获得手机的IP（联网的ip）

//ip

- (NSString *)deviceIPAdress {

    NSString *address =@"an error occurred when obtaining ip address";

    struct ifaddrs *interfaces =NULL;

    struct ifaddrs *temp_addr =NULL;

    int success = 0;

    

    success = getifaddrs(&interfaces);

    

    if (success == 0) { // 0 表示获取成功

        

        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 = [NSString stringWithUTF8String:inet_ntoa(((structsockaddr_in *)temp_addr->ifa_addr)->sin_addr)];

                }

            }

            

            temp_addr = temp_addr->ifa_next;

        }

    }

    

    freeifaddrs(interfaces);

    

    //    NSLog(@"手机的IP是：%@", address);

    

    return address;

}