Obtains the IP address of the specified Nic.

# Include <stdio. h>

# Include <stdlib. h>

# Include <error. h>

# Include <string. h>

# Include <netdb. h>

# Include <sys/types. h>

# Include <netinet/in. h>

# Include <sys/socket. h>

# Include <unistd. h>

# Include <sys/IOCTL. h>

# Include <ARPA/inet. h>

# Include <net/if_arp.h>

# Include <net/If. h>

# Include <ARPA/inet. h>

# Include "string"

Using namespace STD;

Int getlocaip (const char * Eth, unsigned & IP)

{

Int sockfd;

If (-1 = (sockfd = socket (pf_inet, sock_stream, 0 )))

{

Perror ("socket ");

Return-1;

}

Struct ifreq req;

Bzero (& req, sizeof (struct ifreq ));

Strcpy (req. ifr_name, ETH );

If (IOCTL (sockfd, siocgifaddr, & req) <0)

{

Fprintf (stderr, "IOCTL failed. \ n ");

Return-1;

}

Struct sockaddr_in * Host;

Host = (struct sockaddr_in *) & Req. ifr_addr;

IP = (unsigned) Host-> sin_addr.s_addr;

Close (sockfd );

Return 0;

}

Int main (INT argc, char ** argv)

{

Unsigned IP address;

String str_ip = "eth0 ";

Unsigned ret = getlocaip (str_ip.c_str (), ip );

If (ret = 0)

{

Char c_ip [16];

Memset (c_ip, 0, 16 );

Inet_ntop (af_inet, & IP, c_ip, 16 );

Printf ("loca_ip: % s \ n", c_ip );

}

Return 0;

}

Original

Http://blog.chinaunix.net/uid-26707720-id-3297624.html

Http://wenku.baidu.com/view/59f4508d680203d8ce2f2412.html ###