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POProper sending and receiving via C# sockets?
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copied!<p>I'm attempting to create a remote desktop server and client using C#. The server captures the screen and then sends it to the client via a socket. I'm using the code below although it only displays a part of the jpeg image on the client. I think this is because the image is sent in multiple packets and at the moment the code only reads the one packet and displays it. Can anyone explain how I would change my code so it receives multiple packets (the whole image) before displaying it.</p> <p><strong>Server code:</strong></p> <pre><code>Socket serverSocket; Socket clientSocket; public Form1() { InitializeComponent(); backgroundWorker1.RunWorkerAsync(); } private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { try { serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint ipEndPoint = new IPEndPoint(IPAddress.Any, 8221); serverSocket.Bind(ipEndPoint); serverSocket.Listen(4); //Accept the incoming clients serverSocket.BeginAccept(new AsyncCallback(OnAccept), null); } catch (Exception ex) { MessageBox.Show(ex.Message, "Stream Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } } private void timer1_Tick(object sender, EventArgs e) { timer1.Stop(); Rectangle bounds = new Rectangle(0, 0, 1280, 720); Bitmap bitmap = new Bitmap(bounds.Width, bounds.Height); using (Graphics g = Graphics.FromImage(bitmap)) { g.CopyFromScreen(Point.Empty, Point.Empty, bounds.Size); } System.IO.MemoryStream stream = new System.IO.MemoryStream(); ImageCodecInfo myImageCodecInfo; System.Drawing.Imaging.Encoder myEncoder; EncoderParameter myEncoderParameter; EncoderParameters myEncoderParameters; myEncoderParameters = new EncoderParameters(1); myImageCodecInfo = GetEncoderInfo("image/jpeg"); myEncoder = System.Drawing.Imaging.Encoder.Quality; myEncoderParameter = new EncoderParameter(myEncoder, 40L); myEncoderParameters.Param[0] = myEncoderParameter; bitmap.Save(stream, myImageCodecInfo, myEncoderParameters); byte[] imageBytes = stream.ToArray(); stream.Dispose(); clientSocket.Send(imageBytes); timer1.Start(); } </code></pre> <p>As you can see, I'm using a timer which has the interval set to 30 for sending the image bytes.</p> <p><strong>Client code:</strong></p> <pre><code>public Socket clientSocket; byte[] byteData = new byte[2048]; MemoryStream ms; public Form1() { InitializeComponent(); backgroundWorker1.RunWorkerAsync(); this.DoubleBuffered = true; } private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { try { clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); IPEndPoint ipEndPoint = new IPEndPoint(IPAddress.Parse("MY EXTERNAL IP HERE"), 8221); //Connect to the server clientSocket.BeginConnect(ipEndPoint, new AsyncCallback(OnConnect), null); } catch (Exception ex) { MessageBox.Show(ex.Message, "SGSclient", MessageBoxButtons.OK, MessageBoxIcon.Error); } } private void OnConnect(IAsyncResult ar) { try { //Start listening to the data asynchronously clientSocket.BeginReceive(byteData, 0, byteData.Length, SocketFlags.None, new AsyncCallback(OnReceive), null); } catch (Exception ex) { MessageBox.Show(ex.Message, "Stream Error", MessageBoxButtons.OK, MessageBoxIcon.Error); } } private void OnReceive(IAsyncResult ar) { try { int byteCount = clientSocket.EndReceive(ar); ms = new MemoryStream(byteData); using (BinaryReader br = new BinaryReader(ms)) { this.BackgroundImage = Image.FromStream(ms).GetThumbnailImage(this.ClientRectangle.Width, this.ClientRectangle.Height, null, IntPtr.Zero); } } catch (ArgumentException e) { //MessageBox.Show(e.Message); } clientSocket.BeginReceive(byteData, 0, byteData.Length, SocketFlags.None, new AsyncCallback(OnReceive), null); } </code></pre> <p>The client is meant to receive the image and then display it on the form's background.</p>

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