problem in getting count of received data over UDP socket (clent-server chat app)

[low_pointer]

hi, i was trying to develop a client server app over udp network. i used listview to show the chat. But when user1 typed a very long sentence , the listview is showing the part of sentence (as its taking it in only one line). so i have written a logic to split the sentdata into lines if character count gets over 70. its works fine on server side but not working on the client side. i have set buffer array size to 2000. When i tried print the received data massage.length on a label , its always showing it as 2000. (and that is why, the logic is not working). whats causing this? how to overcome it? i want the character count in recieved message .. H E L P . M E.. (posting code with this)..


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;

using System.Threading;



namespace Chat_Chor
{
public partial class Form1 : Form
{
Socket sckt;
EndPoint epLocal, epRemote;
byte[] buffer;

public Form1()
{
InitializeComponent();
txtChat.Text = "";
}

private void Form1_Load(object sender, EventArgs e)
{
//setting up the socket
sckt = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
sckt.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);

//getting users IP
txtLocalIp.Text = GetIPLocal();
}

private string GetIPLocal()
{
IPHostEntry host;
host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)
if (ip.AddressFamily == AddressFamily.InterNetwork)
return ip.ToString();

return "127.0.0.1";
}

/* private string GetIPRemote()
{
IPEndPoint host;
host = Dns.GetHostEntry(Dns.GetHostName());
foreach (IPAddress ip in host.AddressList)
if (ip.AddressFamily == AddressFamily.InterNetwork)
return ip.ToString();

return "127.0.0.1";
}*/


private void groupBox1_Enter(object sender, EventArgs e)
{

}

private void buttonConnect_Click(object sender, EventArgs e)
{
if (buttonConnect.Text != "Disconnect !")
{
//binding socket to the Button
epLocal = new IPEndPoint(IPAddress.Parse(txtLocalIp.Text), Convert.ToInt32(txtLocalPort.Text));
sckt.Bind(epLocal);

//connecting to Remote IP

epRemote = new IPEndPoint(IPAddress.Parse(txtRemoteIp.Text), Convert.ToInt32(txtRemotePort.Text));
sckt.Connect(epRemote);

listView1.Columns.Add("",0, HorizontalAlignment.Left);
listView1.Columns.Add("starting chat . . .", 444, HorizontalAlignment.Left);


//listening to (receiving from) the specific port on Remote side
buffer = new byte[2000];
sckt.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(MessageCallBack), buffer);
buttonConnect.Text = "Disconnect !";
}
else
{
txtRemoteIp.Text = "";
buttonConnect.Text = "Connect";
}

}

private void MessageCallBack(IAsyncResult aResult)
{
try
{
if (buttonConnect.Text == "Disconnect !")
{
byte[] receivedData = new byte[2000];
receivedData = (byte[])aResult.AsyncState;

//converting byte[] to string
ASCIIEncoding aEncoding = new ASCIIEncoding();
string receivedMessage = aEncoding.GetString(receivedData);
Console.Beep();
Thread.Sleep(1000);
int l = Convert.ToInt32(receivedData.Length) ;
label2.Text = "";
label1.Text = l.ToString();
string[] arr = new string[2];
ListViewItem itm;
arr[0] = "";

string firstString = receivedMessage;
if (firstString.Length > 70)
{
firstString = firstString.Remove(70);
string renewedString = receivedMessage;
renewedString = renewedString.Remove(0, 70);
if (renewedString.Length > 70)
{
string secondstring = renewedString.Remove(70);
renewedString = renewedString.Remove(0, 70);

if (renewedString.Length <= 70)
{
string s = "Friend : " + firstString;
arr[1] = s;
itm = new ListViewItem(arr);
listView1.Items.Add(itm);

arr[1] = secondstring;
itm = new ListViewItem(arr);
listView1.Items.Add(itm);

arr[1] = renewedString;
itm = new ListViewItem(arr);
listView1.Items.Add(itm);
}
else
{
MessageBox.Show("message too long, reduce size !");
}


}
}
else
{
arr[1] = "Friend : " + firstString;
itm = new ListViewItem(arr);
listView1.Items.Add(itm);


}



//callbacking again
buffer = new byte[2000];
sckt.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(MessageCallBack), buffer);





}
}
catch(Exception ex)
{
MessageBox.Show("ERROR : " + ex.ToString());
}
}


private void buttonSend_Click(object sender, EventArgs e)
{
try
{
if (buttonConnect.Text == "Disconnect !")
{
//convert string message to byte[]
ASCIIEncoding aEncoding = new ASCIIEncoding();
byte[] sendData = new byte[2000];
sendData = aEncoding.GetBytes(txtChat.Text);
//sending the Encoded message
sckt.Send(sendData);

string[] arr = new string[2];
ListViewItem itm;
arr[0] = "";

string firstString = txtChat.Text;
if (firstString.Length > 70)
{
firstString = firstString.Remove(70);
string renewedString = txtChat.Text;
renewedString = renewedString.Remove(0, 70);
if (renewedString.Length > 70)
{
string secondstring = renewedString.Remove(70);
renewedString = renewedString.Remove(0, 70);

if (renewedString.Length <= 70)
{
string s = "me : " + firstString;
arr[1] = s;
itm = new ListViewItem(arr);
listView1.Items.Add(itm);

arr[1] = secondstring;
itm = new ListViewItem(arr);
listView1.Items.Add(itm);

arr[1] = renewedString;
itm = new ListViewItem(arr);
listView1.Items.Add(itm);
}
else
{
MessageBox.Show("message too long, reduce size !");
}


}
}
else
{
arr[1] = "Me123 : " + firstString;
itm = new ListViewItem(arr);
listView1.Items.Add(itm);
}

txtChat.Text = "";
}
else
{
MessageBox.Show("Sorry, Session Expired !");
}
}

catch (Exception ex)
{
MessageBox.Show("ERROR : " + ex.ToString());
}
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{

}

private void listView1_SelectedIndexChanged(object sender, EventArgs e)
{

}
}
}

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