iphone - 可达性reachabilityWithAddress不起作用

Question

我正在尝试使用以下代码确定 iPhone 是否可以连接到我的 IP 地址

struct sockaddr_in server_address;   
server_address.sin_len = sizeof(server_address);
server_address.sin_family = AF_INET;
server_address.sin_port = htons(8888);
server_address.sin_addr.s_addr = inet_addr("1.2.3.4");
Reachability *r = [[Reachability reachabilityWithAddress:&server_address ] retain];
NetworkStatus internetStatus = [r currentReachabilityStatus];

但无论我在 IP 地址中提供什么，它总是显示状态为“可访问”。我做错了什么吗？为什么这不起作用？感谢您的见解。

Answer 1

查看此答案 ( https://stackoverflow.com/a/5875059/1067154 )

SCNetworkReachability Reference

The SCNetworkReachability programming interface allows an application to determine the status of a system's current network configuration and the reachability of a target host.

A remote host is considered reachable when a data packet, sent by an application into the network stack, can leave the local device. Reachability does not guarantee that the data packet will actually be received by the host.