获取mac地址

导入系统框架：

#import <ifaddrs.h>

#import <arpa/inet.h>

#include <sys/socket.h>

#include <sys/sysctl.h>

#include <net/if.h>

#include <net/if_dl.h>

代码：

//ip

- (NSString *)getIPAddress {

    NSString *address = @"error";

    struct ifaddrs *interfaces = NULL;

    struct ifaddrs *temp_addr = NULL;

    int success = 0;

    // retrieve the current interfaces - returns 0 on success

    success = getifaddrs(&interfaces);

    if (success == 0) {

        // Loop through linked list of interfaces

        temp_addr = interfaces;

        while(temp_addr != NULL) {

            if(temp_addr->ifa_addr->sa_family == AF_INET) {

                // Check if interface is en0 which is the wifi connection on the iPhone

                if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {

                    // Get NSString from C String

                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];

                }

            }

            temp_addr = temp_addr->ifa_next;

        }

    }

    // Free memory

    freeifaddrs(interfaces);

    return address;

}

//MAC

- (NSString *)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;

    }

    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];

}