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LRESULT CALLBACK Fen::WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam){	switch(msg)	{	case WM_DESTROY:		is_run = false;		return (0);	default:		break;	}	LRESULT res = DefWindowProc(hwnd, msg, wParam, lParam);	return (res);}