How to get the ip address under Windows

Question

all i already had a "socketfd", and i was wondering how to use it to retrieve the local ip address. under linux, i can do something like this(not exactly correct):

struct ifreq ifr;
ifr.ifr_addr.sa_family = AF_INET;
ioctl(socketfd, SIOCGIFADDR, &ifr);
char *address = inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr);

but, on Windows, how can i achieve the same goal? (not using MFC) many thanks.

edit: maybe my host has multiple ip addresses, and i want the one "connected" with "socketfd".

score 1 · Answer 1 · answered Feb 25 '11 at 06:32

1

WORD wVersionRequested;
      WSADATA wsaData;
      char name[255];
      CString ip;
      PHOSTENT hostinfo;
      wVersionRequested = MAKEWORD( 2, 0 );

      if ( WSAStartup( wVersionRequested, &wsaData ) == 0 )
      {

            if( gethostname ( name, sizeof(name)) == 0)
            {
                  if((hostinfo = gethostbyname(name)) != NULL)
                  {
                        ip = inet_ntoa (*(struct in_addr *)*hostinfo->h_addr_list);
                  }
            }

            WSACleanup( );
      }

with #include <winsock2.h>

answered Feb 25 '11 at 06:32

Sergey Vedernikov

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my host has several ip addresses , and i want the one "connected" with "socketfd",so... – Heisenburgor Feb 25 '11 at 06:38
I tried this code and getting the following errors ... `error: unknown type name 'CString'` Full error and code here... https://pastebin.com/shcZG73E – Mar 11 '18 at 01:50

score 1 · Accepted Answer · answered Feb 25 '11 at 07:38

1

If the socket is connected, then getsockname() on it will fill a struct sockaddr with the local name for the socket. This works on both OSes (and anything with BSD sockets).

answered Feb 25 '11 at 07:38

caf

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How to get the ip address under Windows

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