Several methods of acquiring the IP address of the device under Apple iOS

To get the device's IP address, a random search on the internet can find a lot of results, but these can be found in the code is basically written in C, and did not target iOS optimized adjustment, use is not convenient. Just to get the IP address, encapsulated in a function called and then used to be convenient. The code is relatively simple, that is, the online copy of the code to do the collation and iOS adaptation. function returns an array that contains the IP address of all network adapters.

The code is as follows

Copy Code

-(Nsarray *) getipaddresses { int SOCKFD = socket (af_inet, SOCK_DGRAM, 0); if (SOCKFD < 0) return nil; Nsmutablearray *ips = [Nsmutablearray array]; int buffersize = 4096; struct ifconf ifc; Char Buffer[buffersize], *ptr, Lastname[ifnamsiz], *cptr; struct Ifreq *ifr, ifrcopy; Ifc.ifc_len = buffersize; ifc.ifc_buf = buffer; if (IOCTL (SOCKFD, siocgifconf, &AMP;IFC) >= 0) { for (ptr = buffer; ptr < buffer + Ifc.ifc_len;) { IFR = (struct ifreq *) ptr; int len = sizeof (struct sockaddr); if (Ifr->ifr_addr.sa_len > Len) { Len = ifr->ifr_addr.sa_len; } PTR + + sizeof (ifr->ifr_name) + len; if (ifr->ifr_addr.sa_family!= af_inet) continue; if ((cptr = (char *) STRCHR (ifr->ifr_name, ': '))!= NULL) *cptr = 0; if (strncmp (LastName, Ifr->ifr_name, ifnamsiz) = = 0) continue; memcpy (LastName, Ifr->ifr_name, Ifnamsiz); Ifrcopy = *IFR; IOCTL (SOCKFD, Siocgifflags, &ifrcopy); if ((Ifrcopy.ifr_flags & iff_up) = = 0) continue; NSString *ip = [nsstring stringwithformat:@ '%s ', Inet_ntoa ((struct sockaddr_in *) &ifr->ifr_addr) )]; [IPs ADDOBJECT:IP]; } } Close (SOCKFD); return IPs; }

File headers need to add these import

The code is as follows	Copy Code
#import <sys/socket.h> #import <sys/sockio.h> #import <sys/ioctl.h> #import <net/if.h> #import <arpa/inet.h>

The second method is to get the public network IP

code is as follows

copy code

-(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:^{  }]; }

The

ASIHTTPRequest the Open Source library for this network.