得到iPhone的IP地址函数

#include <ifaddrs.h>

#include <arpa/inet.h>

  

  

- (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:@"en1"])

                {

                    // 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;

}

//该代码片段来自于: http://www.sharejs.com/codes/objectc/3902