Get the actual data length read from network stream

RadhaKrishnaKiJaya
RadhaKrishnaKiJaya used Ask the Experts™
on
Hi Experts,

I am reading data from a RFID reader using network stream. But the length of the data is always 8193. What can I do to get the actual length.
Thanks in advance.

Dim tcpClient As New TcpClient("192.145.1.80", "10001")
             Dim netStream As NetworkStream = TcpClient.GetStream()
             If netStream.CanRead Then
                 ' Reads the NetworkStream into a byte buffer.
                 Dim bytes(TcpClient.ReceiveBufferSize) As Byte
                 ' Read can return anything from 0 to numBytesToRead.  
                 ' This method blocks until at least one byte is read.
                 netStream.Read(bytes, 0, CInt(TcpClient.ReceiveBufferSize))

                 ' Returns the data received from the host to the console.
                Dim ReturnData As String = Encoding.ASCII.GetString(bytes)
                 TextBox1.Text = ReturnData  'Length is always 8193
                RaiseEvent TCPDataIn(ReturnData)
             Else
                 Console.WriteLine("You cannot read data from this stream.")
                 TcpClient.Close()
                 ' Closing the tcpClient instance does not close the network stream.
                 netStream.Close()
                 Return
             End If
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Commented:
NetworkStream.Read returns thenumber of bytes read, which you are not storing.

Dim numberOfBytesRead As Integer = 0
' ... as before
numberOfBytesRead = netStream.Read(bytes, 0, CInt(TcpClient.ReceiveBufferSize))

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You are then free to use numberOfBytesRead in your output or to examine it.
Mike TomlinsonHigh School Computer Science, Computer Applications, Digital Design, and Mathematics Teacher
Top Expert 2009

Commented:
Adding to mrwad99's answer, use "numberOfBytesRead" in Encoding.ASCII.GetString():
Dim ReturnData As String = Encoding.ASCII.GetString(bytes, 0, numberOfBytesRead)

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Commented:
Thank you very much. It worked.

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