How can I install Window types in lua ?

Question 1 :


I installed a class member function like below :


member function :
        HWND CRenderManager::GetSafeWnd()
	{
		DCHECK(::IsWindow(m_hWnd));
		return m_hWnd;
	}



install to lua :
       void CRenderManager::InstallToLua( lua_State* luaState )
	{
		DCHECK(luaState);
		using namespace luabind;
		module(luaState, "ui")
			[
				class_<CRenderManager>("RenderManager")
				.def("GetSafeWnd", &CRenderManager::GetSafeWnd)
			];
	}



Now, I use the member function in lua :
 function SysButton:OnClose(object)
	local render = object:GetRenderManager() -- Get RenderManager installed
	render:GetSafeWnd() -- Here is the problem ?
end


When the code step out the member function, it throw an exception like this :
[c]-1(method GetSafeWnd) std::runtime_error: 'Trying to use unregistered class'


Is it because the HWND type should be installed to lua ?  I look up MSDN :
typedef HANDLE HWND;typedef PVOID HANDLE;typedef void *PVOID;How can I install Windows types (HWND, HANDLE...) to Lua ?Question 2 :How can I register Windows API (PostMessage、SendMessage、Point) to lua ?

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