ATOM MyRegisterClass(HINSTANCE hInstance)
{
	WNDCLASSEX wcex;

	wcex.cbSize = sizeof(WNDCLASSEX);
	wcex.style			= CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc	      = WndProc;
	wcex.cbClsExtra		= 0;
	wcex.cbWndExtra		= 0;
	wcex.hInstance		= hInstance;
	wcex.hIcon			= LoadIcon(hInstance, MAKEINTRESOURCE(IDI_EXAM));
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	= (HBRUSH)(COLOR_WINDOW+1);
	wcex.lpszMenuName		= MAKEINTRESOURCE(IDC_EXAM);
	wcex.lpszClassName	= szWindowClass;
	wcex.hIconSm		= LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
	return RegisterClassEx(&wcex);
}
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;
   hInst = hInstance; // Store instance handle in our global variable
   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
   if (!hWnd) {return FALSE;}
   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);
   return TRUE;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	(1)while (GetMessage(&msg, NULL, 0, 0))
	{
			TranslateMessage(hWnd, &message, &wParam, &lParam);
			DispatchMessage(hWnd, &message, &wParam, &lParam);
	}
	return message.wParam;
}
int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR    lpCmdLine,int nCmdShow)
{
	(2)MSG msg;
	HWND hWnd;
	MyRegisterClass(hInstance);
	if(InitInstance (hInstance, nCmdShow)) return FALSE;
	while (DefWindowProc(&hWnd, &msg, 0, 0))
{
		PAINTSTRUCT ps;
		HDC hdc;
		switch (msg)
		{
		case WM_PAINT:
			hdc = BeginPaint(hWnd, &ps);
			EndPaint(hWnd, &ps);
			break;
		case WM_DESTROY:
			PostQuitMessage(0);
			break;
		default:
			return DefWindowProc(&hWnd, msg, 0, 0);
		}
}