Hi,
I am testing a Tcp client C# windows form application I am able to send data to Tcp server Software(Hercules 3.2.8) But when i sent data from Tcp server to windows form then i am getting the following error:
System.InvalidOperationException: Cross-Thread operation not valid: Control 'MessageList' accessed from a thread other than the threa it was control on. at System.Windows.Forms.ListBox.ObjectCollection.Add(Object item)
at WindowsFormsAppication1.Form1.MessageCallBack(IAsyncResult ar) in From1.cs:line 55
Line 44 is at Messagelist.items.Add(response);
public partial class Form1 : Form
{
Socket sck;
EndPoint remoteEp;
byte[] buffer;
IPAddress ip = IPAddress.Parse("192.168.42.143");
int port = 8061;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
RemoteIptxt.Text = ip.ToString();
Remoteporttxt.Text = port.ToString();
//setup socket
sck = new Socket(ip.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
sck.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
}
private void Connectbtn_Click(object sender, EventArgs e)
{
//binding socket
remoteEp = new IPEndPoint(IPAddress.Parse(RemoteIptxt.Text), Convert.ToInt32(Remoteporttxt.Text));
sck.Connect(remoteEp);
buffer = new byte[1500];
sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref remoteEp, new AsyncCallback(MessageCallBack), buffer);
}
private void MessageCallBack(IAsyncResult ar)
{
try
{
byte[] receiveData = new byte[1500];
receiveData = (byte[])ar.AsyncState;
//Converting byte[] to string
ASCIIEncoding ascencoding = new ASCIIEncoding();
string response = ascencoding.GetString(receiveData);
//Adding message to listbox
MessageList.Items.Add(response);
buffer = new byte[1500];
sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref remoteEp, new AsyncCallback(MessageCallBack), buffer);
}
catch (Exception e)
{
MessageBox.Show(e.ToString());
}
}
private void buttonSend_Click(object sender, EventArgs e)
{
//convert string message to byte[]
ASCIIEncoding ascencoding = new ASCIIEncoding();
byte[] sendmess = new byte[1500];
sendmess = ascencoding.GetBytes(textMessage.Text);
sck.Send(sendmess);
MessageList.Items.Add("You Said:" + textMessage.Text);
textMessage.Text = "";
}
}
}