HWND绑定用户数据

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hWnd = CreateWindow(...);
SetWindowLongPtr(hWnd, GWLP_USERDATA, (LONG_PTR)12345);
 
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	LONG_PTR pData = GetWindowLongPtr(hWnd, GWLP_USERDATA);
	...