查看网上说SetForegroundWindow调用有时候会失败，给出的解决办法是：
if(hWnd)
{
            HWND hForeWnd = ::GetForegroundWindow();
            DWORD dwForeID = ::GetWindowThreadProcessId(hForeWnd,NULL);
            DWORD dwCurID = ::GetCurrentThreadId();
            ::AttachThreadInput(dwCurID,dwForeID,TRUE);
            ::ShowWindow(hWnd,SW_SHOWNORMAL);
            ::SetWindowPos(hWnd,HWND_TOPMOST,0,0,0,0,SWP_NOSIZE|SWP_NOMOVE);
            ::SetWindowPos(hWnd,HWND_NOTOPMOST,0,0,0,0, SWP_NOSIZE|SWP_NOMOVE);
            ::SetForegroundWindow(hWnd);
            ::AttachThreadInput(dwCurID,dwForeID,FALSE);
//hWnd就是需要置前的窗口句柄
}

应该达到目的了，不知道把窗口调到前台这样操作会不会有安全隐患