WatchOS 2 和 CFStream 的套接字连接 [英] Socket connection from WatchOS 2 and CFStream

问题描述

我必须通过 Watch 的 tcp 套接字连接远程服务器.

I have to connect a remote server via tcp socket from the Watch.

我已经使用 CFStream 编写了一段代码，它可以在 Watch 模拟器中完美运行.

I have already written a piece of code using CFStream which works perfectly from the Watch simulator.

当我在 Watch 上运行它时，出现此错误:

When I run it on the Watch I get this error:

无法完成操作.无法分配请求的地址(代码 = 49)

The operation couldn’t be completed. Can't assign requested address (Code = 49)

当我尝试使用 CFStreamCreatePairWithSocketToHost 打开与服务器的连接时.

when I try to open the connection to the server using CFStreamCreatePairWithSocketToHost.

Apple 文档声明 CFStreamCreatePairWithSocketToHost 是

The Apple documentation declares that CFStreamCreatePairWithSocketToHost is

适用于 watchOS 2.0 及更高版本.

Available in watchOS 2.0 and later.

所以我希望它应该可以工作，但我找到了这个 Apple 工程师的回答，它确认无法从 Watch 打开 tcp 连接:

so I expected that it had should work but I have found this Apple's engineer answer which confirms that there is no way to open a tcp connection from the Watch:

Socket 通信不适用于真正的 Apple Watch

谁能澄清并帮助我理解?

Can anyone clarify and help me to understand?

假设我不能从Watch打开tcp连接，既然我不能使用[NSURLSession]，我有什么样的选择?

Supposing that I cannot open a tcp connection from the Watch, what kind of alternatives have I, since I cannot use [NSURLSession]?

我可以使用 [WCSession] 提供的一种通信方法，但是当 iPhone 应用程序未运行或不在前台时，它们是否有效?

I could use one of the communication methods provided by [WCSession] but do they work when the iPhone app either is not running or is not in foreground?

推荐答案

你可以使用 WCSession 的 sendMessage API 在后台唤醒 iOS 应用程序并让它执行流工作你.

You could use WCSession's sendMessage APIs to wake the iOS app up in the background and have it do the Stream work for you.

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