private void btnSend_Click(object sender, EventArgs e)
{
try
{
// Initialise a packet object to store the data to be sent
Packet sendData = new Packet();
sendData.ChatName = this.name;
sendData.ChatMessage = txtMessage.Text.Trim();
sendData.ChatDataIdentifier = DataIdentifier.Message;
// Get packet as byte array
byte[] byteData = sendData.GetDataStream();
// Send packet to the server
clientSocket.BeginSendTo(byteData, 0, byteData.Length, SocketFlags.None, epServer, new AsyncCallback(this.SendData), null);
txtMessage.Text = string.Empty;
}
catch (Exception ex)
{
MessageBox.Show("Send Error: " + ex.Message, "UDP Client", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
private void Client_FormClosing(object sender, FormClosingEventArgs e)
{
try
{
if (this.clientSocket != null)
{
// Initialise a packet object to store the data to be sent
Packet sendData = new Packet();
sendData.ChatDataIdentifier = DataIdentifier.LogOut;
sendData.ChatName = this.name;
sendData.ChatMessage = null;
// Get packet as byte array
byte[] byteData = sendData.GetDataStream();
// Send packet to the server
this.clientSocket.SendTo(byteData, 0, byteData.Length, SocketFlags.None, epServer);
// Close the socket
this.clientSocket.Close();
}
}
catch (Exception ex)
{
MessageBox.Show("Closing Error: " + ex.Message, "UDP Client", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
private void btnConnect_Click(object sender, EventArgs e)
{
try
{
this.name = txtName.Text.Trim();
// Initialise a packet object to store the data to be sent
Packet sendData = new Packet();
sendData.ChatName = this.name;
sendData.ChatMessage = null;
sendData.ChatDataIdentifier = DataIdentifier.LogIn;
// Initialise socket
this.clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
// Initialise server IP
IPAddress serverIP = IPAddress.Parse(txtServerIP.Text.Trim());
// Initialise the IPEndPoint for the server and use port 30000
IPEndPoint server = new IPEndPoint(serverIP, 30000);
// Initialise the EndPoint for the server
epServer = (EndPoint)server;
// Get packet as byte array
byte[] data = sendData.GetDataStream();
// Send data to server
clientSocket.BeginSendTo(data, 0, data.Length, SocketFlags.None, epServer, new AsyncCallback(this.SendData), null);
// Initialise data stream
this.dataStream = new byte[1024];
// Begin listening for broadcasts
clientSocket.BeginReceiveFrom(this.dataStream, 0, this.dataStream.Length, SocketFlags.None, ref epServer, new AsyncCallback(this.ReceiveData), null);
}
catch (Exception ex)
{
MessageBox.Show("Connection Error: " + ex.Message, "UDP Client", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
private void ReceiveData(IAsyncResult ar)
{
try
{
// Receive all data
this.clientSocket.EndReceive(ar);
// Initialise a packet object to store the received data
Packet receivedData = new Packet(this.dataStream);
// Update display through a delegate
if (receivedData.ChatMessage != null)
this.Invoke(this.displayMessageDelegate, new object[] { receivedData.ChatMessage });
// Reset data stream
this.dataStream = new byte[1024];
// Continue listening for broadcasts
clientSocket.BeginReceiveFrom(this.dataStream, 0, this.dataStream.Length, SocketFlags.None, ref epServer, new AsyncCallback(this.ReceiveData), null);
}
catch (ObjectDisposedException)
{ }
catch (Exception ex)
{
MessageBox.Show("Receive Data: " + ex.Message, "UDP Client", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
private void ReceiveData(IAsyncResult asyncResult)
{
try
{
byte[] data;
// Initialise a packet object to store the received data
Packet receivedData = new Packet(this.dataStream);
// Initialise a packet object to store the data to be sent
Packet sendData = new Packet();
// Initialise the IPEndPoint for the clients
IPEndPoint clients = new IPEndPoint(IPAddress.Any, 0);
// Initialise the EndPoint for the clients
EndPoint epSender = (EndPoint)clients;
// Receive all data
serverSocket.EndReceiveFrom(asyncResult, ref epSender);
// Start populating the packet to be sent
sendData.ChatDataIdentifier = receivedData.ChatDataIdentifier;
sendData.ChatName = receivedData.ChatName;
switch (receivedData.ChatDataIdentifier)
{
case DataIdentifier.Message:
sendData.ChatMessage = string.Format("{0}: {1}", receivedData.ChatName, receivedData.ChatMessage);
break;
case DataIdentifier.LogIn:
// Populate client object
Client client = new Client();
client.endPoint = epSender;
client.name = receivedData.ChatName;
// Add client to list
this.clientList.Add(client);
sendData.ChatMessage = string.Format("-- {0} is online --", receivedData.ChatName);
break;
case DataIdentifier.LogOut:
// Remove current client from list
foreach (Client c in this.clientList)
{
if (c.endPoint.Equals(epSender))
{
this.clientList.Remove(c);
break;
}
}
sendData.ChatMessage = string.Format("-- {0} has gone offline --", receivedData.ChatName);
break;
}
// Get packet as byte array
data = sendData.GetDataStream();
foreach (Client client in this.clientList)
{
if (client.endPoint != epSender || sendData.ChatDataIdentifier != DataIdentifier.LogIn)
{
// Broadcast to all logged on users
serverSocket.BeginSendTo(data, 0, data.Length, SocketFlags.None, client.endPoint, new AsyncCallback(this.SendData), client.endPoint);
}
}
// Listen for more connections again...
serverSocket.BeginReceiveFrom(this.dataStream, 0, this.dataStream.Length, SocketFlags.None, ref epSender, new AsyncCallback(this.ReceiveData), epSender);
// Update status through a delegate
this.Invoke(this.updateStatusDelegate, new object[] { sendData.ChatMessage });
}
catch (Exception ex)
{
MessageBox.Show("ReceiveData Error: " + ex.Message, "UDP Server", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}