(lua_State* L, HWND const& x)
		{
			lua_pushinteger(L, (int)x);
		}


		default_converter<int> cv;
	};



Then, I defined the function like below:
def("PostMessage", &PostMessage)


But, the complier show :
 'int luabind::native_converter_base<T>::match(lua_State *,luabind::detail::by_value<T>,int)' : cannot convert parameter 2 from 'luabind::detail::by_pointer<T>' to 'luabind::detail::by_value<T>'


Then, I defined the function like this:
def("PostMessage", &PostMessage, copy(_1))


But it didn't work too!


How can I install the PostMessage function to lua ?


Thanks!

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