Imports System
Imports System.IO
Imports System.Net
Imports System.Net.Sockets
Imports System.Text
Imports Microsoft.VisualBasic
 
Module Server
 
    Sub Main()
 
        server_start()
        '  Console.WriteLine(ControlChars.Cr + "Hit enter to continue....")
        ' Console.Read()
 
    End Sub
 
    Sub server_start()
        Dim server As TcpListener
        server = Nothing
        Try
            ' Set the TcpListener on port 13000.
            Dim port As Int32 = 5000
            REM Dim localAddr As IPAddress = IPAddress.Parse("127.0.0.1")
            Dim localAddr As IPAddress = Dns.GetHostEntry(Dns.GetHostName( _
              )).AddressList(0)
            server = New TcpListener(localAddr, port)
 
            ' 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
                Console.Write("Waiting for a connection... ")
 
                ' Perform a blocking call to accept requests.
                ' You could also user server.AcceptSocket() here.
                Dim client As TcpClient = server.AcceptTcpClient()
                Console.WriteLine("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)
 
                ' stream.ReadTimeout = 10000
                'stream.WriteTimeout = 10000
 
                While (i <> 0)
                    ' Translate data bytes to a ASCII string.
                    data = System.Text.Encoding.ASCII.GetString(bytes, 0, i)
                    Worker(data)
                    Console.WriteLine("Received: {0}", data)
 
                    ' Process the data sent by the client.
                    data = data.ToUpper()
                    Dim msg As Byte() = System.Text.Encoding.ASCII.GetBytes( _
                      data)
 
                    ' Send back a response.
                    stream.Write(msg, 0, msg.Length)
                    Console.WriteLine("Sent: {0}", data)
 
                    i = stream.Read(bytes, 0, bytes.Length)
 
 
 
 
                End While
 
                ' Shutdown and end connection
 
                client.Close()
            End While
        Catch e As SocketException
 
            Console.WriteLine("SocketException: {0}", e)
 
        Catch ex As IOException
 
            Console.WriteLine(ex.Message)
            server.Stop()
            server_start()
 
        Finally
            server.Stop()
 
        End Try
    End Sub
 
End Module