Hey re, fellow iOS developers! If you're looking to get your device's external IP address using Objective-C, you've come to right place. In this article, I'm gonna walk you through process, but don't expect anything too fancy or too structured. Let's just dive right in!，痛并快乐着。

Why Do You Need External IP Address?

Alright, so you might be wondering why you would even need to get external IP address of your device. Well, let me tell you, re are plenty of reasons. Maybe you 层次低了。 want to set up a server that only your device can access, or maybe you're just curious. Who knows? The point is, it's not that hard to do, and I'll show you how.

Using System APIs

One way to get external IP address is by using system APIs. This method involves a bit of networking and some Objective-C magic. Here's a snippet of code that does just that:

    #import 
    #import 
    #import 
    #import 
    NSString *getExternalIPAddress() {
        struct sockaddr_in sin;
        struct sockaddr *sa;
        socklen_t len;
        int s;
        char ip;
        s = socket(AF_INET, SOCK_DGRAM, 0);
        if (s == -1) {
            return nil;
        }
        sin.sin_family = AF_INET;
        sin.sin_port = htons(12345);
        sin.sin_addr.s_addr = htonl(INADDR_ANY);
        sa = (struct sockaddr *)&sin
        len = sizeof(sin);
        if (bind(s, sa, len) == -1) {
            close(s);
            return nil;
        }
        if (connect(s, sa, len) == -1) {
            close(s);
            return nil;
        }
        getsockname(s, sa, &len);
        inet_ntop(AF_INET, &sin.sin_addr, ip, INET_ADDRSTRLEN);
        close(s);
        return ;
    }
    

This code creates a socket, binds it to an address, and connects to it. Then it retrieves external IP address and returns it as a string. Simple, right? Well, it's not that simple, but it's a start.

Using Third-Party Services

Anor way to get external IP address is by using third-party services. These services provide an API that you can call to get your IP address. One such service is ipify. Here's how you can use it:

    NSString *externalIPAddress = ;
    NSData *jsonData = ];
    NSDictionary *jsonDictionary = ;
    NSString *ipAddress = ;
    

This code sends a request to ipify API and parses response to get external IP address. It's a bit more complex than previous method, but it works well and is a good alternative.

Putting It All Toger

Now that you know how to get external IP address using both system APIs and third-party services, you can choose m 上手。 ethod that works best for your project. Just remember to handle errors and edge cases, and you should be good to go.

Conclusion

So, re you have it. You now know how to get external IP address of your iOS device using Objective-C. Wher you're using system APIs or third-party services, process is relatively straightforward. Just remember to test your code thoroughly and handle any potential issues that may arise. Happy coding!