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在 AHK 中，Try/Catch 和 OnError() 有什么区别？何时使用其中之一？

[英]In AHK, what is the difference between Try/Catch and OnError()? When to use one or the other?

原文 2021-06-18 15:44:21 4 1 error-handling/ autohotkey

I am currently writing an AHK script that reads and writes files.我目前正在编写一个读写文件的 AHK 脚本。 I would like to handle the possible I/O errors, but the doc isn't clear to me regarding wether I should use Try/Catch or OnError() .我想处理可能的 I/O 错误，但我不清楚该文档是否应该使用Try/Catch或OnError() 。

What is the difference between the two ?两者有什么区别？ And when to use one or the other ?什么时候使用一个或另一个？

1 个解决方案

So, after some more research, here is my understanding:所以，经过一些更多的研究，这是我的理解：

Try/Catch : Use it to:尝试/捕捉：用它来：
- Specifically identify certain lines of code over which it will be applied.具体确定将应用它的某些代码行。
- Then, if you would like, proceed with the execution.然后，如果您愿意，请继续执行。
- A Try/Catch allows to proceed with the execution of the command after the Try block that failed. Try/Catch 允许在 Try 块失败后继续执行命令。
- (But, a Try/Catch does not allow to proceed with the execution of the command after the one that failed within the Try block. For example if 5 commands are wrapped, then if the 2nd one threw, it will not be possible to proceed with the execution from the 3rd after doing something in the Catch-block.) （但是，一个try / catch不允许与所述命令中的一个失败的尝试块内后执行继续。例如，如果5级的命令被包裹，则如果第二一个投掷，它不会有可能继续进行在 Catch-block 中执行某些操作后从第 3 次开始执行。）
OnError() : Use it to OnError() ：使用它
- Deal with any unhandled error.处理任何未处理的错误。
- Block (or not) the default error dialog.阻止（或不阻止）默认错误对话框。
- In any cases the thread execution is stopped after you handled the error.在任何情况下，处理错误后线程执行都会停止。
- There can be multiple OnError() handlers active at a time, and you can decide, in which order they will be executed (or to stop the execution after any one of them) when an error occurs.一次可以有多个 OnError() 处理程序处于活动状态，您可以决定在发生错误时以何种顺序执行它们（或在其中任何一个之后停止执行）。
- If all handlers return 0 all handlers are called one after the other, then the default error message is displayed, then the thread exits.如果所有处理程序都返回 0，则所有处理程序都被一个接一个地调用，然后显示默认错误消息，然后线程退出。 If any handler returns a non-zero integer, the thread exits without calling the following handlers and without displaying the default error dialog.如果任何处理程序返回非零整数，则线程退出而不调用以下处理程序并且不显示默认错误对话框。