win32 c++ 窗体在任务栏中隐藏

DWORD dwExStyle = GetWindowLong(hWnd, GWL_STYLE);

   dwExStyle &= ~(WS_VISIBLE);

   dwExStyle |= WS_EX_TOOLWINDOW;   

   dwExStyle &= ~(WS_EX_APPWINDOW);

   SetWindowLong(hWnd, GWL_STYLE, dwExStyle);

   ShowWindow(hWnd, SW_SHOW);

   ShowWindow(hWnd, SW_HIDE);

   UpdateWindow(hWnd);