客户端获取本地ip地址

- (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 ([[NSStringstringWithUTF8String: temp_addr->ifa_name]isEqualToString:@"en0"]) {

                    //Get NSString from C String

                    address =[NSStringstringWithUTF8String:inet_ntoa(((structsockaddr_in *) temp_addr->ifa_addr)->sin_addr)];

                }

            }

            temp_addr = temp_addr->ifa_next;

        }

    }

    //Free memory

   freeifaddrs(interfaces);

    NSLog(@"addrees----%@",address);

   return address;

}