有时候我们会碰到一种需求，去手机用户的IP 地址，下面直接上.m文件代码：

#import "NSObject+DNKGetIPAddress.h"
#import <sys/socket.h>
#import <sys/sockio.h>
#import <sys/ioctl.h>
#import <net/if.h>
#import <arpa/inet.h>

@implementation NSObject (DNKGetIPAddress)

+ (NSString *)getDeviceIPIpAddresses
{
    int sockfd =socket(AF_INET,SOCK_DGRAM, 0);
    
    //    if (sockfd <</span> 0) return nil;
    
    NSMutableArray *ips = [NSMutableArray array];
    
    int BUFFERSIZE =4096;
    
    struct ifconf ifc;
    
    char buffer[BUFFERSIZE], *ptr, lastname[IFNAMSIZ], *cptr;
    
    struct ifreq *ifr, ifrcopy;
    
    ifc.ifc_len = BUFFERSIZE;
    
    ifc.ifc_buf = buffer;
    
    if (ioctl(sockfd,SIOCGIFCONF, &ifc) >= 0){
        
        for (ptr = buffer; ptr < buffer + ifc.ifc_len; ){
            ifr = (struct ifreq *)ptr;
            int len =sizeof(struct sockaddr);
            if (ifr->ifr_addr.sa_len > len) {
                
                len = ifr->ifr_addr.sa_len;
                
            }
            ptr += sizeof(ifr->ifr_name) + len;
            
            if (ifr->ifr_addr.sa_family !=AF_INET) continue;
            
            if ((cptr = (char *)strchr(ifr->ifr_name,':')) != NULL) *cptr =0;
            
            if (strncmp(lastname, ifr->ifr_name,IFNAMSIZ) == 0)continue;
            
            memcpy(lastname, ifr->ifr_name,IFNAMSIZ);
            
            ifrcopy = *ifr;
            
            ioctl(sockfd,SIOCGIFFLAGS, &ifrcopy);
            
            if ((ifrcopy.ifr_flags &IFF_UP) == 0)continue;
            
            NSString *ip = [NSString stringWithFormat:@"%s",inet_ntoa(((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr)];
            
            [ips addObject:ip];
            
        }
        
    }
    close(sockfd);
    NSString *deviceIP =@"";
    
    for (int i=0; i < ips.count; i++)
    {
        if (ips.count >0)
            
        {
            deviceIP = [NSString stringWithFormat:@"%@",ips.lastObject];
        }
    }
    return deviceIP;

}

@end