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How to get the clients IP address using TcpClient in Managed C++

, 10 Apr 2002 218K 36
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How to get the clients IP address using TcpClient in Managed C++
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In managed C++ using sockets, Microsoft is giving you a whole set of new tools to use Sockets. So you don't have to create a class to handle Client and Server communications. These classes are TcpListener for the server and TcpClient .

TcpListener * pTcpListener;
TcpListener = new TcpListener(80);
TcpClient * pTcpClient; 
pTcpClient = m_TcpListener->AcceptTcpClient();

This opens port 80 and listens for connections. When a client connects to port 80, the function AcceptTcpClient() returns with a TcpClient class.

Those two classes together are very powerful. You should create a thread to use the TcpClient and wait again to accept another client.

The problem I had is I need it to get the IP address of the Client. I couldn't find the way to get it from the TcpClient, even after I get the Stream like this:

 NetworkStream * networkStream = pTcpClient->GetStream();
networkStream->Read(bytes, 0, (int) pTcpClient->ReceiveBufferSize);

Now that I had a NetworkStream I thought I could get the IP address, well I was wrong again. networkStream->getSocket() is a private member of the class NetworkStream.

So, to resolve this problem I had to create a derived class from NetworkStream:

#pragma once

__gc class MyNetworkStream : public NetworkStream
	MyNetworkStream(void) : NetworkStream(0) { };
	MyNetworkStream(System::Net::Sockets::Socket * s) : NetworkStream(s) { };
	System::Net::Sockets::Socket * get_MySocket();
	String * get_IPAddress(void);

//MyNetworkStream.cpp file
#using <System.dll>
#using <mscorlib.dll>
using System::Net::Sockets::NetworkStream;
using System::String;

#include "myNetworkStream.h"

System::Net::Sockets::Socket * MyNetworkStream::get_MySocket()

String * MyNetworkStream::get_IPAddress(void)
	System::Net::Sockets::Socket *soc = get_Socket();
	System::Net::EndPoint		*Endp = soc->get_RemoteEndPoint();


So when you have this class, you only have to do something like that to get the client's IP address and socket:

NetworkStream * networkStream = pTcpClient->GetStream(); 
MyNetworkStream * myStream =  static_cast<MyNetworkStream *>(networkStream);
ClientIP = myStream->get_IPAddress();
Console::Write(S"Client IP Address ");
networkStream->Read(bytes, 0, (int) pTcpClient->ReceiveBufferSize);

There you go! IP address and everything. Now if you don't use TcpClient, you could AcceptSocket() instead of AcceptTcpClient() to get the socket. When you have the socket you can use get_RemoteEndPoint(), but I thought that you will like to use TcpClient.

Have fun!


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About the Author

Albert Pascual
Web Developer
United States United States
Al is just another Software Engineer working in C++, ASp.NET and C#. Enjoys snowboarding in Big Bear, and wait patiently for his daughters to be old enough to write code and snowboard.

Al is a Microsoft ASP.NET MVP


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Comments and Discussions

QuestionUrgent Question Answer? Pin
BNKRAJ29-Oct-07 23:31
memberBNKRAJ29-Oct-07 23:31 
Questionwhat? Pin
System.Object21-Jul-06 12:21
memberSystem.Object21-Jul-06 12:21 
Answerusing TcpClient's property Pin
evoisard3-Jul-08 5:14
memberevoisard3-Jul-08 5:14 
Generalhi! Pin
scootz334512-Jul-05 18:25
sussscootz334512-Jul-05 18:25 
GeneralRe: hi! Pin
Albert Pascual13-Jul-05 4:54
memberAlbert Pascual13-Jul-05 4:54 
GeneralRe: hi! (Need Help ) Pin
patilabhijit10-Apr-07 3:57
memberpatilabhijit10-Apr-07 3:57 
GeneralThe code seems to be wrong. Pin
Huanlin Tsai7-May-05 0:46
memberHuanlin Tsai7-May-05 0:46 
Generalneed some guide... Pin
chal_adiera23-Mar-05 23:10
memberchal_adiera23-Mar-05 23:10 
GeneralRe: need some guide... Pin
mmatchyn18-Nov-05 13:54
membermmatchyn18-Nov-05 13:54 
GeneralI need This in c++ directly using winsock, not using MFC Pin
Anonymous20-Mar-04 14:20
sussAnonymous20-Mar-04 14:20 
Generalthanks for the description Pin
Adam Jones17-Nov-03 11:11
memberAdam Jones17-Nov-03 11:11 
GeneralThanks very much Pin
Anonymous23-Mar-04 3:21
sussAnonymous23-Mar-04 3:21 
GeneralRe: thanks for the description - in C++ Pin
AndyKEnZ4-Dec-07 2:59
memberAndyKEnZ4-Dec-07 2:59 
Thanks Adam,

This compiles:

// get client IP using reflection
Type* pStreamType = aClientNetworkStream->GetType();

System::Reflection::PropertyInfo* pPropertyInfo
= pStreamType->GetProperty( S"Socket"
, static_cast< System::Reflection::BindingFlags >( System::Reflection::BindingFlags::NonPublic | System::Reflection::BindingFlags::Instance ) );

Socket* pClientSocket = static_cast< Socket* >( pPropertyInfo->GetValue( this->aClientNetworkStream, 0 ) );

EndPoint* pClientEndpoint = pClientSocket->RemoteEndPoint;

String* pClientIpAddress = pClientEndpoint->ToString();
Generalthe result includes port # Pin
duhduhduh20-Feb-03 20:02
memberduhduhduh20-Feb-03 20:02 
GeneralI need this in Pin
SoTTo29-Oct-02 4:39
sussSoTTo29-Oct-02 4:39 
GeneralRe: I need this in Pin
Pete Bassett29-Oct-02 7:46
memberPete Bassett29-Oct-02 7:46 
GeneralRe: I need this in Pin
Pete Bassett29-Oct-02 7:52
memberPete Bassett29-Oct-02 7:52 
GeneralRe: I need this in Pin
Ken Ng18-Jan-03 8:48
sussKen Ng18-Jan-03 8:48 
GeneralRe: I need this in Pin
linge23-May-06 21:51
memberlinge23-May-06 21:51 
GeneralRe: I need this in Pin
Polymorpher13-Mar-06 18:47
memberPolymorpher13-Mar-06 18:47 
Questioncan u make this code in to Java Pin
sxdoss5-May-02 20:08
membersxdoss5-May-02 20:08 
AnswerRe: can u make this code in to Java Pin
Anonymous13-Jun-02 18:14
memberAnonymous13-Jun-02 18:14 
QuestionCan you do this with C# Pin
Adam Byrne29-Apr-02 4:48
memberAdam Byrne29-Apr-02 4:48 
AnswerRe: Can you do this with C# Pin
Albert Pascual29-Apr-02 11:31
memberAlbert Pascual29-Apr-02 11:31 
GeneralRe: Can you do this with C# Pin
akarwa23-Jun-05 23:29
memberakarwa23-Jun-05 23:29 

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