Solved

Finding Ip address using sockets

Posted on 1998-01-12
1
187 Views
Last Modified: 2010-04-10
I need to find a way to know my own IP and to find the IP of another computer that is attached to another app through a socket connection.  I am using MFC and VC++ 5.0.  I have used sockets in many ways, but have never been able to find out the local machines IP with C++.
Thanks
Georg
0
Comment
Question by:georgh
1 Comment
 
LVL 32

Accepted Solution

by:
jhance earned 20 total points
ID: 1178205
Use the gethostbyname() WINSOCK function.  This will return the IP address of the specified host. To get your IP, just put in the hostname for your workstation.

Here is an example program:

#include <stdio.h>
#include <winsock.h>

void main()
{
// First, initialize the WINSOCK interface
WORD wVersionRequested;
WSADATA wsaData;
int err;
HOSTENT *hostent;
IN_ADDR in_addr;

wVersionRequested = MAKEWORD( 2, 0 );
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
/* Tell the user that we could not find a usable */
/* WinSock DLL. */
printf("ERROR: Failed to initialize WINSOCK");
return;
}


// Do a DNS lookup of an IP from it's hostname
hostent = gethostbyname("www.yahoo.com");
if(hostent != NULL){
memcpy(&in_addr, hostent->h_addr_list[0], 4);
printf("www.yahoo.com = %s\n", inet_ntoa(in_addr));
}
else{
printf("Error, lookup failed\n");
}
}  
 

0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article will show you some of the more useful Standard Template Library (STL) algorithms through the use of working examples.  You will learn about how these algorithms fit into the STL architecture, how they work with STL containers, and why t…
Basic understanding on "OO- Object Orientation" is needed for designing a logical solution to solve a problem. Basic OOAD is a prerequisite for a coder to ensure that they follow the basic design of OO. This would help developers to understand the b…
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.

911 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

25 Experts available now in Live!

Get 1:1 Help Now