Win32 设置窗口透明度 SetLayerTransparent

注意:

在调用SetLayeredWindowAttributes 之前,需要给窗口加上WS_EX_LAYERED属性,否则会无效

void SetLayerTransparent(HWND hWnd)

{

    static bool isTransParent = false;

    if (isTransParent == false)

    {

        DWORD exStyle = ::GetWindowLong(hWnd, GWL_EXSTYLE);

        exStyle |= WS_EX_LAYERED;

        ::SetWindowLong(hWnd, GWL_EXSTYLE, exStyle);

        ::SetLayeredWindowAttributes(hWnd, RGB(, , ), , LWA_ALPHA);

        isTransParent = true;

    }

    else

    {

        ::SetLayeredWindowAttributes(hWnd, RGB(, , ), , LWA_ALPHA);

        isTransParent = false;

    }

}