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Visual Studio 2012 TCP Connections

Posted on 2014-11-05
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Last Modified: 2014-11-08
Hello,

 I was a traditional VB6 code writer and have been transitioning to Visual Studio 2012 Visual Basic.  For the most part I have gotten myself “up to speed” on most things.  But there are still some differences between the two versions that I need assistance with.

 In my current issue, I am trying to establish a TCP connection to another host computer.  In VB6 I would use a .connect to attach to the host server and then use the DataArrival method to capture the incoming packets as they happened.  I am unsure how to continuously “read” data using Visual Studio 2012 Visual Basic.

 I have used the below code as my example.  Where there are two buttons labeled BUTTON1 and BUTTON2.  I use BUTTON1 to connect to the server and then BUTTON2 would retrieve the data that is streaming from the host server and display it in the textbox labeled TEXTBOX1.

 My question is, how do I capture the data continuously without having to initiating BUTTON2?  Do I have to setup a separate thread to do this process or is there a VB6 similar DataArrival function?

 Thanks

 Imports System.Net.Sockets
 Imports System.Net
 Imports System.Text

 Public Class Form1
     Dim tcpClient As New System.Net.Sockets.TcpClient()
     Public Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

         Dim networkStream As NetworkStream = TcpClient.GetStream()
         Dim sendBytes As [Byte]() = Encoding.ASCII.GetBytes("computer1")

         networkStream.Write(sendBytes, 0, sendBytes.Length)
     End Sub

     Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
         tcpClient.Connect("xxx.xxx.xxx.xxx", 39500)
     End Sub
     Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
         Dim networkStream As NetworkStream = tcpClient.GetStream()

         Dim bytes(tcpClient.ReceiveBufferSize) As Byte
         NetworkStream.Read(bytes, 0, CInt(tcpClient.ReceiveBufferSize))
         Dim returndata As String = Encoding.ASCII.GetString(bytes)

         TextBox1.Text = returndata
     End Sub
 End Class
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Question by:ADEZOYSA1
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by:it_saige
ID: 40425454
You are correct, in .NET there are, literally, many different solutions to this problem.  At it's most basic are the System.Net.Sockets.Tcp* classes.  Creating a project using this can be accomplished quite easily.  Here is a great example to use:

http://www.codeproject.com/Articles/38914/A-TCP-IP-Chat-Program

-saige-
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Mike Tomlinson earned 500 total points
ID: 40427461
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Author Closing Comment

by:ADEZOYSA1
ID: 40430836
excellent article.
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