private void ExitChat()
{
Message message = new Message()
{
Content = $"*{userName} has left the chat*", SenderPort = localPort, Type = messageType.Leave
};
byte[] data = ByteParser.ObjToByteArray(message);
udpClient.Send(data, data.Length, host, remotePort);
udpClient.DropMulticastGroup(groupAddress);
online = false;
udpClient.Close();
chatTextBlock.Inlines.Add($"\n({DateTime.Now.ToShortTimeString()}) *You has left the chat*");
loginButton.IsEnabled = true;
logoutButton.IsEnabled = false;
sendButton.IsEnabled = false;
saveButton.IsEnabled = true;
userNameTextBox.IsReadOnly = false;
localPortTextBox.IsReadOnly = false;
remotePortTextBox.IsReadOnly = false;
hostAddressTextBox.IsReadOnly = false;
}
private void sendButton_Click(object sender, EventArgs e)
{
if (messageTextBox.Text.Trim().Length == 0)
{
return;
}
try
{
Message message = new Message()
{
Content = $"{userName}: {messageTextBox.Text.Trim()}", SenderPort = localPort, Type = messageType.Message
};
byte[] data = ByteParser.ObjToByteArray(message);
udpClient.Send(data, data.Length, host, remotePort);
messageTextBox.Clear();
scrollViewer.ScrollToEnd();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void loginButton_Click(object sender, EventArgs e)
{
if (userNameTextBox.Text.Trim().Length == 0)
{
userNameTextBox.Clear();
return;
}
userName = userNameTextBox.Text.Trim();
userNameTextBox.IsReadOnly = true;
try
{
udpClient = new UdpClient(localPort);
udpClient.JoinMulticastGroup(groupAddress, TTL);
Task receiveTask = new Task(ReceiveMessages);
receiveTask.Start();
Message message = new Message()
{
Content = $"*{userName} joined the chat*", SenderPort = localPort, Type = messageType.Join
};
byte[] data = ByteParser.ObjToByteArray(message);
udpClient.Send(data, data.Length, host, remotePort);
localPortTextBox.IsReadOnly = true;
remotePortTextBox.IsReadOnly = true;
hostAddressTextBox.IsReadOnly = true;
saveButton.IsEnabled = false;
loginButton.IsEnabled = false;
logoutButton.IsEnabled = true;
sendButton.IsEnabled = true;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void ReceiveMessages()
{
online = true;
try
{
while (online)
{
IPEndPoint remoteIp = null;
byte[] data = udpClient.Receive(ref remoteIp);
Message message = (Message)ByteParser.ByteArrayToObj(data);
switch (message.Type)
{
case messageType.Confirm:
Dispatcher.Invoke(new Action(delegate
{
chatTextBlock.Inlines.Add($"\n*message #{message.Id} delivered*");
}));
break;
case messageType.Message:
Dispatcher.Invoke(new Action(delegate
{
if (message.SenderPort == localPort)
{
chatTextBlock.Inlines.Add($"\n[#{message.Id}]({DateTime.Now.ToShortTimeString()}) {message.Content}");
}
else
{
chatTextBlock.Inlines.Add($"\n({DateTime.Now.ToShortTimeString()}) {message.Content}");
}
}));
Message responseMessage = new Message()
{
Type = messageType.Confirm, Id = message.Id, SenderPort = localPort
};
byte[] newData = ByteParser.ObjToByteArray(responseMessage);
udpClient.Send(newData, newData.Length, host, remotePort);
break;
case messageType.Join:
Dispatcher.Invoke(new Action(delegate
{
if (chatTextBlock.Text.Length > 0)
{
chatTextBlock.Inlines.Add("\n");
}
chatTextBlock.Inlines.Add($"({DateTime.Now.ToShortTimeString()}) {message.Content}");
}));
break;
case messageType.Leave:
Dispatcher.Invoke(new Action(delegate
{
chatTextBlock.Inlines.Add($"\n({DateTime.Now.ToShortTimeString()}) {message.Content}");
}));
break;
case messageType.ServerShutDown:
Dispatcher.Invoke(new Action(delegate
{
ExitChat();
MessageBox.Show("Server shut down");
chatTextBlock.Inlines.Clear();
}));
break;
}
}
}
catch (ObjectDisposedException)
{
if (!online)
{
return;
}
throw;
}
catch (SocketException ex) when(ex.ErrorCode == 10004)
{
return;
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}