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电子会议共享桌面时如何获取鼠标轨迹

现在在用c#做一个电子会议系统,共享会议主持者桌面时看不到鼠标,请问这个鼠标怎么捕捉?
以下是取屏的代码:
        private byte[] GetScreen()
        {
            Bitmap screenshot;
            Graphics graph;
            screenshot = new Bitmap(n_Width, n_Height,                   System.Drawing.Imaging.PixelFormat.Format16bppRgb555);
            graph = Graphics.FromImage(screenshot);
            graph.CopyFromScreen(0, 0, 0, 0, new Size(n_Width, n_Height), CopyPixelOperation.SourceCopy);

            MemoryStream ms = new MemoryStream();

            screenshot.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg); //按新分辨率存储

            screenshot.Dispose();
            graph.Dispose();
            return Compress.CompressBytes(ms.GetBuffer());
        } 鼠标 C# 桌面共享
补充:.NET技术 ,  C#
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