Executing a function - How to get a result

[Zryip TheSlug]

The com.livecode.date library seems actually very limited.

For getting the list of the weekdayNames, I have tried:

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private handler getWeekDaysName() as List
   variable tStringList as String
   variable tDayNamesList as List

   execute script "get the system weekdayNames"
   put the result into tStringList
   split tStringList by return into tDayNamesList
  
  return tDayNamesList
end handler

But the engine is returning an error at the line:
put the result into tStringList

How can I get the result of a function when using "execute script"?

[trevordevore]

You need to return the value, not get it.

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execute script "return the system weekdayNames"

[Zryip TheSlug]

Trevor,

I should have thought to a simple "return". Thanks!

That's said I'm not sure the syntax for defining property options:

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metadata fontName.options is "execute:get the fontnames; sort it" 

is not confusing. It confused me.

[Zryip TheSlug]

You need to return the value, not get it.

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execute script "return the system weekdayNames"

I gave this syntax a try:

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variable tStringList as String
execute script "return the system weekdayNames"
put the result into tStringList

and I got this error from the engine:

"Value is not of correct type for assignment to variable - expected type livecode.lang.string for assigning to variable tStringList".

We can assume, "the result" contains nothing or not the value we are expecting or
the engine is failing to type the result "object" in this case.
Or, on the other hand we can assume I do not know how to get a result.

Anyway, I can't figure out how the engine could give a type to "the result" as the type is totally hidden until the execute command has been interpreted by the engine.

For example, the result could contain:

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execute script "return true" -- a boolean
execute script "return 1" -- an integer
execute script "return test" -- a string

And the developer would expected to get a string in all the cases.

As we can't give a type to "the result" ourself, the syntax for the execute script command would be:

execute script "myScript" as [Type]

[trevordevore]

Hmm, this is the code I tested in do-1 and it works for me.

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public handler OnOpen()
		variable tStringList as String
		variable tDayNamesList as List
		
		execute script "return the system weekdayNames"
		put the result into tStringList
		split tStringList by "," into tDayNamesList
		 
		log "%@, %@" with [tStringList,tDayNamesList] 
end handler

Are you sure your updated code is compiling? If you have installed the extension and you try to test new code from the extensionManager then the installed extension is run, not the updated code. You would need to uninstall it, restart, and then try testing again.

[Zryip TheSlug]

I found the problem.

You are in the OnOpen message.

The same code executed in the OnPaint or in the OnCreate message is returning the error.

The OnPaint message is probably not the best place for executing this kind of command, but I used it for testing. The OnCreate is more appropriated, though.

I will report this in the RQCC.

[trevordevore]

Actually, that probably isn't a bug. I remember reading that you can't execute code within certain handlers as it has the potential to create problems.

[Zryip TheSlug]

You're right. In the documentation itself. For the OnPaint and OnCreate messages we have a big note:

Note: Access to most script object operations is not allowed whilst an OnPaint handler is running.

I will just report a typo in the documentation about the note concerning the OnCreate message, which seen to be a copy paste of the OnPaint note.