python - 如何在应用程序退出时正确终止线程

Question

我正在使用 pythonnet 制作简单的 gui。

import os, sys, ntpath, threading
from subprocess import call

import clr
clr.AddReference("System")
clr.AddReference("System.Windows.Forms")


import System
import System.Windows.Forms as WinForms
from System.Threading import ApartmentState, Thread, ThreadStart
from System.Windows.Forms import (Application, Form, Button)
from System.Drawing import Point

class demo(WinForms.Form):
    def __init__(self):
        self.filename = None
        self.InitializeComponent()

    def InitializeComponent(self):
        """Initialize form components."""
        self.components = System.ComponentModel.Container()
        self.btn = Button()
        self.btn.Parent = self
        self.btn.Click += self.process
        self.CenterToScreen()
        self.cmd = "Running forever command"

    def Dispose(self):
        self.components.Dispose()
        WinForms.Form.Dispose(self)

    def thread_process(self):
        call(self.cmd, shell=True)
        pass

    def process(self, sender, args):
        self.thread = threading.Thread(target=self.thread_process, daemon=True)
        self.thread.start()

    def OnClickFileExit(self, sender, args):
        self.Close()

WinForms.Application.Run(demo())

它工作正常，但是当我单击“退出”按钮时，显然应用程序不会停止。当用户关闭应用程序时如何正确停止正在运行的线程？

Answer 1

如果适合您的需要，您可能想尝试将 process 线程设置为 deamon 线程:

self.thread = threading.Thread(target=self.thread_process, daemon=True)

以下是有关守护线程的一些信息:

A thread can be flagged as a “daemon thread”. The significance of this flag is that the entire Python program exits when only daemon threads are left. The initial value is inherited from the creating thread. The flag can be set through the daemon property.

Source: https://docs.python.org/2/library/threading.html#thread-objects