私有方法：

NSHost* myhost =[NSHost currentHost];
NSString *ad = [myhost address];

 

As far as I know there is only one hacky way to do that. You basically open a socket and get its address using POSIX functions. Here is the code I used for this:

/*
 *  IPAdress.h
 *
 *
 */ 
 
#define MAXADDRS     32 
 
extern char * if_names [ MAXADDRS ] ;
extern char * ip_names [ MAXADDRS ] ;
extern char * hw_addrs [ MAXADDRS ] ;
extern unsigned long ip_addrs [ MAXADDRS ] ;
 
// Function prototypes 
 
void InitAddresses () ;
void FreeAddresses () ;
void GetIPAddresses () ;
void GetHWAddresses () ;
 
 
/*
 *  IPAddress.c
 *
 */ 
 
#include " IPAddress.h " 
 
#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 > 
  
#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 ) ;
}

 

 

Test:

#import " IPAdress.h " 
..........
- ( NSString * ) deviceIPAdress { 
     InitAddresses () ;
     GetIPAddresses () ;
     GetHWAddresses () ;
     return [ NSString stringWithFormat :@ " %s " , ip_names [ 1 ]] ;
} 
 
- ( void ) viewDidLoad { 
     [ super viewDidLoad ] ;
 
     NSString * ip_iphone = [ self deviceIPAdress ] ;
   NSLog ( @ " ip:%@ " , ip_iphone ) ;
}

Implicit
declaration of function 'ether_ntoa' is invalid in C99

转自：http://blog.csdn.net/toddfox/article/details/5619890