它的工作我是这样的：

• 当客户想要接收的截图，你需要传递开始前就知道图像尺寸。
  结果呼叫 GetScreenShotSize（）来获得图像的大小。




• 一旦你获得了尺寸，叫 GetScreenShot（）来接收图像数据。

我用使用（MemoryStream的毫秒=新的MemoryStream（））所以现在PNG格式工作。

 私人图片IMG = NULL; 
众长GetScreenShotSize（）
 {
矩形范围= Screen.GetBounds（Point.Empty）;使用（BMP位图=新位图（bounds.Width，bounds.Height））
 {
使用
（图形G = Graphics.FromImage（BMP））
 {
 g.CopyFromScreen（Point.Empty，Point.Empty，bounds.Size）; 
}使用
（MemoryStream的毫秒=新的MemoryStream（））
 {
 bmp.Save（MS，System.Drawing.Imaging.ImageFormat.Png）; 
 IMG = Image.FromStream（毫秒）; 
返回ms.Length; 
} 
} 
} 
公共无效GetScreenShot（IPEndPoint EP）
 {$ B $使用B（Socket套接字=新的Socket（AddressFamily.InterNetwork，SocketType.Stream ，ProtocolType.Tcp））
 {
 socket.Connect（EP）; 
使用（MemoryStream的毫秒=新的MemoryStream（））
 {
 img.Save（MS，System.Drawing.Imaging.ImageFormat.Png）; 
 socket.Send（ms.ToArray（），SocketFlags.None）; 
} 
 img.Dispose（）; 
 IMG = NULL; 
} 
} 
 

I have a server-client application, i want to get a Screen Shot from server,but on the line
bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
i get this exception : A generic error occurred in GDI+.

    private Socket ScreenSocket;
    private MemoryStream ms;
    public void ConnectScreenShot(IPEndPoint ep)
    {
        if (ScreenSocket != null)
        {
            ScreenSocket.Dispose();
            ScreenSocket = null;
        }
        if (ms != null)
        {
            ms.Dispose();
            ms = null;
        }
        ScreenSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        ScreenSocket.Connect(ep);
        ms = new MemoryStream();
        Rectangle bounds = Screen.GetBounds(Point.Empty);
        using (Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height))
        {
            using (Graphics g = Graphics.FromImage(bitmap))
            {
                g.CopyFromScreen(Point.Empty, Point.Empty, bitmap.Size);
            }
            bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
        }
    }

Why is that happening and how would i fix it?

Update: It works when i use ImageFormat.Jpeg Instead of ImageFormat.Png, but i still need a PNG format.

it worked with me this way :

• When a client wants to a receive a screenshot, you need to know image size before transferring starts.
  Call GetScreenShotSize() to get the size of the image.

• Once you get the size, call GetScreenShot() to receive image data.

i used using (MemoryStream ms = new MemoryStream()) so now PNG format is working.

    private Image img = null;
    public long GetScreenShotSize()
    {
        Rectangle bounds = Screen.GetBounds(Point.Empty);
        using (Bitmap bmp = new Bitmap(bounds.Width, bounds.Height))
        {
            using (Graphics g = Graphics.FromImage(bmp))
            {
                g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size);
            }
            using (MemoryStream ms = new MemoryStream())
            {
                bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                img = Image.FromStream(ms);
                return ms.Length;
            }
        }
    }
    public void GetScreenShot(IPEndPoint ep)
    {
        using (Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
        {
            socket.Connect(ep);
            using (MemoryStream ms = new MemoryStream())
            {
                img.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                socket.Send(ms.ToArray(), SocketFlags.None);
            }
            img.Dispose();
            img = null;
        }
    }