StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POC# socket problem with receiving data
text
Body
copied!<p>I'm currently writing a test program for an network attached mircocontroller which controls a led light.</p> <p>When I'm trying to receive an answer from the remote host the whole procedure gets stuck in the socket.receive function.</p> <p>I'm sending a few bytes of data using a socket to the remote host. Then I listen for incomming data. But at the point where I receive the data the program just stops without an exception or anything.</p> <p>Send-Function : </p> <pre><code> public void Send(Command cmd) { switch (cmd.command) { case CommandType.SetAll: send_data(SET_COLOR_ALL, cmd.data, 3); break; case CommandType.SetRed: send_data(SET_COLOR_RED, cmd.data, 1); break; case CommandType.SetGreen: send_data(SET_COLOR_GREEN, cmd.data, 1); break; case CommandType.SetBlue: send_data(SET_COLOR_BLUE, cmd.data, 1); break; case CommandType.GetColor: Debug.WriteLine("Sending request..."); send_data(GET_COLOR, cmd.data, 0); read_data(); //here it gets stuck ! break; } m_socket.Disconnect(true); } </code></pre> <p>Extract from read_data()</p> <pre><code> private void read_data() { Debug.WriteLine("Called read_data()"); byte[] t_buffer = new byte[4]; try { if(!m_socket.Connected) m_socket.Listen(10000); sock_receive(m_socket, ref t_buffer, 0, t_buffer.Length, 10000); } catch (Exception ex) { throw ex; } finally { // do some stuff here } } </code></pre> <p>And here the sock_receive function where everything gets stuck :</p> <pre><code> public static void sock_receive(Socket socket,ref byte[] buffer, int offset, int size, int timeout) { int startTickCount = Environment.TickCount; int received = 0; // how many bytes is already received do { Debug.WriteLine("In Loop.."); if (Environment.TickCount > startTickCount + timeout) throw new Exception("Timeout."); try { //here it gets stuck ! received += socket.Receive(buffer, offset + received, size - received, SocketFlags.None); Debug.WriteLine("Byte arrived, received : " + received.ToString()); } catch (SocketException ex) { Debug.WriteLine("Socket exception !"); if (ex.SocketErrorCode == SocketError.WouldBlock || ex.SocketErrorCode == SocketError.IOPending || ex.SocketErrorCode == SocketError.NoBufferSpaceAvailable) { // socket buffer is probably empty, wait and try again Thread.Sleep(30); } else throw ex; // any serious error occurr } } while (received < size); } </code></pre> <p>I hope you guys can help me.</p> <p>Greetings</p> <p>n0pt3x</p>

Querying!

Guidance

An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload