IP Enumeration

WEBINAR: On-demand webcast

How to Boost Database Development Productivity on Linux, Docker, and Kubernetes with Microsoft SQL Server 2017 REGISTER >

.

Environment: VC4, VC5, VC6

I think this is the quickest way to enumerate the available IP addresses on your machine. I've gotten this question a lot. This is fairly simple but haven't seen it anywhere.

IP Enumeration

// Function GetIPs
// in : CStringArray
// out : CStringArray + count

int GetIPs( CStringArray &arrIPS )
{
    BOOL bRet = TRUE;
    char name[255];
    int i=0;
    PHOSTENT hostinfo;

  //first, clear the list
    arrIPS.RemoveAll();

  //get the host name
  if( gethostname ( name, sizeof(name)) == 0)
  {
    // get the host info
    if((hostinfo = gethostbyname(name)) != NULL)
    {
      // now, loop until the address list = null
      while( hostinfo->h_addr_list[i] != NULL )
      {
        //get the IP address
        char *ip_addr = inet_ntoa (*(struct in_addr *)
                        hostinfo->h_addr_list[i]);
        //add it to the array
        ip_addr );
        //increment the counter
        i++;
      }
    }
  }
  //return the array count
  return arrIPS.GetSize();
}


Comments

  • Don't forget to call WSAStart()...

    Posted by Legacy on 12/30/2003 12:00am

    Originally posted by: David Little

    This fails if you don't call WSAStart() first.  And the missing code is:
    
    


    arrIPS.Add(CString(ip_addr)); // the CString constructor is probably unnecessary


    Reply
  • GOOD BOY

    Posted by Legacy on 12/24/2003 12:00am

    Originally posted by: Best Programmer

    YES THIS IS THE QUICKEST WAY.....YOU GET THE AWARD FOR THE QUICKY OF THE YEAR

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • As all sorts of data becomes available for storage, analysis and retrieval - so called 'Big Data' - there are potentially huge benefits, but equally huge challenges...
  • The agile organization needs knowledge to act on, quickly and effectively. Though many organizations are clamouring for "Big Data", not nearly as many know what to do with it...
  • Cloud-based integration solutions can be confusing. Adding to the confusion are the multiple ways IT departments can deliver such integration...

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date