从WatchOS捕获Apple Watch的型号标识符 [英] Capture model identifier for Apple Watch from WatchOS

问题描述

似乎没有任何从手表应用程序获取Apple Watch模型的官方方法，但是这篇文章显示了 sysctlbyname 的特殊用法:

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模型?

有人可以帮助我弄清楚为什么此功能不起作用吗?有时会返回

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

"Watc \ t"

"Watc\t"

而不是预期的

"Watch2,4"

"Watch2,4"

Swift的sysctlbyname函数似乎是这里描述的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帖子的快速答案中复制的:

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

您永远不会分配缓冲区来接收机器字符串.更改

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

var machine = CChar()

到

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

你应该很好！

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