VC++ 窗口全屏置顶显示

        SetParent(NULL);
int cxScreen,cyScreen;
        cxScreen=GetSystemMetrics(SM_CXSCREEN);
        cyScreen=GetSystemMetrics(SM_CYSCREEN);
        ::SetWindowPos(m_hWnd,HWND_TOPMOST,0,0,cxScreen,cyScreen,SWP_SHOWWINDOW|SWP_NOZORDER);