获取mac地址

#include<sys/socket.h>//Permsqr

#include<sys/sysctl.h>

#include<net/if.h>

#include<net/if_dl.h>

#pragmamarkMAC

//ReturnthelocalMACaddy

//CourtesyofFreeBSDhackersemaillist

//Accidentallymungedduringpreviousupdate.Fixedthankstomlamb.

-(NSString*)macaddress

{

intmib[6];

size_tlen;

char*buf;

unsignedchar*ptr;

structif_msghdr*ifm;

structsockaddr_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_nametoindexerror/n");

returnNULL;

}

if(sysctl(mib,6,NULL,&len,NULL,0)<0){

printf("Error:sysctl,take1/n");

returnNULL;

}

if((buf=malloc(len))==NULL){

printf("Couldnotallocatememory.error!/n");

returnNULL;

}

if(sysctl(mib,6,buf,&len,NULL,0)<0){

printf("Error:sysctl,take2");

returnNULL;

}

ifm=(structif_msghdr*)buf;

sdl=(structsockaddr_dl*)(ifm+1);

ptr=(unsignedchar*)LLADDR(sdl);

//NSString*outstring=[NSStringstringWithFormat:@"%02x:%02x:%02x:%02x:%02x:%02x",*ptr,*(ptr+1),*(ptr+2),*(ptr+3),*(ptr+4),*(ptr+5)];

NSString*outstring=[NSStringstringWithFormat:@"%02x%02x%02x%02x%02x%02x",*ptr,*(ptr+1),*(ptr+2),*(ptr+3),*(ptr+4),*(ptr+5)];

free(buf);

return[outstringuppercaseString];

}