Error on data receiving using socket Programing...

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Here is code snnipet where my code terminates by throwing an exception..

C#

public void OnDataReceived(IAsyncResult asyn)
          {
              try
              {
                  SocketPacket theSockId = (SocketPacket)asyn.AsyncState;
                  int iRx = theSockId.thisSocket.EndReceive(asyn);
                  char[] chars = new char[iRx + 1];
                  System.Text.Decoder d = System.Text.Encoding.UTF8.GetDecoder();
                  int charLen = d.GetChars(theSockId.dataBuffer, 0, iRx, chars, 0);
                  System.String szData = new System.String(chars);
                  richTextBox1.Text=richTextBox1.Text + szData[0];
                  //IT IS WHERE PROGRAM TERMINATES...              
                  WaitForData();
                 
              }
              catch (ObjectDisposedException)
              {
                  System.Diagnostics.Debugger.Log(0, "1", "\nOnDataReceived: Socket has been closed\n");
              }
              catch (SocketException se)
              {
                  MessageBox.Show(se.Message,"2");
             }
          }

How do i solve this exception...
Exception:
A first chance exception of type 'System.InvalidOperationException' occurred in System.Windows.Forms.dll
The program '[3908] Display screen.vshost.exe: Program Trace' has exited with code 0 (0x0).
The program '[3908] Display screen.vshost.exe: Managed (v4.0.30319)' has exited with code 0 (0x0).

Posted 27-Oct-12 18:18pm

Sharath2790

Updated 28-Oct-12 0:23am

v2

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2 solutions

Solution 1

Change to :

C#

StateObject so = (StateObject)asyn.AsyncState;
Socket s = so.workSocket;
int iRx = s.EndReceive(asyn);
if (iRx > 0) {
......

Posted 27-Oct-12 19:45pm

Kuthuparakkal

Comments

Sharath2790 28-Oct-12 1:53am

What is a StateObject??? is there any class called StateObject...

Kuthuparakkal 28-Oct-12 1:55am

Follow : http://msdn.microsoft.com/en-us/library/5w7b7x5f.aspx

Sharath2790 28-Oct-12 6:36am

Sorry!! That doesn't work either... Please Suggest me a simple example where one windows forms application sends data and another application receives and displays it...

Kuthuparakkal 28-Oct-12 10:45am

Try:
<a href= "http://csharp.net-informations.com/communications/csharp-socket-programming.htm">Socket</a>

Sharath2790 28-Oct-12 23:47pm

Thank you!!

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pietvredeveld · Accepted Answer · 2012-10-28T23:00:00

When the update of the textbox is made from an other thread, make the update through a delegate.

Sample code :

SynchronizationContext.Current.Send((state) =>
    {    
        richTextBox1.Text=richTextBox1.Text + szData[0];
    } 
, null);

See google for further reading on InvokeRequired and BeginInvoke or SynchronizationContext.Current

Piet