Converting sent byte array via socket to string

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?

Why do you ignore size and assume the entire buffer contains relevant data? — CodeCaster
– CodeCaster, Commented Dec 29, 2015 at 18:06
can you please add the code how you initialize the socket? thanks. — cramopy
– cramopy, Commented Dec 29, 2015 at 18:35

Tobias Knauss · Accepted Answer · 2015-12-29 18:03:21Z

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.

answered Dec 29, 2015 at 18:03

Tobias Knauss

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