得到iphone的IP地址源码

定义了几个方法，获取iphone的IP地址。

IPAdress.h

#define MAXADDRS32extern char *if_names[MAXADDRS];extern char *ip_names[MAXADDRS];extern char *hw_addrs[MAXADDRS];extern unsigned long ip_addrs[MAXADDRS];// Function prototypesvoid InitAddresses();void FreeAddresses();void GetIPAddresses();void GetHWAddresses(); 

IPAddress.c

#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);} 

 

如何用呢， 我们在MyAppAppDelegate.h中如下

#import <UIKit/UIKit.h>@interface MyAppAppDelegate : NSObject <UIApplicationDelegate> {NSString *localIP;}@property (nonatomic, retain) NSString *localIP;- (NSString *)deviceIPAdress;@end 

 

MyAppDelegate.m

- (void)applicationDidFinishLaunching:(UIApplication *)application {self.localIP = [self deviceIPAdress]; ...}- (NSString *)deviceIPAdress {InitAddresses();GetIPAddresses();GetHWAddresses(); /* int i;NSString *deviceIP;for (i=0; i<MAXADDRS; ++i){static unsigned long localHost = 0x7F000001;// 127.0.0.1unsigned long theAddr;theAddr = ip_addrs[i];if (theAddr == 0) break;if (theAddr == localHost) continue;NSLog(@"%s %s %s/n", if_names[i], hw_addrs[i], ip_names[i]);}deviceIP = [NSString stringWithFormat:@"%s", ip_names[i]];*/ //this will get you the right IP from your device in format like 198.111.222.444. If you use the for loop above you will se that ip_names array will also contain localhost IP 127.0.0.1 that's why I don't use it. Eventualy this was code from mac that's why it uses arrays for ip_names as macs can have multiple IPsreturn [NSString stringWithFormat:@"%s", ip_names[1]];}