Book recommendations?

Book recommendations?

• Dave.H

  I tried to enter the code to make a Layer 3 network tap. Today, I got it working without the errors I had before. I ran into one problem though, that prevented me from running it, and I don't understand the error. System.InvalidOperationException was unhandled Message="Cross-thread operation not valid: Control 'lbPackets' accessed from a thread other than the thread it was created on." So do you still have this issue What this means is that you are trying to update controls on a form from a thread that is used to callback your Callback function. If you lookinto MSDN there are specific examples of how you can fix this.

  
  
  

• kkting

  Eventhough it is based on 1.1 version, the are very few changes at the
  socket level. You could work around these issues by looking up
  in the msdn. There are no books on 2.0 yet that I know of.
  What exactly are the issues you are having
  
  

• Kevin Farlee

  Thanks. I don't know enough to know what to look for to fix this though. I think the error might actually have a link to how to do that, so I'll check. Thank you for your help.
  

• Brice FROMENTIN

  Another .net socket book out there is "Professional .NET Network Programming". It duplicates MSDN too much but has some decent content to get you started.
  
  

• Max Iturra

  I tried to enter the code to make a Layer 3 network tap.  Today, I got it working without the errors I had before.  I ran into one problem though, that prevented me from running it, and I don't understand the error.

  System.InvalidOperationException was unhandled
    Message="Cross-thread operation not valid: Control 'lbPackets' accessed from a thread other than the thread it was created on."
   

   Here's my code:

  Imports System

  Imports System.Windows.Forms

  Imports System.Net.Sockets

  Imports System.Net

  Imports System.Threading

  Imports System.text

  Public Class Form1

  Public listener As Threading.Thread

  Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

  End Sub

  Private Sub btnStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnStart.Click

  btnStart.Enabled = False

  btnStop.Enabled = True

  listener = New Threading.Thread(New Threading.ThreadStart(AddressOf Run))

  listener.Start()

  End Sub

  Private Sub btnStop_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnStop.Click

  btnStart.Enabled = True

  btnStop.Enabled = False

  If Not listener Is Nothing Then

  listener.Abort()

  listener.Join()

  listener = Nothing

  End If

  End Sub

  Public Sub Run()

  Dim len_receive_buf As Integer = 4096

  Dim len_send_buf As Integer = 4096

  Dim receive_buf() As Byte = New Byte(len_receive_buf) {}

  Dim send_buf() As Byte = New Byte(len_send_buf) {}

  Dim cout_receive_bytes As Integer

  Dim socket As Net.Sockets.Socket = New _

  Net.Sockets.Socket(Net.Sockets.AddressFamily.InterNetwork, _

  Net.Sockets.SocketType.Raw, Net.Sockets.ProtocolType.IP)

  socket.Blocking = False

  Dim IPHost As Net.IPHostEntry = _

  Net.Dns.GetHostByName(Net.Dns.GetHostName())

  socket.Bind(New _

  Net.IPEndPoint(Net.IPAddress.Parse _

  (IPHost.AddressList(0).ToString()), 0))

  socket.SetSocketOption(Net.Sockets.SocketOptionLevel.IP, _

  Net.Sockets.SocketOptionName.HeaderIncluded, 1)

  Dim bIN As Byte() = New Byte() {1, 0, 0, 0}

  Dim bOUT As Byte() = New Byte() {0, 0, 0, 0}

  Dim SIO_RCVALL As Integer = &H98000001

  Dim ret_code As Integer = socket.IOControl _

  (SIO_RCVALL, bIN, bOUT)

  Do

  Dim ar As IAsyncResult = socket.BeginReceive _

  (receive_buf, 0, _

  len_receive_buf, Net.Sockets.SocketFlags.None, Nothing, Me)

  cout_receive_bytes = socket.EndReceive(ar)

  Receive(receive_buf, cout_receive_bytes)

  Loop

  End Sub

  Public Sub Receive(ByVal buf As Byte(), ByVal len As Integer)

  If buf(9) = 6 Then

  lbPackets.Items.Add(Encoding.ASCII.getstring _

  (buf).replace(Chr(0), " "))

  End If

  End Sub

  End Class

  
  

• nizzy8

  Well what errors are you getting
  
  

• William R

  The issues I'm having are just that some of the syntax is obsolete, and I don't know enough about VB to know what's wrong or how to make it work with the new .NET. Visual Studio did give me help in letting me know how to change some of the syntax, but I'm not sure about all of it. I'd really like to keep the book though, if I can figure it out, because it's exactly what I need.
  
• Book recommendations?