How to Get Your Own IP Address Programmatically

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The following function shows how to obtain your machine's host name (IP address or domain name) programmatically, using the Windows Sockets APIs, and use it for initializing the server side.

CString GetDefaultConnection()
{
   CString s;
   WSADATA wsaData;
   int iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
   if (iResult == NO_ERROR)
   {
      char     Hostname[100];

      if(gethostname( Hostname, sizeof( Hostname )) != SOCKET_ERROR)
      {
         HOSTENT* pHostEnt = gethostbyname( Hostname );
         if(pHostEnt)
         {
            if(pHostEnt->h_addr_list[0])
            {
               s.Format("%d.%d.%d.%d",
               (int) (BYTE) pHostEnt->h_addr_list[0][0],
               (int) (BYTE) pHostEnt->h_addr_list[0][1],
               (int) (BYTE) pHostEnt->h_addr_list[0][2],
              (int) (BYTE) pHostEnt->h_addr_list[0][3]);
            }
         }
      }
      WSACleanup();
   }

   return s;
}

If there are multiple names (IP addresses), you can force any one you want.