C + + Access to public IP address and intranet IP

get public IP:
BOOL Getpublicip (string& IP) {    int    sock;    char **pptr = NULL;    struct sockaddr_in    destaddr;    struct hostent    *ptr = NULL;    Char destip[128];    Sock = socket (af_inet,sock_stream,0);    if (-1 = = sock) {        perror ("creat socket Failed");        return false;    }    Bzero (void *) &destaddr,sizeof (DESTADDR));    destaddr.sin_family = af_inet;    Destaddr.sin_port = htons (n);    ptr = gethostbyname ("www.ip138.com");    if (NULL = = ptr) {        perror ("gethostbyname error");        return false;    }    for (pptr=ptr->h_addr_list; NULL! = *pptr; ++PPTR) {        inet_ntop (ptr->h_addrtype,*pptr,destip,sizeof (Destip));        printf ("addr:%s\n", Destip);        ip = destip;        return true;    }    return true;}

Get intranet IP:
int Getlocalip (char* outip) {#ifndef win32int i=0;int sockfd;struct ifconf ifconf;char buf[512];struct ifreq *ifreq;char* ip;//initialization Ifconfifconf.ifc_len = 512;ifconf.ifc_buf = buf;strcpy (Outip, "127.0.0.1"); if (SOCKFD = socket (Af_inet, Sock_ Dgram, 0)) (<0) {return-1;} IOCTL (SOCKFD, siocgifconf, &ifconf);    Get all interface information close (SOCKFD);//The next one gets the IP address ifreq = (struct ifreq*) buf;for (i= (ifconf.ifc_len/sizeof (struct ifreq)); >0; i--) {IP = Inet_ntoa ((struct sockaddr_in*) & (IFREQ->IFR_ADDR)->sin_addr), if (strcmp (IP, "127.0.0.1") ==0)  //Exclude 127.0.0.1, continue next {ifreq++;continue;}} strcpy (OUTIP,IP); return 0; #elsereturn 0; #endif}

C + + Access to public IP address and intranet IP