通过套接字将发送的字节数组转换为字符串

Question

I'm working on small LAN chat application where connection is via sockets.

As you can see on the image, the original byte Array is badly encoded to string. My guess is that somwhere in connection somewhat happens.

Sending: (Here shuldnt be a problem)

           byte[] message = new byte[Encoding.UTF8.GetByteCount(txtPisanie.Text)];
            message = Encoding.UTF8.GetBytes(txtPisanie.Text);
            sck.Send(message);
            txtChat.Items.Add("Me: " + Encoding.UTF8.GetString(message));
            txtPisanie.Clear();

Async callback:

    int size = sck.EndReceiveFrom(aResult, ref epRemote);
            if (size > 0)
            {
                byte[] receiveData = new byte[((byte[])aResult.AsyncState).Length];
                receiveData = (byte[])aResult.AsyncState;
                string receivedMessage = Encoding.UTF8.GetString(receiveData);
                this.Dispatcher.Invoke((Action)(() => {
                    txtChat.Items.Add("Friend: " + receivedMessage);
                    Write("Friend: " + receivedMessage);
                }));
            }
            byte[] buffer = new byte[1500];
            sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(MessageCallBack), buffer);

Connection:

   epLocal = new IPEndPoint(IPAddress.Parse(txtIPLocal.Text), Convert.ToInt32(txtPortLocal.Text));
            sck.Bind(epLocal);

            epRemote = new IPEndPoint(IPAddress.Parse(txtIPRemote.Text), Convert.ToInt32(txtPortRemote.Text));
            sck.Connect(epRemote);

            byte[] buffer = new byte[1500];
            sck.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref epRemote, new AsyncCallback(MessageCallBack), buffer);

Initializing sockets:

        sck = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
        sck.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);

Any thoughts about this?

Answer 1

How many squares do you get?
I think you either send a too large array, where the 'unfilled' bytes are zero, or you create such an array at the receiver side.
Debug your application! You can use network terminal programs to manually send data via TCP vor UDP.

I suggest Sysinternals TCPView to monitor the connection and the amount of transmitted data, and HWGroup Hercules as network terminal software.