Windows 窗口至顶

　　::SetWindowPos(m_hWnd, HWND_TOPMOST,0,0,0,0, SWP_NOSIZE | SWP_NOMOVE);

2.取消窗口顶层

　　::SetWindowPos(m_hWnd, HWND_NOTOPMOST,0,0,0,0, SWP_NOSIZE | SWP_NOMOVE);