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Old October 23rd, 2008, 10:27 PM
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Default problem retrieving data processed by class library

Pls help! how am i going to update a form's listbox with data handled and stored by a class library ( the messages are from a connected socket)?
I want this listbox to diplay chat messages.

class X (class library code)

properties: ipadd,port,isconnected...etc
    Connect() and ConnectCallback //will establish connection to the socket using BeginConnect and EndConnect
    WaitForData and OnDataReceived(Callback) //will received the messages using BeginReceive and EndReceive

        public void WaitForData()
            recieveCallback = new AsyncCallback(onDataReceived);
            StateObject socket = new StateObject();
            socket.workSocket = mainClientSocket;
            result = mainClientSocket.BeginReceive(socket.buffer, 0, socket.buffer.Length, SocketFlags.None, recieveCallback, socket);

        private void onDataReceived(IAsyncResult result)
            StateObject socket = (StateObject)result.AsyncState;
            if (mainClientSocket.Connected)

                bytesRcvd = socket.workSocket.EndReceive(result);
                ReadXML(bytesReceived, socket); //method that will parse the message

        private void ReadXML(int bytes, StateObject socket)
          Once data is parsed , it will be stored in SenderMessageList ///(List<string>)
            SenderMessageQueue(Sender + ": " + Message);
        private void SenderMessageQueue(String message, String socketID)

        public String getSenderMessage //// I will call this property in a form to display //// the stored message
                return SenderMessageList[SenderMessageList.Count - 1];

Form // will use the library

namespace WindowsFormsApplication4
            using X;
            x= new X.ClientSocket();
            IntPtr handle = this.Handle;
            x.IPadd = "";
            x.Port = 8222;

            ThreadStart threadStarter = new ThreadStart(ReceiveMessages);
            myThread = new Thread(threadStarter);
            myThread.IsBackground = true;

        private void ReceiveMessages()

            while (x.bytesReceived != 0)
                 listBox1.Invoke(new UpdateTextCallback(this.Update_listBox1), new object[] { a });

            listBox1.Invoke(new UpdateTextCallback(this.Update_listBox1), new object[] { x.getSenderMessage });

        private void Update_listBox1(String text)

        private void ButtonSend_click{

When i move the listbox.invoke in ButtonSend, i can get the stored message..But what i want to do is automate the receiving of data..Sending has no problem cause it's working...I am by the way creating a chat program..i want to see all the messages coming in...Thanks.

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