终止IronPython脚本

问题描述

这可能不是IronPython的特别问题，所以那里的Python开发人员可能可以提供帮助.

This may not specifically be an IronPython question, so a Python dev out there might be able to assist.

我想使用IronPython在.Net桌面应用程序中运行python脚本，并希望为用户提供强制终止脚本的功能.这是我的测试脚本(我是Python的新手，所以可能并不完全正确):-

I want to run python scripts in my .Net desktop app using IronPython, and would like to give users the ability to forcibly terminate a script. Here's my test script (I'm new to Python so it might not be totally correct):-

import atexit
import time
import sys

@atexit.register
def cleanup():
    print 'doing cleanup/termination code'
    sys.exit()

for i in range(100):
    print 'doing something'
    time.sleep(1)

(请注意，我可能想在某些脚本中指定一个"atexit"函数，使它们可以在正常或强制终止期间执行任何清除操作.)

(Note that I might want to specify an "atexit" function in some scripts, allowing them to perform any cleanup during normal or forced termination).

在我的.Net代码中，我使用以下代码来终止脚本:

In my .Net code I'm using the following code to terminate the script:

_engine.Runtime.Shutdown();

这将导致调用脚本的atexit函数，但脚本实际上并未终止-for循环继续进行.其他几篇SO文章(在此处和)说sys.exit()应该可以解决问题，那么我想念的是什么?

This results in the script's atexit function being called, but the script doesn't actually terminate - the for loop keeps going. A couple of other SO articles (here and here) say that sys.exit() should do the trick, so what am I missing?

推荐答案

似乎无法终止正在运行的脚本-至少不能以友好"的方式终止.我见过的一种方法是在另一个线程中运行IronPython引擎，并在需要停止脚本时中止线程.

It seems that it's not possible to terminate a running script - at least not in a "friendly" way. One approach I've seen is to run the IronPython engine in another thread, and abort the thread if you need to stop the script.

我并不热衷于这种暴力破解方法，因为这样做可能会使脚本使用的任何资源(例如文件)处于打开状态.

I wasn't keen on this brute-force approach, which would risk leaving any resources used by the script (e.g. files) open.

最后，我创建一个C#帮助器类，如下所示:-

In the end, I create a C# helper class like this:-

public class HostFunctions
{
    public bool AbortScript { get; set; }

    // Other properties and functions that I want to expose to the script...
}

当托管应用程序想要终止脚本时，它将AbortScript设置为true.该对象通过范围传递给正在运行的脚本:-

When the hosting application wants to terminate the script it sets AbortScript to true. This object is passed to the running script via the scope:-

_hostFunctions = new HostFunctions();
_scriptScope = _engine.CreateScope();
_scriptScope.SetVariable("HostFunctions", _hostFunctions);

在我的脚本中，我只需要策略性地进行检查以查看是否已请求中止，并进行适当的处​​理，例如:-

In my scripts I just need to strategically place checks to see if an abort has been requested, and deal with it appropriately, e.g.:-

for i in range(100):
    print 'doing something'
    time.sleep(1)
    if HostFunctions.AbortScript:
        cleanup()

这篇关于终止IronPython脚本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！