擷取iOS裝置當前ip地址

第一種方法是用系統api的方式擷取，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"#definemin(a,b)((a) < (b) ? (a) : (b))#definemax(a,b)((a) > (b) ? (a) : (b))#define BUFFERSIZE4000char *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 bufferif (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]];}

這樣得到的ip，如果在內網中，那麼就是內網的ip.

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。

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