本文介绍了Swift:命令行工具退出回调的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我需要知道用户何时停止了命令行程序,以从命令行程序(在终端上运行)释放一些活动的蓝牙连接,并且写得很快。

I need to know when a command line program is stopped by the user to release some active bluetooth connections from a command-line program (running on the terminal), written in swift.

说用户调用程序,然后按ctrl + Z退出。
我怎么知道?

Say the user calls the program then exits by pressing ctrl+Z.How would I know ?

推荐答案

您可以使用Swift安装信号处理程序。例如:

You can install a signal handler with Swift. For example:

import Foundation

let startTime = Date()
var signalReceived: sig_atomic_t = 0

signal(SIGINT) { signal in signalReceived = 1 }

var i = 0
while true {
    if signalReceived == 1 { break }
    usleep(500_000)
    if signalReceived == 1 { break }
    i += 1
    print(i)
}

let endTime = Date()
print("Program has run for \(endTime.timeIntervalSince(startTime)) seconds")

从修改。

这篇关于Swift:命令行工具退出回调的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-03 23:36
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