iOS获取OpenUUID

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#pragma mark - 获取MAC地址+ (NSString *)obtainMacAddress {    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) {        free(buf);        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];}

#pragma mark - 获取设备UUID- (void)obtainDeviceOpenUUID {    if (![kUserDefaults objectForKey:kOpenUUIDKey]) {        NSString *uuid = nil;        if ([[[UIDevice currentDevice] systemVersion] floatValue] < 6.0) {            uuid = [NSString obtainMacAddress]; // 6.0以前用MAC地址作为UID        } else {            // identifierForVendor 6.0后可用            uuid = [[[UIDevice currentDevice] identifierForVendor] UUIDString];        }        [kUserDefaults setObject:uuid forKey:kOpenUUIDKey];    }    return;}

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