AutoHotkey Community

1) I found the following exmple:



Why errorllevel is set as blank,and then it is denoting that "it's not blank or zero!!!" ???
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2)Here

it is written that

How to know the exitcode?

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3)The command for runwait is:





For UseErrorLevel, used in that command, it is written that:


What does it mean by "sets ErrorLevel to the word ERROR" ?

Can ERRORLEVEL be given values containing letters also?

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4) Excepting 0, 1, Can errorlevel be given other values in digit?

Hi, I will try to help. I'm not very good at quoting in this type of forum, so I will take your questions as you numbered them.

1. This code DOES work for me. IOW, it gave me the message box saying 'The Window Exists". The only thing I changed was the window title in the first line of your code. If you are waiting for a specific window, you must as with any title-matching, specify either the exact window title, or SetMatchMode to indicate that your title text is a subset of the complete window title, etc. Also, case must match. So since you didn't SetMatchMode, I changed 'MyWindow' to 'AutoHotkey Help' which is a window open on my computer right now.

2. How to know an exit code returned - In early stages of development, you may put in statements you know you won't use later, just to be sure of what is going on. So I would simply do something like this:
MsgBox, Errorlevel is %errorlevel%

At such point you know what exit codes you are looking for, you will change this to check for equalities or inequalities, still using errorlevel. Keep in mind though that you need to check errorlevel immediately, or else store it to another var immediately, as many statements change the errorlevel value, so you need to grab it.

3. 'Errorlevel' is nothing more than a regular var name. We use it for a specific purpose however, and AHK often uses it to pass info back to us. It can contain any data which any variable can contain. You may, in fact, want to use it (set it) yourself in a function to pass info back to the calling code for the function.

4. See above, I think that (hopefully) explains the answer to this.

Best,

Bob

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When it comes to Binary, there are 10 types of people. Those who get it and those who don't.

Thanks a lot for clarifying question 2,3 and 4.

For Question number 1, The script is working fine for me.

What i asked is that why the blank space is there after errorlevel, and then it is denoting 'It's not blank or zero' .

It is only a comment "It's not blank or zero"
You could also writeThe first msgbox will be shown if ErrorLevel is "someting", e.g. meaning it is not blank or zero.
In the case that ErrorLevel is blank or zero the second msgbox will be shown.

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Ciao
toralf

I prefer to write this as:

If Errorlevel = ; if errorlevel is blank or empty

To empty a variable:

var =

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"Anything worth doing is worth doing slowly." - Mae West

What it means is this -

If the window is found, then the error level will be set to 0 (meaning there was no problem finding it)

then - if errorlevel (meaning if the errorlevel has a value other than 0) proceed to inform the user that there was a problem

but if there was no problem (ie the else command) then inform the user that the window exists.

does that help?

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