从 WatchOS 捕获 Apple Watch 的型号标识符

问题描述

看起来似乎没有任何官方记录的从手表应用程序获取 Apple Watch 模型的方法，但是这篇文章展示了 sysctlbyname 的特殊用途:

It looks like there aren't any documented official methods of obtaining the Apple Watch model from a watch app, but there is this post showing special use of sysctlbyname:

如何确定 Apple Watch 型号?

谁能帮我弄清楚为什么这个功能不起作用?它有时会返回

Could anyone help me figure out why this function isn't working? It sometimes returns

手表\t"

而不是预期

Watch2,4"

Swift 的 sysctlbyname 函数似乎就是这里描述的这个 c 函数:https://opensource.apple.com/source/Libc/Libc-167/gen.subproj/sysctlbyname.c.auto.html

Swift's sysctlbyname function seems to be this c function described here:https://opensource.apple.com/source/Libc/Libc-167/gen.subproj/sysctlbyname.c.auto.html

我的代码是从 SO 帖子中的 swift answer 复制而来的:

My code is copied from the swift answer in the SO post:

private func getWatchModel() -> String? {
   var size: size_t = 0
   sysctlbyname("hw.machine", nil, &size, nil, 0)
   var machine = CChar()
   sysctlbyname("hw.machine", &machine, &size, nil, 0)
   return String(cString: &machine, encoding: String.Encoding.utf8)?.trimmingCharacters(in: .whitespacesAndNewlines)
} // Should return a string like "Watch2,4"

推荐答案

你从不分配缓冲区来接收机器字符串.改变

You never allocate a buffer to receive the machine string.Change

var machine = CChar()

到

var machine = [CChar](repeating: 0, count: size)

你应该没事了！

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