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Posted 3 Oct 2006

IP and Port from TcpClient

, 3 Oct 2006
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How to get the TCP/IP address of a TCPClient using VB.NET and Reflection.


This article explains how to get the TCP/IP address of a TCPClient using VB.NET and Reflection.

This is a fairly simple solution...You must use PropertyInfo from Reflection to reference the private socket of your TCPClient, and then pull the IP from the RemoteEndPoint of your Socket. I added a small class to make this a little cleaner and to return the address info as a separate IP address and port.

Public Shared Function AddressInfoFromTCPClient(ByVal theClient As TcpClient) As AddressInfo
    Dim pi As PropertyInfo = theClient.GetStream.GetType.GetProperty("Socket", _
                             BindingFlags.NonPublic Or BindingFlags.Instance)
    Dim theSocket As Socket = pi.GetValue(theClient.GetStream, Nothing)
    Dim theEnd As EndPoint = theSocket.RemoteEndPoint
    Dim theAddress() As String = theEnd.ToString.Split(":")
    Dim theInfo As New AddressInfo(theAddress(0), theAddress(1))

    Return theInfo
End Function

Hopefully this will be helpful to someone...I have used it quite a bit for small chat applications to keep track of banned IP addresses etc., while still having the ease of using TCPClient instead of sockets. Feel free to use this in your software as long as you do not hold me responsible for any damages ;)


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Software Developer (Senior)
United States United States
PC Programmer/Analyst

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Comments and Discussions tcpclient Pin
dragon4125-Jul-07 19:07
memberdragon4125-Jul-07 19:07 
QuestionSending Text Pin
hariram2814-Oct-06 6:27
memberhariram2814-Oct-06 6:27 
AnswerRe: Sending Text Pin
Polymorpher16-Oct-06 8:39
memberPolymorpher16-Oct-06 8:39 
GeneralRemoting Pin
hariram2811-Oct-06 6:47
memberhariram2811-Oct-06 6:47 
GeneralRe: Remoting Pin
Polymorpher11-Oct-06 7:02
memberPolymorpher11-Oct-06 7:02 
QuestionRe: Remoting Pin
hariram2811-Oct-06 7:23
memberhariram2811-Oct-06 7:23 
AnswerRe: Remoting Pin
Polymorpher11-Oct-06 7:39
memberPolymorpher11-Oct-06 7:39 
I'm sorry, I am getting ready to go to work so I dont have time to put together a sample at this time. However here is a sugestion:

First you will have to avoid the issue of two clients editing data at the same time, because you will lose data that way...

Second I would use strings to instantiate the objects and make the design something like this:

client->request string from server
client->translate string into object
client->edit object
client->translate object into string
client->return string to server
server->translate string into object
server->process object
server->wait for next request

If there is sensitive material in the string...encrypt it before sending it back and forth.

Public Class StrHandler

Public Sub New(theStr as String)
dim vars() as String = theStr.Split(",")

m_Var1 = vars(0)
m_Var2 = vars(1)
m_Var2 = vars(2)

End Sub

Public Overrides Function ToString() As String
Return m_Var1 & "," & m_Var2 & "," & m_Var3 etc, etc
End Function

End Class

Sometimes I think there's no reason to get out of bed . . . then I feel wet, and I realize there is.

GeneralAlternative Method Pin
Tom Spink9-Oct-06 15:40
memberTom Spink9-Oct-06 15:40 
GeneralRe: Alternative Method Pin
Polymorpher9-Oct-06 20:16
memberPolymorpher9-Oct-06 20:16 
GeneralRe: Alternative Method Pin
Manjunathabe0114-Feb-09 22:06
memberManjunathabe0114-Feb-09 22:06 
AnswerRe: Alternative Method Pin
Tom Spink5-Feb-09 1:27
memberTom Spink5-Feb-09 1:27 

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