IP地址？ - 可可

我如何制作一个 GUI 程序，只需单击一个按钮即可显示您的 IP 地址？拜托，没有什么困难的解释，我不久前刚刚开始使用 Cocoa。

Thanks,

Kevin

您可以通过两种方式获取IP地址：

1-如果您想获取当前使用网络上的本地ip地址，可以使用以下方法检索：

-(NSString *)getIPAddress
{
    NSString *address = @"error";
    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;
    int success = 0;

    // retrieve the current interfaces - returns 0 on success
    success = getifaddrs(&interfaces);
    if (success == 0)
    {
        // Loop through linked list of interfaces
        temp_addr = interfaces;
        while(temp_addr != NULL)
        {
            if(temp_addr->ifa_addr->sa_family == AF_INET)
            {
                    // Get NSString from C String
                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
            }
            temp_addr = temp_addr->ifa_next;
        }
    }

    // Free memory
    freeifaddrs(interfaces);
    return address;
}

2-如果你想获取外部IP地址那么你需要使用以下方法：

-(NSString*)getIP
{
    NSUInteger  an_Integer;
    NSArray * ipItemsArray;
    NSString *externalIP;

    NSURL *iPURL = [NSURL URLWithString:@"http://www.dyndns.org/cgi-bin/check_ip.cgi"];

    if (iPURL) {
        NSError *error = nil;
        NSString *theIpHtml = [NSString stringWithContentsOfURL:iPURL encoding:NSUTF8StringEncoding error:&error];
        if (!error) {
            NSScanner *theScanner;
            NSString *text = nil;

            theScanner = [NSScanner scannerWithString:theIpHtml];

            while ([theScanner isAtEnd] == NO) {

                // find start of tag
                [theScanner scanUpToString:@"<" intoString:NULL] ;

                // find end of tag
                [theScanner scanUpToString:@">" intoString:&text] ;

                // replace the found tag with a space
                //(you can filter multi-spaces out later if you wish)
                theIpHtml = [theIpHtml stringByReplacingOccurrencesOfString:
                             [ NSString stringWithFormat:@"%@>", text]
                                                                 withString:@" "] ;
                ipItemsArray =[theIpHtml  componentsSeparatedByString:@" "];
                an_Integer=[ipItemsArray indexOfObject:@"Address:"];
                externalIP =[ipItemsArray objectAtIndex:  ++an_Integer];
            }
            NSLog(@"%@",externalIP);
        } else {
            NSLog(@"Oops... g %d, %@", [error code], [error localizedDescription]);
        }
    }
    return externalIP;
}