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Old July 15th, 2003, 01:09 AM
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Default Socket Programming in Window Service

Hi Folks,

I got program, which I want to run in a windows Service environment and need an Installer inbuilt. I need to implement even Read & Write data from Client to Server in a buffer, which i have to insert into database.

I have a sample program accessing the client Machine from the server.
I 'd appreciate any tips or solution in this regard

thanks in advance


'This is a server program
Imports System
Imports System.Net
Imports System.Net.Sockets
Imports System.Text
Imports System.Threading

' State object for reading client data asynchronously
Public Class StateObject
    ' Client socket.
    Public workSocket As Socket = Nothing
    ' Size of receive buffer.
    Public Const BufferSize As Integer = 1024
    ' Receive buffer.
    Public buffer(BufferSize) As Byte
    ' Received data string.
    Public sb As New StringBuilder()
End Class 'StateObject

Public Class AsynchronousSocketListener

    ' Incoming data from the client.
    Public Shared data As String = Nothing

    ' Thread signal.
    Public Shared allDone As New ManualResetEvent(False)

    Public Sub New()
    End Sub 'New

    Public Shared Sub StartListening()
        ' Data buffer for incoming data.
        Dim bytes() As Byte = New [Byte](1024) {}

        ' Establish the local endpoint for the socket.
        ' The DNS name of the computer
        ' running the listener is "host.contoso.com".
        Dim ipHostInfo As IPHostEntry = Dns.Resolve(Dns.GetHostName())
        Dim ipAddress As IPAddress = ipHostInfo.AddressList(0)
        Dim localEndPoint As New IPEndPoint(ipAddress, 11000)

        ' Intializes a TCP/IP socket.
        Dim listener As New Socket(AddressFamily.InterNetwork, _
            SocketType.Stream, ProtocolType.Tcp)

        ' Bind the socket to the local endpoint and listen for incoming
        ' connections.

            While True
                ' Set the event to nonsignaled state.

                ' Start an asynchronous socket to listen for connections.
                Console.WriteLine("Waiting for a connection...")
                listener.BeginAccept(New AsyncCallback(AddressOf AcceptCallback), _

                ' Wait until a connection is made before continuing.
            End While

        Catch e As Exception
        End Try

        Console.WriteLine(ControlChars.Cr + "Press ENTER to continue...")
    End Sub 'StartListening

    Public Shared Sub AcceptCallback(ar As IAsyncResult)
        ' Signal the main thread to continue.

        ' Get the socket that handles the client request.
        Dim listener As Socket = CType(ar.AsyncState, Socket)
        Dim handler As Socket = listener.EndAccept(ar)

        ' Create the state object.
        Dim state As New StateObject()
        state.workSocket = handler
        handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, _
            New AsyncCallback(AddressOf ReadCallback), state)
    End Sub 'AcceptCallback

    Public Shared Sub ReadCallback(ar As IAsyncResult)
        Dim content As [String] = [String].Empty

        ' Retrieve the state object and the handler socket
        ' from the asynchronous state object.
        Dim state As StateObject = CType(ar.AsyncState, StateObject)
        Dim handler As Socket = state.workSocket

        ' Read data from client socket.
        Dim bytesRead As Integer = handler.EndReceive(ar)

        If bytesRead > 0 Then
            ' There might be more data, so store the data received so far.
            state.sb.Append(Encoding.ASCII.GetString(state.buf fer, 0, _

            ' Check for end-of-file tag. If it is not there, read
            ' more data.
            content = state.sb.ToString()
            If content.IndexOf("<EOF>") > - 1 Then
                ' All the data has been read from the
                ' client. Display it on the console.
                Console.WriteLine("Read {0} bytes from socket. " + _
                    ControlChars.Cr + " Data : {1}", content.Length, content)
                ' Echo the data back to the client.
                Send(handler, content)
                ' Not all data received. Get more.
                handler.BeginReceive(state.buffer, 0,StateObject.BufferSize, _
                    0, New AsyncCallback(AddressOf ReadCallback), state)
            End If
        End If
    End Sub 'ReadCallback

    Private Shared Sub Send(handler As Socket, data As [String])
        ' Convert the string data to byte data using ASCII encoding.
        Dim byteData As Byte() = Encoding.ASCII.GetBytes(data)

        ' Begin sending the data to the remote device.
        handler.BeginSend(byteData, 0, byteData.Length, 0, _
            New AsyncCallback(AddressOf SendCallback), handler)
    End Sub 'Send

    Private Shared Sub SendCallback(ar As IAsyncResult)
            ' Retrieve the socket from the state object.
            Dim handler As Socket = CType(ar.AsyncState, Socket)

            ' Complete sending the data to the remote device.
            Dim bytesSent As Integer = handler.EndSend(ar)
            Console.WriteLine("Sent {0} bytes to client.", bytesSent)


        Catch e As Exception
        End Try
    End Sub 'SendCallback

    'Entry point that delegates to C-style main Private Function.
    Public Overloads Shared Sub Main()
        System.Environment.ExitCode = _
    End Sub

    Overloads Public Shared Function Main(args() As [String]) As Integer
        Return 0
    End Function 'Main
End Class 'AsynchronousSocketListener

Ramesh Bharatha
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