如何调用系统下屏保的API?

Question

想做个屏保的功能...上网查了些资料...尝试着写出来然后运行
但是结果是完全没有效果..
不知道是哪里出了错
也用了 try...catch...但是没有任何提示...
希望有人做过的话来帮帮忙解决吧...
 // 屏保状态
        const uint SPI_SETSCREENSAVEACTIVE = 0x0011;
        // 获取屏幕壁纸地址
        const uint SPI_GETDESKWALLPAPER = 0x0073;        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        static extern bool SystemParametersInfo(uint uAction, uint uParam, StringBuilder lpvParam, uint init);        //设置屏保
        public static void SetScreener()
        {
            try
            {
                bool ok;
                StringBuilder str = new StringBuilder(100);
                ok = SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, 1, str, 0);
            }
            catch (Exception)
            {                throw;
            }
        }        //取消屏保
        public static void CancelScreener()
        {
            try
            {
                bool ok;
                StringBuilder str = new StringBuilder(100);
                ok = SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, 0, str, 0);
            }
            catch (Exception)
            {                throw;
            }
        }
PS: 不要太关注于头像...那只是一张图片而已...

Answer 1

http://blog.csdn.net/cstester/article/details/4835013
应该没到启动时间吧。 或者没激活程序。 参考下吧