extern void DrawWindowFrame(HWND hWnd)//画窗口边框
{RECT rc;HWND DeskHwnd = ::GetDesktopWindow(); //取得桌面句柄HDC DeskDC = ::GetWindowDC(DeskHwnd); //取得桌面设备场景int oldRop2 = SetROP2(DeskDC, R2_NOTXORPEN);::GetWindowRect(hWnd, &rc); //获得窗口矩形if( rc.left < 0 ) rc.left = 0;if (rc.top < 0 ) rc.top = 0;HPEN newPen = ::CreatePen(0, 3, RGB(125,0,125));    //建立新画笔,载入DeskDCHGDIOBJ oldPen = ::SelectObject(DeskDC, newPen);::Rectangle(DeskDC, rc.left, rc.top, rc.right, rc.bottom);  //在指示窗口周围显示闪烁矩形//::Beep(100,100);Sleep(400);    //设置闪烁时间间隔
    ::Rectangle( DeskDC, rc.left, rc.top, rc.right, rc.bottom);::SetROP2(DeskDC, oldRop2);::SelectObject( DeskDC, oldPen);::DeleteObject(newPen);::ReleaseDC( DeskHwnd, DeskDC);DeskDC = NULL;
}