TCP Socket c# Project to LV

[KTM_Lex]

Hello i have a little Problem.

I want to upgrad an old program with an 3rd party TCP Client to LV

The Server accept the following protocoll

length of message [2 byte]

Message [n byte]

EOT [1byte]

the 3rd Party sends the data with the following code

private static void SendBytes(string data, Stream nwstream) //adjusts bytes to protocoll
        {
            byte[] ba = Encoding.UTF8.GetBytes(data);
            byte[] bstart = BitConverter.GetBytes(Convert.ToInt16(ba.Length));
            byte eot = 0x04;
            //Adjust Bytes to Protocoll
        for (int i = 0; i < bstart.Length; i++) //message length
            {
                nwstream.WriteByte(bstart[i]);
            }

            for (int i = 0; i < ba.Length; i++) //message length
            {
                nwstream.WriteByte(ba[i]);
            }

            nwstream.WriteByte(eot); //Message Endoftransmission
        }

        private static string sendtoServer(string xmldata)
        {
            TcpClient tcpclnt = new TcpClient();
            try
            {
                tcpclnt.Connect(ipadress, port);
            }
            catch
            {

                System.IO.File.WriteAllText("/home/pi/files/init/error.txt","NoConnection");
                System.Environment.Exit(1);
            }
            Stream nwstream = tcpclnt.GetStream();
            SendBytes(xmldata, nwstream);
            StreamReader nwreader = new StreamReader(nwstream, Encoding.UTF8);
            String response;
            try
            {
                response = nwreader.ReadToEnd();
            }
            finally
            {
                nwreader.Close();
            }

            tcpclnt.Close();
            return response;
        }

Maby someone can help me

best regards

Alex

[rolfk]

Do you want to create equivalent LabVIEW code for your C# code or is it about creating a TCP/IP Server that can handle this C# client?

[KTM_Lex]

Hello and thanks for replay

i want to create an equivalent LV code

best regards

Alex

[rolfk · Accepted solution]

This is pretty much it.

But there might be something with the TCP Read. LabVIEW doesn't really know the equivalent of Stream.ReadToEnd, since there is no clearly defined end. Standard mode might work, and if your response can get bigger than 1000 bytes you would have to increase the number of bytes to read.

[KTM_Lex]

Thanks for the very fast replay, its perfect

i tryed it with many other moduls but i didn't get the right way to send the message length and eot 

thanks so many times