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

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10 Apr 20021 min read 260K   40   31
How to get the clients IP address using TcpClient in Managed C++

Introduction

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);
TcpListener->Start(); 
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:

//MyNetworkStream.h
#pragma once

__gc class MyNetworkStream : public NetworkStream
{
public:
	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()
{
	return(this->get_Socket());
}

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

	return(Endp->ToString());
}

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 ");
Console::WriteLine(ClientIP);
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!

License

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Written By
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

 
GeneralRe: I need this in vb.net Pin
Pete Bassett29-Oct-02 7:46
Pete Bassett29-Oct-02 7:46 
GeneralRe: I need this in vb.net Pin
Pete Bassett29-Oct-02 7:52
Pete Bassett29-Oct-02 7:52 
GeneralRe: I need this in vb.net Pin
Member 56031918-Jan-03 8:48
Member 56031918-Jan-03 8:48 
GeneralRe: I need this in vb.net Pin
linge23-May-06 21:51
linge23-May-06 21:51 
GeneralRe: I need this in vb.net Pin
Polymorpher13-Mar-06 18:47
Polymorpher13-Mar-06 18:47 
Questioncan u make this code in to Java Pin
5-May-02 20:08
suss5-May-02 20:08 
AnswerRe: can u make this code in to Java Pin
13-Jun-02 18:14
suss13-Jun-02 18:14 
QuestionCan you do this with C# Pin
29-Apr-02 4:48
suss29-Apr-02 4:48 
As far as I've been able to find out, you can't statically cast in C#, so the CLR will throw an Invalid cast exception or something when you try to dynamically cast something to a derived type. Is there a way to do this in C#??

-Adam
AnswerRe: Can you do this with C# Pin
Albert Pascual29-Apr-02 11:31
sitebuilderAlbert Pascual29-Apr-02 11:31 
GeneralRe: Can you do this with C# Pin
akarwa23-Jun-05 23:29
akarwa23-Jun-05 23:29 
AnswerRe: Can you do this with C# Pin
User 22514406-Oct-07 14:05
User 22514406-Oct-07 14:05 

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