[Win32]定时器SetTimer

 要调用的地方

	SetTimer(g_hMainWnd,ID_GIVEUP,1000,NULL);//会给主窗口发送WM_TIMER消息；1000=1秒；ID_GIVEUP为标识

	if (MessageBox(g_hMainWnd,L"确定要退出吗？",L"提示",MB_YESNO)==IDYES)
	{ 
		KillTimer(g_hMainWnd,ID_GIVEUP);
		//自己的代码
	}	

主窗口消息处理函数： 

LRESULT CALLBACK GameMainWnd::GameMainWndProc(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam)
{
	HDC hdc;
	UINT nCtrlId;
	PAINTSTRUCT ps;
	LPCREATESTRUCT lpcs;
	GameMainWnd* lpWnd = (GameMainWnd*)GetWindowLongPtr(hWnd, GWLP_USERDATA);
	switch (nMsg) {
	case WM_CREATE:
		lpcs = (LPCREATESTRUCT)lParam;
		SetWindowLongPtr(hWnd, GWLP_USERDATA, (LONG_PTR)lpcs->lpCreateParams);
		break;
	case WM_DESTROY:
		SetWindowLongPtr(hWnd, GWLP_USERDATA, NULL);
		break;
	case WM_PAINT:
		hdc =BeginPaint(hWnd, &ps);
		lpWnd->OnPaint(hdc);
		EndPaint(hWnd, &ps);
		break;
	case WM_SIZE:
		lpWnd->