proc中的Expect_after/expect_background的行为与全局调用时的行为是否有所不同? [英] Is behavior of expect_after/expect_background in proc different than when called globally?

问题描述

我正在自动完成一些期望工作，并且有类似以下内容的东西:

I'm automating some work with expect, and have something like the following:

# procedure to set background and after patterns
proc foo {} {
    expect_after {
        -re $regex1 {puts "Matched regex1"; send $command_to_run; exp_continue}
        timeout {exp_continue}
    }
    expect_background {
        -re $regex2 {do other things; exp_continue}
        -re $regex3 {and more different things; exp_continue}
        timeout {exp_continue}
    }
}

spawn $thing
foo
expect_user {
    -ex "stahp" {exit}
}

在匹配expect_after模式(并运行关联的主体)之后，该控件将无限期挂起.但是，如果将expect_after和expect_background模式从过程中移出，那么它将按预期运行.

This hangs indefinitely after expect_after pattern is matched (and the associated body is run). However, if I move the expect_after and expect_background patterns out of the procedure, then it runs as I, well, expected.

为什么放在程序中时行为会有所不同?

Why does it behave differently when put in a procedure?

推荐答案

非常感谢glenn jackman！似乎在过程中调用expect_after，expect_background和可能的expect_before时，不仅要查找处于全局范围内的spawn_id，还需要指定它.

Thanks to glenn jackman for the idea! It seems that when called in a procedure, expect_after, expect_background, and probably expect_before not only look for the spawn_id which is in the global scope, but need it specified.

这有效:

proc foo {} {
    namespace eval global {
        expect_after {
            -i $spawn_id -re $regex1 {do things}
        }
        expect_background {
            -i $spawn_id -re $regex2 {do more different things}
            -i $spawn_id ...
        }
    }
}

如果任何人都可以解释为什么它需要-i $spawn_id的原因，那将是很好的，但这是针对遇到相同问题的任何人的解决方案.添加global spawn_id也应该可以，但是我最终使用了它，因为我有大约5-6个变量，其中一半是在foo中修改的.

If anyone can explain why it needs -i $spawn_id that would be great, but here's a fix for anyone running into the same problem. Adding a global spawn_id should also work, but I ended up using this as I have about 5-6 variables, half of which I modify in foo.

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