IP Enumeration

.

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  • Your email address will not be published.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

  • On-demand Event Event Date: August 27, 2015 With the cloud enabling companies to spin up servers and stand up data stores more quickly, mobile apps can be created faster, reducing the time-to-value. But three major obstacles stand in the way for many organizations: The backlog of app project requests confronting every enterprise regardless of their internal app development capabilities Finding and employing better, faster tools to speed and simplify the process of developing those apps. The emergence of …

  • When individual departments procure cloud service for their own use, they usually don't consider the hazardous organization-wide implications. Read this paper to learn best practices for setting up an internal, IT-based cloud brokerage function that service the entire organization. Find out how this approach enables you to retain top-down visibility and control of network security and manage the impact of cloud traffic on your WAN.

Most Popular Programming Stories

More for Developers

RSS Feeds

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