擷取 iOS 裝置當前 ip 地址

#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); } - (NSString *)deviceIPAdress {     InitAddresses();     GetIPAddresses();     GetHWAddresses();     return [NSString stringWithFormat:@"%s", ip_names[1]]; }

2. [代碼]第二種方法是可以擷取公網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這個網路開源庫。 擷取你當前的ip地址。