[RESOLVED] [2008] Can I add a TCPClient Component

[Atheist]

i dont need it to be more effective. im still trying to make my client and server connect!!
so the code u provide is only for the server not the client... ? right?
im not understanding the code... is it for 2 programs or is it only for the server?

if its only for the server, could you PLEASE show me how a client would connect..

In the specific post by me that you linked too, there is only code for the server side. But in the same thread, I've got examples for the client side aswell.
Anyway, I'll create one more example..

Server side:
Form:

Public Class Form1
    Private listener As System.Net.Sockets.TcpListener
    Private listenThread As System.Threading.Thread
 
    Private clients As New List(Of ConnectedClient) 'This list will store all connected clients.
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        listener = New System.Net.Sockets.TcpListener(System.Net.IPAddress.Any, 43001) 'The TcpListener will listen for incoming connections at port 43001
        listener.Start() 'Start listening.
        listenThread = New System.Threading.Thread(AddressOf doListen) 'This thread will run the doListen method
        listenThread.IsBackground = True 'Since we dont want this thread to keep on running after the application closes, we set isBackground to true.
        listenThread.Start() 'Start executing doListen on the worker thread.
    End Sub
 
    Private Sub doListen()
        Dim incomingClient As System.Net.Sockets.TcpClient
        Do
            incomingClient = listener.AcceptTcpClient 'Accept the incoming connection. This is a blocking method so execution will halt here until someone tries to connect.
            Dim connClient As New ConnectedClient(incomingClient, Me) 'Create a new instance of ConnectedClient (check its constructor to see whats happening now).
            AddHandler connClient.dataReceived, AddressOf Me.messageReceived
            clients.Add(connClient) 'Adds the connected client to the list of connected clients.
 
        Loop
    End Sub
 
    Public Sub removeClient(ByVal client As ConnectedClient)
        If clients.Contains(client) Then
            clients.Remove(client)
        End If
    End Sub
 
    Private Sub messageReceived(ByVal sender As ConnectedClient, ByVal message As String)
        'A message has been received from one of the clients.
        'To determine who its from, use the sender object.
        'sender.SendMessage can be used to reply to the sender.
 
        Dim data() As String = message.Split("|"c) 'Split the message on each | and place in the string array.
        Select Case data(0)
            Case "CONNECT"
                'We use GetClientByName to make sure no one else is using this username.
                'It will return Nothing if the username is free.
                'Since the client sent the message in this format: CONNECT|UserName, the username will be in the array on index 1.
                If GetClientByName(data(1)) Is Nothing Then
                    'The username is not taken, we can safely assign it to the sender.
                    sender.Username = data(1)
                End If
            Case "DISCONNECT"
                removeClient(sender)
        End Select
 
    End Sub
 
    Private Function GetClientByName(ByVal name As String) As ConnectedClient
        For Each cc As ConnectedClient In clients
            If cc.Username = name Then
                Return cc 'client found, return it.
            End If
        Next
        'If we've reached this part of the method, there is no client by that name
        Return Nothing
    End Function
End Class

ConnectedClient class:

Public Class ConnectedClient
    Private mClient As System.Net.Sockets.TcpClient
 
    Private mUsername As String
    Private mParentForm As Form1
    Private readThread As System.Threading.Thread
    Private Const MESSAGE_DELIMITER As Char = ControlChars.Cr
 
    Public Event dataReceived(ByVal sender As ConnectedClient, ByVal message As String)
 
    Sub New(ByVal client As System.Net.Sockets.TcpClient, ByVal parentForm As Form1)
        mParentForm = parentForm
        mClient = client
 
        readThread = New System.Threading.Thread(AddressOf doRead)
        readThread.IsBackground = True
        readThread.Start()
    End Sub
 
    Public Property Username() As String
        Get
            Return mUsername
        End Get
        Set(ByVal value As String)
            mUsername = value
        End Set
    End Property
 
    Private Sub doRead()
        Const BYTES_TO_READ As Integer = 255
        Dim readBuffer(BYTES_TO_READ) As Byte
        Dim bytesRead As Integer
        Dim sBuilder As New System.Text.StringBuilder
        Do
            bytesRead = mClient.GetStream.Read(readBuffer, 0, BYTES_TO_READ)
            If (bytesRead > 0) Then
                Dim message As String = System.Text.Encoding.UTF8.GetString(readBuffer, 0, bytesRead)
                If (message.IndexOf(MESSAGE_DELIMITER) > -1) Then
 
                    Dim subMessages() As String = message.Split(MESSAGE_DELIMITER)
 
                    'The first element in the subMessages string array must be the last part of the current message.
                    'So we append it to the StringBuilder and raise the dataReceived event
                    sBuilder.Append(subMessages(0))
                    RaiseEvent dataReceived(Me, sBuilder.ToString)
                    sBuilder = New System.Text.StringBuilder
 
                    'If there are only 2 elements in the array, we know that the second one is an incomplete message,
                    'though if there are more then two then every element inbetween the first and the last are complete messages:
                    If subMessages.Length = 2 Then
                        sBuilder.Append(subMessages(1))
                    Else
                        For i As Integer = 1 To subMessages.GetUpperBound(0) - 1
                            RaiseEvent dataReceived(Me, subMessages(i))
                        Next
                        sBuilder.Append(subMessages(subMessages.GetUpperBound(0)))
                    End If
                Else
 
                    'MESSAGE_DELIMITER was not found in the message, so we just append everything to the stringbuilder.
                    sBuilder.Append(message)
                End If
            End If
        Loop
    End Sub
 
    Public Sub SendMessage(ByVal msg As String)
        Dim sw As IO.StreamWriter
        Try
            SyncLock mClient.GetStream
                sw = New IO.StreamWriter(mClient.GetStream) 'Create a new streamwriter that will be writing directly to the networkstream.
                sw.Write(msg)
                sw.Flush()
            End SyncLock
        Catch ex As Exception
            MessageBox.Show(ex.ToString)
        End Try
        'As opposed to writing to a file, we DONT call close on the streamwriter, since we dont want to close the stream.
    End Sub
 
End Class

Client Side:
Form:

Public Class Form1
    Private client As System.Net.Sockets.TcpClient
 
    Private Const BYTES_TO_READ As Integer = 255
    Private readBuffer(BYTES_TO_READ) As Byte
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        client = New System.Net.Sockets.TcpClient("localhost", 43001)
        client.GetStream.BeginRead(readBuffer, 0, BYTES_TO_READ, AddressOf doRead, Nothing)
    End Sub
 
    Private Sub doRead(ByVal ar As System.IAsyncResult)
        Dim totalRead As Integer
        Try
            totalRead = client.GetStream.EndRead(ar) 'Ends the reading and returns the number of bytes read.
        Catch ex As Exception
            'The underlying socket have probably been closed OR an error has occured whilst trying to access it, either way, this is where you should remove close all eventuall connections
            'to this client and remove it from the list of connected clients.
        End Try
 
            If totalRead > 0 Then
                'the readBuffer array will contain everything read from the client.
                Dim receivedString As String = System.Text.Encoding.UTF8.GetString(readBuffer, 0, totalRead)
                messageReceived(receivedString)
            End If
 
            Try
                client.GetStream.BeginRead(readBuffer, 0, BYTES_TO_READ, AddressOf doRead, Nothing) 'Begin the reading again.
            Catch ex As Exception
                'The underlying socket have probably been closed OR an error has occured whilst trying to access it, either way, this is where you should remove close all eventuall connections
                'to this client and remove it from the list of connected clients.
            End Try
    End Sub
 
    Private Sub messageReceived(ByVal message As String)
        MessageBox.Show(message)
    End Sub
 
 
 
    Private Sub SendMessage(ByVal msg As String)
        Dim sw As IO.StreamWriter
        Try
            sw = New IO.StreamWriter(client.GetStream)
            sw.Write(msg)
            sw.Flush()
        Catch ex As Exception
            MessageBox.Show(ex.ToString)
        End Try
    End Sub
End Class

You need to add more exception handling and possibly some SyncLocks upon accessing the different Streams. There are also some important things that I've left out, such as removing a client from the list of connected client upon disconnection.
I've tried to put some comments in the code but dont hesitate to look the different methods/classes up on MSDN.

Edit: I intend to update this example some day soon.