Question

I’ve got a problem to make two applications to send text-data between themselves.
The message is transmitted without any problems, the answer is received too. But, there is a lot of a “New line” char in the end of the string send/received on each side.
I guess it’s because of I’m reading the full buffer; I’ve tried to remove all Chr(10) and Chr(13); I also tried to trim the string, but it didn’t worked.

Here the code I use :

Client Side :

Dim cl As New TcpClient
cl.Connect("127.0.0.1", 2000)
Dim str As NetworkStream = cl.GetStream
Dim HelloInBytes As Byte() = Encoding.UTF8.GetBytes("Hello")
str.Write(HelloInBytes, 0, HelloInBytes.Length)
Dim Buffer(cl.ReceiveBufferSize) As Byte
str.Read(Buffer, 0, cl.ReceiveBufferSize)
Console.WriteLine(Encoding.UTF8.GetChars(Buffer))

Server Side :

Dim srv As New TcpListener(IPAddress.Any, 2000)
srv.Start()
Dim cl As TcpClient = srv.AcceptTcpClient
Dim str As NetworkStream = cl.GetStream
Dim buf(cl.ReceiveBufferSize) As Byte
str.Read(buf, 0, cl.ReceiveBufferSize)
Dim res As Byte() = Encoding.UTF8.GetBytes("World")
str.Write(res, 0, res.Length)

Is there a way to “clean” the received string ?

Thanks for help.

EDIT : Solution :
It Works with Harzcle solution.
I found another solution which is to use this function on the received string :

Public Function CleanString(ByRef Str As String)
    Return Str.Replace(Encoding.UTF8.GetChars({0, 0, 0, 0}), Nothing)
End Function

UTF8 works on 4 bytes, and when I read the stream and I put it into a buffer, if there is no char, the 4 bytes stay on a 0 value.

Answer 1

Use Flush() after you write into the buffer

str.Write(HelloInBytes, 0, HelloInBytes.Length)
str.Flush()

And

str.Write(res, 0, res.Length)
str.Flush()

---

Edit:

You can use a delimiter or something like that.

Client side:

Dim delimiterChar as Char = "|"
Dim out As Byte() = System.Text.Encoding.UTF8.GetBytes(txtOut.Text + delimiterChar)
server.Write(outStream, 0, outStream.Length)
server.Flush()

And Server side:

Dim delimiterChar as Char = "|"
Dim Stream As NetworkStream = clientSocket.GetStream()
Stream.Read(bytesFrom, 0, CInt(client.ReceiveBufferSize))
Dim data As String = System.Text.Encoding.UTF8.GetString(bytesFrom)
data = data.Substring(0, data.IndexOf(delimiterChar)) 'From 0 to delimiter