注意,是iOS7以下的设备,直接上源码,获取mac地址都是为了唯一标识一个设备的,但iOS7设备的mac地址为 020000000000

MacAddress.h

#include <sys/socket.h> 
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_dl.h>

NSString *  macaddress();

MacAddress.m

#import "MacAddress.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 error/n");
        return NULL;
    }
    
    if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
    {
        printf("Error: sysctl, take 1/n");
        return NULL;
    }
    
    if ((buf = 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)];
    
    free(buf);
    
    return [outstring uppercaseString];
}

测试: