很多时候我们都需要唯一来确定一台设备,苹果设备本来有个UDID号,可以实现这个目的。在iOS5.0以前,还有一个uniqueIdentifier的API用来获得这个number。不过iOS5之后,这个API废除了。
一条路不通,我们就换一条路走,于是MAC地址就成了一个不错的选择,苹果没有提供获得MAC地址的API,不过使用sysctl还是可以有点办法的,代码如下:
#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)
{
];
size_t len;
char *buf;
unsigned char *ptr;
struct if_msghdr *ifm;
struct sockaddr_dl *sdl;
mib[] = CTL_NET;
mib[] = AF_ROUTE;
mib[] = ;
mib[] = AF_LINK;
mib[] = NET_RT_IFLIST;
] = ) {
printf("Error: if_nametoindex error/n");
return ;
}
, ) < ) {
printf("Error: sysctl, take 1/n");
return ;
}
if ((buf = malloc(len)) == NULL) {
printf("Could not allocate memory. error!/n");
return ;
}
, buf, &len, ) < ) {
printf("Error: sysctl, take 2");
free(buf);
return ;
}
ifm = (struct if_msghdr *)buf;
sdl = ();
ptr = (unsigned char *)LLADDR(sdl);
);
free(buf);
}
这段代码可以良好的工作,直到iOS7的出现。不知出于什么原因,苹果对于sysctl和ioctl进行了技术处理,让MAC地址返回02:00:00:00:00:00。官方文档上这样写的“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) and ioctl(SIOCGIFCONF). Developers using the value of the MAC address should migrate toidentifiers such as -[UIDeviceidentifierForVendor].This change affects all apps running on iOS 7”