如何查询iPhone的当前IP地址？ [英] How do I query the iPhone's current IP address?

问题描述

如何查询iPhone的当前IP地址？

How do I query the iPhone's current IP address?

推荐答案

如果您想要外部 IP地址（用于从本地网络外部连接的IP地址），您需要查询外部网络上的服务器。快速搜索产生以下内容： http://checkip.dyndns.org ， http://www.whatismyip.com 。使用例如加载页面非常简单。

If you want the external IP address (the one used to connect from outside the local network), you need to query a server on the external network. A quick search yielded the following: http://checkip.dyndns.org, http://www.whatismyip.com. It is quite simple to load the page using e.g.

[NSData dataWithContentsOfURL:url]

并执行一些字符串操作以检索IP地址。

and do some string manipulation to retrieve the IP address.

如果您想要内部 IP地址（例如由DHCP分配给您的设备），您通常可以解析设备的主机名，即

If you want the internal IP address (the one assigned e.g. by DHCP to your device), what you can usually do is to resolve the device's hostname, i.e.

/*
Returns the local IP, or NULL on failure.
*/
const char* GetLocalIP() {
  char buf[256];
  if(gethostname(buf,sizeof(buf)))
    return NULL;
  struct hostent* he = gethostbyname(buf);
  if(!he)
    return NULL;
  for(int i=0; he->h_addr_list[i]; i++) {
    char* ip = inet_ntoa(*(struct in_addr*)he->h_addr_list[i]);
    if(ip != (char*)-1) return ip;
  }
  return NULL;
}

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