一獲取mac地址：

#include <sys/socket.h> // Per msqr  
#include <sys/sysctl.h>  
#include <net/if.h>  
#include <net/if_dl.h>  
  
- (NSString *) macaddress  
{  
int                 mib[6];  
size_t              len;  
charchar *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 charchar *)LLADDR(sdl);  
NSString *outstring = [NSString stringWithFormat:@"x:x:x:x:x:x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];  
//NSString *outstring = [NSString stringWithFormat:@"xxxxxx", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5)];  
free(buf);  
return [outstring uppercaseString];  
}  

二 ip等信息

需要加入以下頭文件

#include <arpa/inet.h>
#include <netdb.h>
#include <net/if.h>
#include <ifaddrs.h>
#import <dlfcn.h>
#import "wwanconnect.h//frome apple 你可能沒有哦
#import <SystemConfiguration/SystemConfiguration.h>

1)獲取萬維網的ip

- (NSString *) whatismyipdotcom  
{  
    NSError *error;  
    NSURL *ipURL = [NSURL URLWithString:@"http://www.whatismyip.com/automation/n09230945.asp"];  
    NSString *ip = [NSString stringWithContentsOfURL:ipURL encoding:1 error:&error];  
    return ip ? ip : [error localizedDescription];  
}  

2)獲取本地wifi的ip地址

- (NSString *) localWiFiIPAddress  
{  
   BOOL success;  
    struct ifaddrs * addrs;  
    const struct ifaddrs * cursor;  
        success = getifaddrs(&addrs) == 0;  
    if (success) {  
        cursor = addrs;  
        while (cursor != NULL) {  
            // the second test keeps from picking up the loopback address  
            if (cursor->ifa_addr->sa_family == AF_INET && (cursor->ifa_flags & IFF_LOOPBACK) == 0)   
            {  
                NSString *name = [NSString stringWithUTF8String:cursor->ifa_name];  
                if ([name isEqualToString:@"en0"])  // Wi-Fi adapter  
                    return [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)cursor->ifa_addr)->sin_addr)];  
            }  
            cursor = cursor->ifa_next;  
        }  
        freeifaddrs(addrs);  
    }  
    return nil;  
}  

3)NSString和Address轉換

+ (NSString *) stringFromAddress: (const struct sockaddr *) address  
{  
    if(address && address->sa_family == AF_INET) {  
        const struct sockaddr_in* sin = (struct sockaddr_in*) address;  
        return [NSString stringWithFormat:@"%@:%d", [NSString stringWithUTF8String:inet_ntoa(sin->sin_addr)], ntohs(sin->sin_port)];  
    }  
     
    return nil;  
}  
  
+ (BOOL)addressFromString:(NSString *)IPAddress address:(struct sockaddr_in *)address  
{  
    if (!IPAddress || ![IPAddress length]) {  
        return NO;  
    }  
     
    memset((charchar *) address, sizeof(struct sockaddr_in), 0);  
    address->sin_family = AF_INET;  
    address->sin_len = sizeof(struct sockaddr_in);  
     
    int conversionResult = inet_aton([IPAddress UTF8String], &address->sin_addr);  
    if (conversionResult == 0) {  
        NSAssert1(conversionResult != 1, @"Failed to convert the IP address string into a sockaddr_in: %@", IPAddress);  
        return NO;  
    }  
     
    return YES;  
}  

4)獲取host屬性

- (NSString *) hostname  
{  
    char baseHostName[256]; // Thanks, Gunnar Larisch  
    int success = gethostname(baseHostName, 255);  
    if (success != 0) return nil;  
    baseHostName[255] = '/0';  
     
#if TARGET_IPHONE_SIMULATOR  
     return [NSString stringWithFormat:@"%s", baseHostName];  
#else  
    return [NSString stringWithFormat:@"%s.local", baseHostName];  
#endif  
}  
從host獲取地址  
- (NSString *) getIPAddressForHost: (NSString *) theHost  
{  
    struct hostent *host = gethostbyname([theHost UTF8String]);  
    if (!host) {herror("resolv"); return NULL; }  
    struct in_addr **list = (struct in_addr **)host->h_addr_list;  
    NSString *addressString = [NSString stringWithCString:inet_ntoa(*list[0]) encoding:NSUTF8StringEncoding];  
    return addressString;  
}  
  
這是本地host的IP地址  
- (NSString *) localIPAddress  
{  
    struct hostent *host = gethostbyname([[self hostname] UTF8String]);  
    if (!host) {herror("resolv"); return nil;}  
    struct in_addr **list = (struct in_addr **)host->h_addr_list;  
    return [NSString stringWithCString:inet_ntoa(*list[0]) encoding:NSUTF8StringEncoding];  
}