第一種方法是用系統api的方式獲取,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;
- }
- }
- }
- }
- 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.
第二種方法是可以獲取公網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這個網絡開源庫。 獲取你當前的ip地址。