获取iOS设备当前ip地址 .

本文转自：http://blog.csdn.net/favormm/article/details/6858330

 

第一种方法是用系统api的方式获取，如下:

#include <stdio.h>  

 #include <stdlib.h>   

#include <string.h>   

#include <unistd.h>   

#include <sys/ioctl.h>   

#include <sys/types.h>   

#include <sys/socket.h>   

#include <netinet/in.h>   

#include <netdb.h>   

#include <arpa/inet.h>   

#include <sys/sockio.h>   

#include <net/if.h>   

#include <errno.h>   

#include <net/if_dl.h>   


//#include "GetAddresses.h"   


 

#define min(a,b)    ((a) < (b) ? (a) : (b))   

#define max(a,b)    ((a) > (b) ? (a) : (b))   

  

#define BUFFERSIZE  4000   

  

char *if_names[MAXADDRS];  

char *ip_names[MAXADDRS];  

char *hw_addrs[MAXADDRS];  

unsigned long ip_addrs[MAXADDRS];  

  

static int   nextAddr = 0;  

  

void InitAddresses()  

{  

    int i;  

    for (i=0; i<MAXADDRS; ++i)  

    {  

        if_names[i] = ip_names[i] = hw_addrs[i] = NULL;  

        ip_addrs[i] = 0;  

    }  

}  

  

void FreeAddresses()  {  

int i;  

    for (i=0; i<MAXADDRS; ++i)  

    {  

        if (if_names[i] != 0) free(if_names[i]);  

        if (ip_names[i] != 0) free(ip_names[i]);  

        if (hw_addrs[i] != 0) free(hw_addrs[i]);  

        ip_addrs[i] = 0;  

    }  

    InitAddresses();  

}  

  

void GetIPAddresses()  

{  

    int                 i, len, flags;  

    char                buffer[BUFFERSIZE], *ptr, lastname[IFNAMSIZ], *cptr;  

    struct ifconf       ifc;  

    struct ifreq        *ifr, ifrcopy;  

    struct sockaddr_in  *sin;  


    char temp[80];   

    int sockfd;  

   

    for (i=0; i<MAXADDRS; ++i)  

    {  

        if_names[i] = ip_names[i] = NULL;  

        ip_addrs[i] = 0;  

    }        

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);  

    if (sockfd < 0)  

    {  

        perror("socket failed");  

        return;  

    }      

    ifc.ifc_len = BUFFERSIZE;  

    ifc.ifc_buf = buffer;      

    if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0)  

    {  

        perror("ioctl error");  

        return;  

    }        

    lastname[0] = 0;  

      

    for (ptr = buffer; ptr < buffer + ifc.ifc_len; )  

    {  

        ifr = (struct ifreq *)ptr;  

        len = max(sizeof(struct sockaddr), ifr->ifr_addr.sa_len);  

        ptr += sizeof(ifr->ifr_name) + len;  // for next one in buffer   

          

        if (ifr->ifr_addr.sa_family != AF_INET)  

        {  

            continue;   // ignore if not desired address family   

        }  

          

        if ((cptr = (char *)strchr(ifr->ifr_name, ':')) != NULL)  

        {  

            *cptr = 0;      // replace colon will null   

        }  

          

        if (strncmp(lastname, ifr->ifr_name, IFNAMSIZ) == 0)  

        {  

            continue;   /* already processed this interface */  

        }  

          

        memcpy(lastname, ifr->ifr_name, IFNAMSIZ);  

          

        ifrcopy = *ifr;  

        ioctl(sockfd, SIOCGIFFLAGS, &ifrcopy);  

        flags = ifrcopy.ifr_flags;  

        if ((flags & IFF_UP) == 0)  

        {  

            continue;   // ignore if interface not up   

        }  

          

        if_names[nextAddr] = (char *)malloc(strlen(ifr->ifr_name)+1);  

        if (if_names[nextAddr] == NULL)  

        {  

            return;  

        }  

        strcpy(if_names[nextAddr], ifr->ifr_name);  

          

        sin = (struct sockaddr_in *)&ifr->ifr_addr;  

        strcpy(temp, inet_ntoa(sin->sin_addr));  

          

        ip_names[nextAddr] = (char *)malloc(strlen(temp)+1);  

        if (ip_names[nextAddr] == NULL)  

        {  

            return;  

        }  

        strcpy(ip_names[nextAddr], temp);            

        ip_addrs[nextAddr] = sin->sin_addr.s_addr;  

        ++nextAddr;  

    }     

    close(sockfd);  

}  

  

void GetHWAddresses()  

{  

    struct ifconf ifc;  

    struct ifreq *ifr;  

    int i, sockfd;  

    char buffer[BUFFERSIZE], *cp, *cplim;  

    char temp[80];    

    for (i=0; i<MAXADDRS; ++i)  

    {  

        hw_addrs[i] = NULL;  

    }       

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);  

    if (sockfd < 0)  

    {  

        perror("socket failed");  

        return;  

    }      

    ifc.ifc_len = BUFFERSIZE;  

    ifc.ifc_buf = buffer;     

    if (ioctl(sockfd, SIOCGIFCONF, (char *)&ifc) < 0)  

    {  

        perror("ioctl error");  

        close(sockfd);  

        return;  

    }    

    ifr = ifc.ifc_req;      

    cplim = buffer + ifc.ifc_len;  

    for (cp=buffer; cp < cplim; )  

    {  

        ifr = (struct ifreq *)cp;  

        if (ifr->ifr_addr.sa_family == AF_LINK)  

        {  

            struct sockaddr_dl *sdl = (struct sockaddr_dl *)&ifr->ifr_addr;  

            int a,b,c,d,e,f;  

            int i;         

            strcpy(temp, (char *)ether_ntoa(LLADDR(sdl)));  

            sscanf(temp, "%x:%x:%x:%x:%x:%x", &a, &b, &c, &d, &e, &f);  

            sprintf(temp, "%02X:%02X:%02X:%02X:%02X:%02X",a,b,c,d,e,f);  


            for (i=0; i<MAXADDRS; ++i)  

            {  

                if ((if_names[i] != NULL) && (strcmp(ifr->ifr_name, if_names[i]) == 0))  

                {  

                    if (hw_addrs[i] == NULL)  

                    {  

                        hw_addrs[i] = (char *)malloc(strlen(temp)+1);  

                        strcpy(hw_addrs[i], temp);  

                        break;  

                    }  

                }  

            }  

        }  

        cp += sizeof(ifr->ifr_name) + max(sizeof(ifr->ifr_addr), ifr->ifr_addr.sa_len);  

    }  


    close(sockfd);  

}  
 
 

 

 

这样得到的ip，如果在内网中，那么就是内网的ip：

- (NSString *)deviceIPAdress {  

    InitAddresses();  

    GetIPAddresses();  

   GetHWAddresses();  

    return [NSString stringWithFormat:@"%s", ip_names[1]];  

}  

 

 

第二种方法是可以获取公网ip：

 

- (void)getCurrentIP  
{  
    NSURL *url = [NSURL URLWithString:@"http://automation.whatismyip.com/n09230945.asp"];  
    __block ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];  
    [request setCompletionBlock:^{  
        NSString *responseString = [request responseString];  
        if (responseString) {  
              
            NSString *ip = [NSString stringWithFormat:@"%@", responseString];  
             
            NSLog(@"responseString = %@", ip);  
        };  
          
    }];  
      
    [request setFailedBlock:^{  
    }];  
}

 

 

评论

1 楼 aolan1108 2012-04-05