获取IOS设备的MAC地址

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

#pragma mark MAC
// Return the local MAC addy
// Courtesy of FreeBSD hackers email list
// Accidentally munged during previous update. Fixed thanks to mlamb.
CCString *getMacAddress()
{
	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;
	}
    
	buf = (char *)malloc(len);
	if (buf== 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)];
    CCString *str=CCString::createWithFormat("%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)];
    
	free(buf);
    
	//return [outstring uppercaseString];
    return str;
}