从主机名获得服务器IP地址(Obtaining a server IP address from hostname)

从主机名获得服务器IP地址(Obtaining a server IP address from hostname)

在对主机名执行NSURLRequest ，是否可以获取响应来自的服务器的IP地址？

NSURL方法：

- (NSString *)host;

只是返回主机名，我看不到任何其他NSURL方法获取IP地址的方法。

也许有一种在启动NSURLRequest之前执行主机查找的方法？

When performing an NSURLRequest to a hostname, is it possible to obtain the IP address of the server that the response came from?

The NSURL method:

- (NSString *)host;

simply returns the hostname, and I see no way of obtaining the IP address from any of the other NSURL methods.

Perhaps there is a way of performing a host lookup before inititing the NSURLRequest?

最满意答案

您可以使用系统调用gethostbyname（）来解析主机名，然后使用返回的结构来获取IP地址。 看看最后一部分的inet_ntop（） 。

示例代码

struct hostent *hostentry; hostentry = gethostbyname("google.com"); char * ipbuf; ipbuf = inet_ntoa(*((struct in_addr *)hostentry->h_addr_list[0])); printf("%s",ipbuf);

You can use the system call gethostbyname() to resolve a hostname then use the returning structure to get the ip address. Have a look at inet_ntop() for this last part.

EXAMPLE CODE

struct hostent *hostentry; hostentry = gethostbyname("google.com"); char * ipbuf; ipbuf = inet_ntoa(*((struct in_addr *)hostentry->h_addr_list[0])); printf("%s",ipbuf);