获取iOS设备当前ip地址

第一种方法是用系统api的方式获取，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; 

                    } 

                } www.2cto.com

            } 

        } 

        cp += sizeof(ifr->ifr_name) + max(sizeof(ifr->ifr_addr), ifr->ifr_addr.sa_len); 

    } 

     

    close(sockfd); 

} 

 

- (NSString *)deviceIPAdress { 

    InitAddresses(); 

    GetIPAddresses(); 

    GetHWAddresses(); 

 

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

} 

 

这样得到的ip，如果在内网中，那么就是内网的ip.

第二种方法是可以获取公网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这个网络开源库。

http://automation.whatismyip.com/n09230945.asp这个http url就可以获取你当前的ip地址。