如何样能获取ipad的mac地址

怎么样能获取ipad的mac地址?
怎么样能获取ipad的mac地址?

------解决方案--------------------
#import <sys/socket.h> // Per msqr 
#import <sys/sysctl.h> 
#import <net/if.h> 
#import <net/if_dl.h>

#include <arpa/inet.h>
#include <netdb.h>

#include <net/if.h>

#include <ifaddrs.h>
#import <dlfcn.h>

+(NSString *) macaddress 
{ 
int mib[6]; 
size_t len; 
char *buf; 
unsigned char *ptr; 
struct if_msghdr *ifm; 
struct sockaddr_dl *sdl; 

mib[0] = CTL_NET; 
mib[1] = AF_ROUTE; 
mib[2] = 0; 
mib[3] = AF_LINK; 
mib[4] = NET_RT_IFLIST; 

if ((mib[5] = if_nametoindex("en0")) == 0) { 
printf("Error: if_nametoindex errorn"); 
return NULL; 
} 

if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) { 
printf("Error: sysctl, take 1n"); 
return NULL; 
} 

if ((buf = (char *)malloc(len)) == NULL) { 
printf("Could not allocate memory. error!n"); 
return NULL; 
} 

if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) { 
printf("Error: sysctl, take 2"); 
return NULL; 
} 

ifm = (struct if_msghdr *)buf; 
sdl = (struct sockaddr_dl *)(ifm + 1); 
ptr = (unsigned char *)LLADDR(sdl); 
NSString *outstring = [NSString stringWithFormat:@"%02x-%02x-%02x-%02x-%02x-%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)]; 
// NSString *outstring = [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)]; 
// NSString *outstring = [NSString stringWithFormat:@"11-22-37-44-65-77"]; 
free(buf); 
return [outstring uppercaseString]; 
}