任务栏和开始菜单透明

    HWND hWnd = ::FindWindow(_TEXT("Shell_TrayWnd"), NULL);
    if(hWnd!=NULL)
    {
        ::SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);
        ::SetLayeredWindowAttributes(hWnd, 0, 255 * alpha / 100, LWA_ALPHA);
    }

    hWnd = ::FindWindow(_TEXT("DV2ControlHost"), NULL);
    if(hWnd!=NULL)
    {
        ::SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);
        ::SetLayeredWindowAttributes(hWnd, 0, 255 * alpha / 100, LWA_ALPHA);
    }

    hWnd = ::FindWindow(_TEXT("BaseBar"), NULL);
    if(hWnd!=NULL)
    {
        ::SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);
        ::SetLayeredWindowAttributes(hWnd, 0, 255 * alpha / 100, LWA_ALPHA);
    }