壹條路不通，換壹條路走，於是MAC地址就成了壹個不錯的選擇，蘋果沒有提供獲得MAC地址的API，不過使用sysctl還是可以有點辦法的，代碼如下：
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <net/if_dl.h>
#include <sys/sysctl.h>
void GetMACAddress(unsigned char *mac)
{
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 ;
}
if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) {
printf("Error: sysctl, take 1/n");
return ;
}
if ((buf = malloc(len)) == NULL) {
printf("Could not allocate memory. error!/n");
return ;
}
if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
printf("Error: sysctl, take 2");
free(buf);
return ;
}
ifm = (struct if_msghdr *)buf;
sdl = (struct sockaddr_dl *)(ifm + 1);
ptr = (unsigned char *)LLADDR(sdl);
memcpy(mac,ptr, 6);
free(buf);
}
段代碼可以良好的工作，直到iOS7的出現。不知出於什麽原因，蘋果對於sysctl和ioctl進行了技術處理，讓MAC地址返回02:00:00:00:00:00。官方文檔上這樣寫的“Twolow-level networking APIs that used to return a MAC address now return thefixed value 02:00:00:00:00:00. The APIs in question are sysctl(NET_RT_IFLIST) andioctl(SIOCGIFCONF). Developers using the value of the MAC address should migrate toidentifiers such as -[UIDeviceidentifierForVendor].This change affects all apps running on iOS 7”