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

, 10 Apr 2002
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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


Comments and Discussions

GeneralMy vote of 5 Pingrouparid0814-Jan-13 0:06 
Questioninclude files? Pinmemberbkelly1321-Oct-10 18:16 
GeneralIs there a way to sent stream out through a specific IP in a multi-IP server PinmemberErickJackob3-May-09 17:10 
General[Message Deleted] Pinmemberit.ragester2-Apr-09 22:42 
QuestionHow to pass TcpClient^ to a function as an argument? PinmemberAlwaysStudent10-Nov-07 20:06 
QuestionUrgent Question Answer? PinmemberBNKRAJ30-Oct-07 0:31 
Questionwhat? PinmemberSystem.Object21-Jul-06 13:21 
Answerusing TcpClient's property Pinmemberevoisard3-Jul-08 6:14 
Generalhi! Pinsussscootz334512-Jul-05 19:25 
GeneralRe: hi! PinmemberAlbert Pascual13-Jul-05 5:54 
GeneralRe: hi! (Need Help ) Pinmemberpatilabhijit10-Apr-07 4:57 
GeneralThe code seems to be wrong. PinmemberHuanlin Tsai7-May-05 1:46 
Generalneed some guide... Pinmemberchal_adiera24-Mar-05 0:10 
hi AL...

I am a new beginner in socket
Your article very good n give me some guide how to create the class in .net
I want to implement that in my code but the basic stage still got trouble...
I don't no how to fixed it...

I have 2 file..server n client..
This code no error and can connected.
But the output not display..

Error is << String reference not set to an instance of a String >>
->Byte data[] = Encoding::ASCII->GetBytes(s);
what that mean?

can you help me...
see my code..
void main()
Int32 port = 80;
IPAddress* localAddr = IPAddress::Parse(S"");

TcpListener* server = new TcpListener(localAddr, port);


Byte bytes[] = new Byte[256];
String* data = 0;

while (true)
Console::Write(S"Waiting for a connection... ");

TcpClient* client = server->AcceptTcpClient();

data = 0;

NetworkStream* stream = client->GetStream();

Int32 i;

while (i = stream->Read(bytes, 0, bytes->Length))
data = Encoding::ASCII->GetString(bytes, 0, i);
Console::WriteLine(String::Format(S"Received: {0}", data));

data = data->ToUpper();

Byte msg[] = Text::Encoding::ASCII->GetBytes(data);

stream->Write(msg, 0, msg->Length);
Console::WriteLine(String::Format(S"Sent: {0}", data));

catch (SocketException* e)
Console::WriteLine(S"SocketException: {0}", e);

Console::WriteLine(S"\nHit enter to continue...");
CLIENT file:

String* Connect(String* server, String* message)
try {

Int32 port = 80;
TcpClient* client = new TcpClient(server,port);

Byte data[] = Encoding::ASCII->GetBytes(message);

NetworkStream* stream = client->GetStream();

stream->Write(data, 0, data->Length);

Console::WriteLine(S"Sent: {0}", message);

String* responseData = String::Empty;

Int32 bytes = stream->Read(data, 0, data->Length);
responseData =Encoding::ASCII->GetString(data, 0, bytes);
Console::WriteLine(S"Received: {0}", responseData);


} catch (ArgumentNullException* e) {
Console::WriteLine(S"ArgumentNullException: {0}", e);
} catch (SocketException* e) {
Console::WriteLine(S"SocketException: {0}", e);

Console::WriteLine(S"\n Press Enter to continue...");

int main()

String* message;
String* server;

String* result = Connect(server,message);


GeneralRe: need some guide... Pinmembermmatchyn18-Nov-05 14:54 
GeneralI need This in c++ directly using winsock, not using MFC PinsussAnonymous20-Mar-04 15:20 
Generalthanks for the description PinmemberAdam Jones17-Nov-03 12:11 
GeneralThanks very much PinsussAnonymous23-Mar-04 4:21 
GeneralRe: thanks for the description - in C++ PinmemberAndyKEnZ4-Dec-07 3:59 
Generalthe result includes port # Pinmemberduhduhduh20-Feb-03 21:02 
GeneralI need this in PinsussSoTTo29-Oct-02 5:39 
GeneralRe: I need this in PinmemberPete Bassett29-Oct-02 8:46 
GeneralRe: I need this in PinmemberPete Bassett29-Oct-02 8:52 
GeneralRe: I need this in PinsussKen Ng18-Jan-03 9:48 
GeneralRe: I need this in Pinmemberlinge23-May-06 22:51 
GeneralRe: I need this in PinmemberPolymorpher13-Mar-06 19:47 
Questioncan u make this code in to Java Pinmembersxdoss5-May-02 21:08 
AnswerRe: can u make this code in to Java PinmemberAnonymous13-Jun-02 19:14 
QuestionCan you do this with C# PinmemberAdam Byrne29-Apr-02 5:48 
AnswerRe: Can you do this with C# PinmemberAlbert Pascual29-Apr-02 12:31 
GeneralRe: Can you do this with C# Pinmemberakarwa24-Jun-05 0:29 
AnswerRe: Can you do this with C# Pinmemberkalmi106-Oct-07 15:05 

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