TCPListener Thread Closing

Ontani

Ontani

Well-known member
Joined
Mar 3, 2004
Messages
119
Location
Belgium
Hey i got a simple tcp server/client application.
and i have the listening on the port 6666 in a thread.
it keeps listening till the client connects and then it closes the thread.
but i want it to keep the thread running so that another client can connect.

Code: 
    Const portNumber As Integer = 6666
    Dim tcpListener As New tcpListener(portNumber)
    Dim listenThread As System.Threading.Thread

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
         Must listen on correct port- must be same as port client wants to connect on.
        tcpListener.Start()
        listenThread = New System.Threading.Thread(AddressOf doListen)
        listenThread.IsBackground = True
        listenThread.Start()
        Debug.WriteLine("Waiting for connection...")
    End Sub

    Public Sub doListen()
        Accept the pending client connection and return 
        a TcpClient initialized for communication. 
        Dim tcpClient As TcpClient = tcpListener.AcceptTcpClient()
        Debug.WriteLine("Connection accepted.")
         Get the stream
        Dim networkStream As NetworkStream = tcpClient.GetStream()
         Read the stream into a byte array
        Dim bytes(tcpClient.ReceiveBufferSize) As Byte
        networkStream.Read(bytes, 0, CInt(tcpClient.ReceiveBufferSize))
         Return the data received from the client to the console.
        Dim clientdata As String = Encoding.ASCII.GetString(bytes)
        Console.WriteLine(("Client sent: " + clientdata))
        Dim responseString As String = "Connected to server."
        Dim sendBytes As [Byte]() = Encoding.ASCII.GetBytes(responseString)
        networkStream.Write(sendBytes, 0, sendBytes.Length)
        Console.WriteLine(("Message Sent /> : " + responseString))
        Any communication with the remote client using the TcpClient can go here.
        Close TcpListener and TcpClient.
        tcpClient.Close()
        Console.WriteLine("exit")
    End Sub
thats my server code

this is my client code
Code: 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Try
            Dim tcpClient As New System.Net.Sockets.TcpClient()
            tcpClient.Connect("127.0.0.1", 6666)
            Dim networkStream As NetworkStream = tcpClient.GetStream()
            If networkStream.CanWrite And networkStream.CanRead Then
                 Do a simple write.
                Dim sendBytes As [Byte]() = Encoding.ASCII.GetBytes("Is anybody there")
                networkStream.Write(sendBytes, 0, sendBytes.Length)
                 Read the NetworkStream into a byte buffer.
                Dim bytes(tcpClient.ReceiveBufferSize) As Byte
                networkStream.Read(bytes, 0, CInt(tcpClient.ReceiveBufferSize))
                 Output the data received from the host to the console.
                Dim returndata As String = Encoding.ASCII.GetString(bytes)
                Console.WriteLine(("Host returned: " + returndata))
            Else
                If Not networkStream.CanRead Then
                    Console.WriteLine("cannot not write data to this stream")
                    tcpClient.Close()
                Else
                    If Not networkStream.CanWrite Then
                        Console.WriteLine("cannot read data from this stream")
                        tcpClient.Close()
                    End If
                End If
            End If
        Catch d As Exception
            MessageBox.Show(d.ToString)
        End Try
    End Sub

my server debug:
Waiting for connection...
Connection accepted.
Client sent: Is anybody there
The thread <No Name> (0x105c) has exited with code 0 (0x0).

Greetz
 
You would need to implement some form of loop so when you have finished with a client you would go back and start waiting for another client to connect.
 
Back
Top