iOS如何获取手机的Mac地址

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

// Return the local MAC addy 
// Courtesy of FreeBSD hackers email list 
// Accidentally munged during previous update. Fixed thanks to mlamb. 
- (NSString *) macaddress 
{ 
   
  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)]; 
   
//  NSString *outstring = [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)]; 
   
  NSLog(@"outString:%@", outstring); 
   
  free(buf); 
   
  return [outstring uppercaseString]; 
}

 - (NSString *)getMacAddress 
{ 
  int         mgmtInfoBase[6]; 
  char        *msgBuffer = NULL; 
  size_t       length; 
  unsigned char    macAddress[6]; 
  struct if_msghdr  *interfaceMsgStruct; 
  struct sockaddr_dl *socketStruct; 
  NSString      *errorFlag = NULL; 
   
  // Setup the management Information Base (mib) 
  mgmtInfoBase[0] = CTL_NET;    // Request network subsystem 
  mgmtInfoBase[1] = AF_ROUTE;    // Routing table info 
  mgmtInfoBase[2] = 0; 
  mgmtInfoBase[3] = AF_LINK;    // Request link layer information 
  mgmtInfoBase[4] = NET_RT_IFLIST; // Request all configured interfaces 
   
  // With all configured interfaces requested, get handle index 
  if ((mgmtInfoBase[5] = if_nametoindex("en0")) == 0) 
    errorFlag = @"if_nametoindex failure"; 
  else 
  { 
    // Get the size of the data available (store in len) 
    if (sysctl(mgmtInfoBase, 6, NULL, &length, NULL, 0) < 0) 
      errorFlag = @"sysctl mgmtInfoBase failure"; 
    else 
    { 
      // Alloc memory based on above call 
      if ((msgBuffer = malloc(length)) == NULL) 
        errorFlag = @"buffer allocation failure"; 
      else 
      { 
        // Get system information, store in buffer 
        if (sysctl(mgmtInfoBase, 6, msgBuffer, &length, NULL, 0) < 0) 
          errorFlag = @"sysctl msgBuffer failure"; 
      } 
    } 
  } 
   
  // Befor going any further... 
  if (errorFlag != NULL) 
  { 
    NSLog(@"Error: %@", errorFlag); 
    return errorFlag; 
  } 
   
  // Map msgbuffer to interface message structure 
  interfaceMsgStruct = (struct if_msghdr *) msgBuffer; 
   
  // Map to link-level socket structure 
  socketStruct = (struct sockaddr_dl *) (interfaceMsgStruct + 1); 
   
  // Copy link layer address data in socket structure to an array 
  memcpy(&macAddress, socketStruct->sdl_data + socketStruct->sdl_nlen, 6); 
   
  // Read from char array into a string object, into traditional Mac address format 
  NSString *macAddressString = [NSString stringWithFormat:@"%02x:%02x:%02x:%02x:%02x:%02x", 
                 macAddress[0], macAddress[1], macAddress[2], 
                 macAddress[3], macAddress[4], macAddress[5]]; 
  NSLog(@"Mac Address: %@", macAddressString); 
   
  // Release the buffer memory 
  free(msgBuffer); 
   
  return macAddressString; 
}