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OSX 的网络连接 NSNotification？

发布于 2024-09-02 19:19:05 字数 115 浏览 4 评论 0原文

我只需要在分配有效 IP 地址时发出通知即可。我尝试过通过 SCreachability 进行轮询，但这似乎效率低下。

有什么建议吗？这看起来应该很简单，但我已经努力了几个小时才能让任何东西发挥作用。

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笑饮青盏花 2024-09-09 19:19:05

我知道这有点旧，但所选的答案并不理想。

SCreachability API 可用于了解特定主机何时可访问。如果您想知道的是何时分配有效的 IP 地址（而不是到目标 IP 的可行路由），那么您应该查看 SCDynamicStore* API。
这些功能允许您订阅系统的配置存储，以便在某些值发生更改时收到通知。
因此，要在任何接口上的 IPv4 地址发生更改时发出通知，您需要执行以下操作（为了可读性而删除了错误检查）。

  SCDynamicStoreRef dynStore;

  SCDynamicStoreContext context = {0, NULL, NULL, NULL, NULL};

  dynStore = SCDynamicStoreCreate(kCFAllocatorDefault,
                                  CFBundleGetIdentifier(CFBundleGetMainBundle()),
                                  scCallback,
                                  &context);

    const CFStringRef keys[3] = {
        CFSTR("State:/Network/Interface/.*/IPv4")
    };
    CFArrayRef watchedKeys = CFArrayCreate(kCFAllocatorDefault,
                                         (const void **)keys,
                                         1,
                                         &kCFTypeArrayCallBacks);
    if (!SCDynamicStoreSetNotificationKeys(dynStore,
                                         NULL,
                                         watchedKeys)) 
  {
       CFRelease(watchedKeys);
        fprintf(stderr, "SCDynamicStoreSetNotificationKeys() failed: %s", SCErrorString(SCError()));
        CFRelease(dynStore);
        dynStore = NULL;

        return -1;
    }
    CFRelease(watchedKeys);

    rlSrc = SCDynamicStoreCreateRunLoopSource(kCFAllocatorDefault, dynStore, 0);
    CFRunLoopAddSource(CFRunLoopGetCurrent(), rlSrc, kCFRunLoopDefaultMode);
    CFRelease(rlSrc);

您将需要实现 scCallback 函数，每当发生更改时都会调用该函数。此外，您还需要在某处调用 CFRunLoopRun 以使代码运行。

I know this is a bit old but the selected answer is not ideal.

The SCReachability API can be used to know when a particular host is reachable. If all you want to know is when a valid IP address is assigned (rather than a viable route to a target IP) then you should look at the SCDynamicStore* APIs instead.
These functions allow you to subscribe to the system's configuration store for notification when certain values change.
So, for notification when the IPv4 address changes on any interface you would do the following (error checking removed for readability)

  SCDynamicStoreRef dynStore;

  SCDynamicStoreContext context = {0, NULL, NULL, NULL, NULL};

  dynStore = SCDynamicStoreCreate(kCFAllocatorDefault,
                                  CFBundleGetIdentifier(CFBundleGetMainBundle()),
                                  scCallback,
                                  &context);

    const CFStringRef keys[3] = {
        CFSTR("State:/Network/Interface/.*/IPv4")
    };
    CFArrayRef watchedKeys = CFArrayCreate(kCFAllocatorDefault,
                                         (const void **)keys,
                                         1,
                                         &kCFTypeArrayCallBacks);
    if (!SCDynamicStoreSetNotificationKeys(dynStore,
                                         NULL,
                                         watchedKeys)) 
  {
       CFRelease(watchedKeys);
        fprintf(stderr, "SCDynamicStoreSetNotificationKeys() failed: %s", SCErrorString(SCError()));
        CFRelease(dynStore);
        dynStore = NULL;

        return -1;
    }
    CFRelease(watchedKeys);

    rlSrc = SCDynamicStoreCreateRunLoopSource(kCFAllocatorDefault, dynStore, 0);
    CFRunLoopAddSource(CFRunLoopGetCurrent(), rlSrc, kCFRunLoopDefaultMode);
    CFRelease(rlSrc);

You will need to imlement the scCallback function which will be called whenever there is a change. Also you'll need to call CFRunLoopRun somewhere to make the code go.

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