Imports System.Net.Sockets
Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Vom Windows Form Designer generierter Code "

    Public Sub New()
        MyBase.New()

        ' Dieser Aufruf ist fьr den Windows Form-Designer erforderlich.
        InitializeComponent()

        ' Initialisierungen nach dem Aufruf InitializeComponent() hinzufьgen

    End Sub

    ' Die Form ьberschreibt den Lцschvorgang der Basisklasse, um Komponenten zu bereinigen.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    ' Fьr Windows Form-Designer erforderlich
    Private components As System.ComponentModel.IContainer

    'HINWEIS: Die folgende Prozedur ist fьr den Windows Form-Designer erforderlich
    'Sie kann mit dem Windows Form-Designer modifiziert werden.
    'Verwenden Sie nicht den Code-Editor zur Bearbeitung.
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(72, 200)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(144, 32)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Button1"
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(80, 24)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(144, 24)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "Label1"
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(80, 72)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(144, 32)
        Me.Label2.TabIndex = 2
        Me.Label2.Text = "Label2"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.Button1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Sub Connect(ByVal server As [String], ByVal message As [String]
        Try
            ' Create a TcpClient.
            ' Note, for this client to work you need to have a TcpServer
            ' connected to the same address as specified by the server, port
            ' combination.
            Dim port As Int32 = 13000
            Dim client As New TcpClient(server, port)

            ' Translate the passed message into ASCII and store it as a Byte array.
            Dim data As [Byte]) = System.Text.Encoding.ASCII.GetBytes(message)

            ' Get a client stream for reading and writing.
            '  Stream stream = client.GetStream();
            Dim stream As NetworkStream = client.GetStream()

            ' Send the message to the connected TcpServer.
            stream.Write(data, 0, data.Length)

            'Console.WriteLine("Sent: {0}", message)

            Label1.Text = "Sent: " + message

            ' Receive the TcpServer.response.
            ' Buffer to store the response bytes.
            data = New [Byte]256) {}

            ' String to store the response ASCII representation.
            Dim responseData As [String] = [String].Empty

            ' Read the first batch of the TcpServer response bytes.
            Dim bytes As Int32 = stream.Read(data, 0, data.Length)
            responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes)

            'Console.WriteLine("Received: {0}", responseData)
            Label2.Text = "Received:" + responseData

            ' Close everything.
            client.Close()
        Catch e As ArgumentNullException
            Console.WriteLine("ArgumentNullException: {0}", e)
        Catch e As SocketException
            Console.WriteLine("SocketException: {0}", e)
        End Try

        'Console.WriteLine(ControlChars.Cr + " Press Enter to continue..."
        'Console.Read()
    End Sub 'Connect

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Connect("127.0.0.1", "Clien hochet Connect"
    End Sub
End Class
 

Imports System.Net
Imports System.Net.Sockets
Public Class Form1
    Inherits System.Windows.Forms.Form
    Dim port As Int32 = 13000
    Dim localAddr As IPAddress = IPAddress.Parse("127.0.0.1"

    Dim server As New TcpListener(localAddr, port)
#Region " Vom Windows Form Designer generierter Code "

    Public Sub New()
        MyBase.New()

        ' Dieser Aufruf ist fьr den Windows Form-Designer erforderlich.
        InitializeComponent()

        ' Initialisierungen nach dem Aufruf InitializeComponent() hinzufьgen

    End Sub

    ' Die Form ьberschreibt den Lцschvorgang der Basisklasse, um Komponenten zu bereinigen.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    ' Fьr Windows Form-Designer erforderlich
    Private components As System.ComponentModel.IContainer

    'HINWEIS: Die folgende Prozedur ist fьr den Windows Form-Designer erforderlich
    'Sie kann mit dem Windows Form-Designer modifiziert werden.
    'Verwenden Sie nicht den Code-Editor zur Bearbeitung.
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents Button2 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Button1 = New System.Windows.Forms.Button
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.Label3 = New System.Windows.Forms.Label
        Me.Button2 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(56, 160)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(104, 24)
        Me.Button1.TabIndex = 0
        Me.Button1.Text = "Button1"
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(40, 24)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(184, 32)
        Me.Label1.TabIndex = 1
        Me.Label1.Text = "Label1"
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(32, 72)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(192, 40)
        Me.Label2.TabIndex = 2
        Me.Label2.Text = "Label2"
        '
        'Label3
        '
        Me.Label3.Location = New System.Drawing.Point(32, 120)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(192, 32)
        Me.Label3.TabIndex = 3
        Me.Label3.Text = "Label3"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(56, 200)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(96, 24)
        Me.Button2.TabIndex = 4
        Me.Button2.Text = "Button2"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.Button1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Try
            ' Set the TcpListener on port 13000.

            ' Start listening for client requests.
            server.Start()

            ' Buffer for reading data
            Dim bytes(1024) As [Byte]
            Dim data As [String] = Nothing

            ' Enter the listening loop.
            While True
                Label1.Text = "Waiting for a connection... "

                ' Perform a blocking call to accept requests.
                ' You could also user server.AcceptSocket() here.
                Dim client As TcpClient = server.AcceptTcpClient()

                Connect("127.0.0.1", "Clien hochet Connect"

                Label1.Text = "Connected!"

                data = Nothing

                ' Get a stream object for reading and writing
                Dim stream As NetworkStream = client.GetStream()

                Dim i As Int32

                ' Loop to receive all the data sent by the client.
                i = stream.Read(bytes, 0, bytes.Length)
                While (i <> 0)
                    ' Translate data bytes to a ASCII string.
                    data = System.Text.Encoding.ASCII.GetString(bytes, 0, i)
                    Label2.Text = "Received: {0}" + data

                    ' Process the data sent by the client.
                    data = data.ToUpper()
                    data = "Sam pridurok. Otwet ot servera"

                    Dim msg As [Byte]) = System.Text.Encoding.ASCII.GetBytes(data)

                    ' Send back a response.
                    stream.Write(msg, 0, msg.Length)
                    Label3.Text = "Sent: " + data

                    i = stream.Read(bytes, 0, bytes.Length)

                End While

                ' Shutdown and end connection
                client.Close()
            End While
        Catch ex As SocketException
            'Label1.Text = ([String].Format("SocketException: {0}", ex))
        End Try

       
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        server.Stop()
    End Sub

    Sub Connect(ByVal server As [String], ByVal message As [String]
        Try
            ' Create a TcpClient.
            ' Note, for this client to work you need to have a TcpServer
            ' connected to the same address as specified by the server, port
            ' combination.
            Dim port As Int32 = 13000
            Dim client As New TcpClient(server, port)

            ' Translate the passed message into ASCII and store it as a Byte array.
            Dim data As [Byte]) = System.Text.Encoding.ASCII.GetBytes(message)

            ' Get a client stream for reading and writing.
            '  Stream stream = client.GetStream();
            Dim stream As NetworkStream = client.GetStream()

            ' Send the message to the connected TcpServer.
            stream.Write(data, 0, data.Length)

            'Console.WriteLine("Sent: {0}", message)

            Label1.Text = "Sent: " + message

            ' Receive the TcpServer.response.
            ' Buffer to store the response bytes.
            data = New [Byte]256) {}

            ' String to store the response ASCII representation.
            Dim responseData As [String] = [String].Empty

            ' Read the first batch of the TcpServer response bytes.
            Dim bytes As Int32 = stream.Read(data, 0, data.Length)
            responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes)

            'Console.WriteLine("Received: {0}", responseData)
            Label2.Text = "Received:" + responseData

            ' Close everything.
            client.Close()
        Catch e As ArgumentNullException
            Console.WriteLine("ArgumentNullException: {0}", e)
        Catch e As SocketException
            Console.WriteLine("SocketException: {0}", e)
        End Try

        'Console.WriteLine(ControlChars.Cr + " Press Enter to continue..."
        'Console.Read()
    End Sub 'Connect

    'Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    '   Connect("127.0.0.1", "Clien hochet Connect"
    'End Sub

End Class