獲取iOS設備當前ip地址

第一種方法是用系統api的方式獲取，如下

1. #include <stdio.h>
2. #include <stdlib.h>
3. #include <string.h>
4. #include <unistd.h>
5. #include <sys/ioctl.h>
6. #include <sys/types.h>
7. #include <sys/socket.h>
8. #include <netinet/in.h>
9. #include <netdb.h>
10. #include <arpa/inet.h>
11. #include <sys/sockio.h>
12. #include <net/if.h>
13. #include <errno.h>
14. #include <net/if_dl.h>
16. //#include "GetAddresses.h"
18. #define min(a,b) ((a) < (b) ? (a) : (b))
19. #define max(a,b) ((a) > (b) ? (a) : (b))
21. #define BUFFERSIZE 4000
23. char *if_names[MAXADDRS];
24. char *ip_names[MAXADDRS];
25. char *hw_addrs[MAXADDRS];
26. unsigned long ip_addrs[MAXADDRS];
28. static int nextAddr = 0;
30. void InitAddresses()
31. {
32. int i;
33. for (i=0; i<MAXADDRS; ++i)
34. {
35. if_names[i] = ip_names[i] = hw_addrs[i] = NULL;
36. ip_addrs[i] = 0;
37. }
38. }
40. void FreeAddresses()
41. {
42. int i;
43. for (i=0; i<MAXADDRS; ++i)
44. {
45. if (if_names[i] != 0) free(if_names[i]);
46. if (ip_names[i] != 0) free(ip_names[i]);
47. if (hw_addrs[i] != 0) free(hw_addrs[i]);
48. ip_addrs[i] = 0;
49. }
50. InitAddresses();
51. }
53. void GetIPAddresses()
54. {
55. int i, len, flags;
56. char buffer[BUFFERSIZE], *ptr, lastname[IFNAMSIZ], *cptr;
57. struct ifconf ifc;
58. struct ifreq *ifr, ifrcopy;
59. struct sockaddr_in *sin;
61. char temp[80];
63. int sockfd;
65. for (i=0; i<MAXADDRS; ++i)
66. {
67. if_names[i] = ip_names[i] = NULL;
68. ip_addrs[i] = 0;
69. }
71. sockfd = socket(AF_INET, SOCK_DGRAM, 0);
72. if (sockfd < 0)
73. {
74. perror("socket failed");
75. return;
76. }
78. ifc.ifc_len = BUFFERSIZE;
79. ifc.ifc_buf = buffer;
81. if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0)
82. {
83. perror("ioctl error");
84. return;
85. }
87. lastname[0] = 0;
89. for (ptr = buffer; ptr < buffer + ifc.ifc_len; )
90. {
91. ifr = (struct ifreq *)ptr;
92. len = max(sizeof(struct sockaddr), ifr->ifr_addr.sa_len);
93. ptr += sizeof(ifr->ifr_name) + len; // for next one in buffer
95. if (ifr->ifr_addr.sa_family != AF_INET)
96. {
97. continue; // ignore if not desired address family
98. }
100. if ((cptr = (char *)strchr(ifr->ifr_name, ':')) != NULL)
101. {
102. *cptr = 0; // replace colon will null
103. }
105. if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0)
106. {
107. continue; /* already processed this interface */
108. }
110. memcpy(lastname, ifr->ifr_name, IFNAMSIZ);
112. ifrcopy = *ifr;
113. ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy);
114. flags = ifrcopy.ifr_flags;
115. if ((flags & IFF_UP) == 0)
116. {
117. continue; // ignore if interface not up
118. }
120. if_names[nextAddr] = (char *)malloc(strlen(ifr->ifr_name)+1);
121. if (if_names[nextAddr] == NULL)
122. {
123. return;
124. }
125. strcpy(if_names[nextAddr], ifr->ifr_name);
127. sin = (struct sockaddr_in *)&ifr->ifr_addr;
128. strcpy(temp, inet_ntoa(sin->sin_addr));
130. ip_names[nextAddr] = (char *)malloc(strlen(temp)+1);
131. if (ip_names[nextAddr] == NULL)
132. {
133. return;
134. }
135. strcpy(ip_names[nextAddr], temp);
137. ip_addrs[nextAddr] = sin->sin_addr.s_addr;
139. ++nextAddr;
140. }
142. close(sockfd);
143. }
145. void GetHWAddresses()
146. {
147. struct ifconf ifc;
148. struct ifreq *ifr;
149. int i, sockfd;
150. char buffer[BUFFERSIZE], *cp, *cplim;
151. char temp[80];
153. for (i=0; i<MAXADDRS; ++i)
154. {
155. hw_addrs[i] = NULL;
156. }
158. sockfd = socket(AF_INET, SOCK_DGRAM, 0);
159. if (sockfd < 0)
160. {
161. perror("socket failed");
162. return;
163. }
165. ifc.ifc_len = BUFFERSIZE;
166. ifc.ifc_buf = buffer;
168. if (ioctl(sockfd, SIOCGIFCONF, (char *)&ifc) < 0)
169. {
170. perror("ioctl error");
171. close(sockfd);
172. return;
173. }
175. ifr = ifc.ifc_req;
177. cplim = buffer + ifc.ifc_len;
179. for (cp=buffer; cp < cplim; )
180. {
181. ifr = (struct ifreq *)cp;
182. if (ifr->ifr_addr.sa_family == AF_LINK)
183. {
184. struct sockaddr_dl *sdl = (struct sockaddr_dl *)&ifr->ifr_addr;
185. int a,b,c,d,e,f;
186. int i;
188. strcpy(temp, (char *)ether_ntoa(LLADDR(sdl)));
189. sscanf(temp, "%x:%x:%x:%x:%x:%x", &a, &b, &c, &d, &e, &f);
190. sprintf(temp, "%02X:%02X:%02X:%02X:%02X:%02X",a,b,c,d,e,f);
192. for (i=0; i<MAXADDRS; ++i)
193. {
194. if ((if_names[i] != NULL) && (strcmp(ifr->ifr_name, if_names[i]) == 0))
195. {
196. if (hw_addrs[i] == NULL)
197. {
198. hw_addrs[i] = (char *)malloc(strlen(temp)+1);
199. strcpy(hw_addrs[i], temp);
200. break;
201. }
202. }
203. }
204. }
205. cp += sizeof(ifr->ifr_name) + max(sizeof(ifr->ifr_addr), ifr->ifr_addr.sa_len);
206. }
208. close(sockfd);
209. }

1. - (NSString *)deviceIPAdress {
2. InitAddresses();
3. GetIPAddresses();
4. GetHWAddresses();
6. return [NSString stringWithFormat:@"%s", ip_names[1]];
7. }

第二種方法是可以獲取公網ip

1. - (void)getCurrentIP
2. {
3. NSURL *url = [NSURL URLWithString:@"http://automation.whatismyip.com/n09230945.asp"];
4. __block ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
5. [request setCompletionBlock:^{
6. NSString *responseString = [request responseString];
7. if (responseString) {
9. NSString *ip = [NSString stringWithFormat:@"%@", responseString];
11. NSLog(@"responseString = %@", ip);
12. };
14. }];
16. [request setFailedBlock:^{
17. }];
18. }