第一種方法是用系統api的方式獲取，如下

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <errno.h>
#include <net/if_dl.h>

//#include "GetAddresses.h"

#define min(a,b) ((a) < (b) ? (a) : (b))
#define max(a,b) ((a) > (b) ? (a) : (b))

#define BUFFERSIZE 4000

char *if_names[MAXADDRS];
char *ip_names[MAXADDRS];
char *hw_addrs[MAXADDRS];
unsigned long ip_addrs[MAXADDRS];

static int nextAddr = 0;

void InitAddresses()
{
int i;
for (i=0; i<MAXADDRS; ++i)
{
if_names[i] = ip_names[i] = hw_addrs[i] = NULL;
ip_addrs[i] = 0;
}
}

void FreeAddresses()
{
int i;
for (i=0; i<MAXADDRS; ++i)
{
if (if_names[i] != 0) free(if_names[i]);
if (ip_names[i] != 0) free(ip_names[i]);
if (hw_addrs[i] != 0) free(hw_addrs[i]);
ip_addrs[i] = 0;
}
InitAddresses();
}

void GetIPAddresses()
{
int i, len, flags;
char buffer[BUFFERSIZE], *ptr, lastname[IFNAMSIZ], *cptr;
struct ifconf ifc;
struct ifreq *ifr, ifrcopy;
struct sockaddr_in *sin;

char temp[80];

int sockfd;

for (i=0; i<MAXADDRS; ++i)
{
if_names[i] = ip_names[i] = NULL;
ip_addrs[i] = 0;
}

sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0)
{
perror("socket failed");
return;
}

ifc.ifc_len = BUFFERSIZE;
ifc.ifc_buf = buffer;

if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0)
{
perror("ioctl error");
return;
}

lastname[0] = 0;

for (ptr = buffer; ptr < buffer + ifc.ifc_len; )
{
ifr = (struct ifreq *)ptr;
len = max(sizeof(struct sockaddr), ifr->ifr_addr.sa_len);
ptr += sizeof(ifr->ifr_name) + len; // for next one in buffer

if (ifr->ifr_addr.sa_family != AF_INET)
{
continue; // ignore if not desired address family
}

if ((cptr = (char *)strchr(ifr->ifr_name, ':')) != NULL)
{
*cptr = 0; // replace colon will null
}

if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0)
{
continue; /* already processed this interface */
}

memcpy(lastname, ifr->ifr_name, IFNAMSIZ);

ifrcopy = *ifr;
ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy);
flags = ifrcopy.ifr_flags;
if ((flags & IFF_UP) == 0)
{
continue; // ignore if interface not up
}

if_names[nextAddr] = (char *)malloc(strlen(ifr->ifr_name)+1);
if (if_names[nextAddr] == NULL)
{
return;
}
strcpy(if_names[nextAddr], ifr->ifr_name);

sin = (struct sockaddr_in *)&ifr->ifr_addr;
strcpy(temp, inet_ntoa(sin->sin_addr));

ip_names[nextAddr] = (char *)malloc(strlen(temp)+1);
if (ip_names[nextAddr] == NULL)
{
return;
}
strcpy(ip_names[nextAddr], temp);

ip_addrs[nextAddr] = sin->sin_addr.s_addr;

++nextAddr;
}

close(sockfd);
}

void GetHWAddresses()
{
struct ifconf ifc;
struct ifreq *ifr;
int i, sockfd;
char buffer[BUFFERSIZE], *cp, *cplim;
char temp[80];

for (i=0; i<MAXADDRS; ++i)
{
hw_addrs[i] = NULL;
}

sockfd = socket(AF_INET, SOCK_DGRAM, 0);
if (sockfd < 0)
{
perror("socket failed");
return;
}

ifc.ifc_len = BUFFERSIZE;
ifc.ifc_buf = buffer;

if (ioctl(sockfd, SIOCGIFCONF, (char *)&ifc) < 0)
{
perror("ioctl error");
close(sockfd);
return;
}

ifr = ifc.ifc_req;

cplim = buffer + ifc.ifc_len;

for (cp=buffer; cp < cplim; )
{
ifr = (struct ifreq *)cp;
if (ifr->ifr_addr.sa_family == AF_LINK)
{
struct sockaddr_dl *sdl = (struct sockaddr_dl *)&ifr->ifr_addr;
int a,b,c,d,e,f;
int i;

strcpy(temp, (char *)ether_ntoa(LLADDR(sdl)));
sscanf(temp, "%x:%x:%x:%x:%x:%x", &a, &b, &c, &d, &e, &f);
sprintf(temp, "%02X:%02X:%02X:%02X:%02X:%02X",a,b,c,d,e,f);

for (i=0; i<MAXADDRS; ++i)
{
if ((if_names[i] != NULL) && (strcmp(ifr->ifr_name, if_names[i]) == 0))
{
if (hw_addrs[i] == NULL)
{
hw_addrs[i] = (char *)malloc(strlen(temp)+1);
strcpy(hw_addrs[i], temp);
break;
}
}
}
}
cp += sizeof(ifr->ifr_name) + max(sizeof(ifr->ifr_addr), ifr->ifr_addr.sa_len);
}

close(sockfd);
}

調用如下：

- (NSString *)deviceIPAdress {
InitAddresses();
GetIPAddresses();
GetHWAddresses();

return [NSString stringWithFormat:@"%s", ip_names[1]];
}

這樣得到的ip，如果在內網中，那么就是內網的ip.

第二種方法是可以獲取公網ip

- (void)getCurrentIP
{
NSURL *url = [NSURL URLWithString:@"http://automation.whatismyip.com/n09230945.asp"];
__block ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setCompletionBlock:^{
NSString *responseString = [request responseString];
if (responseString) {

NSString *ip = [NSString stringWithFormat:@"%@", responseString];

NSLog(@"responseString = %@", ip);
};

}];

[request setFailedBlock:^{
}];
}

用到了ASIHTTPRequest這個網絡開源庫。

http://automation.whatismyip.com/n09230945.asp這個http url就可以獲取你當前的ip地址。

轉載于:https://www.cnblogs.com/ligun123/archive/2011/10/26/2225072.html

總結

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