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Re: How to simulate C's function pointer in AppleScript?
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Re: How to simulate C's function pointer in AppleScript?


  • Subject: Re: How to simulate C's function pointer in AppleScript?
  • From: AndrĂ© Berg <email@hidden>
  • Date: Thu, 23 Oct 2008 14:50:44 +0200

Title: Re: How to simulate C's function pointer in AppleScript?

--- Original Nachricht ---
Absender: Jay Louvion
Datum: 23.10.2008 13:03 Uhr
Have you tried declaring it as global ?

Best,

j.

Thank you for replying. :) I failed to mention that I had tried that already.


--- Original Nachricht ---
Absender: Philip Aker
Datum: 23.10.2008 13:22 Uhr
On Oct 23, 2008, at 3:58 AM, André Berg wrote:

The question now is how can I correctly pass, from the top-level script, myHandlerToTime() in the statement property of the Timer script so that it gets used as the direct parameter to the run script command inside the Timer script?

on doHandlerToTime()
display dialog "beep"
end doHandlerToTime

script Timer
property procedure : missing value
on timeit()
run script procedure
end timeit
end script

set Timer's procedure to doHandlerToTime
Timer's timeit()

Passing parameters is a different story ;-)

Ok, seems like this was the missing piece. Thank you very much. :)
I didn't think of trying to pass the handler name as type and not in a string.
So far so good...

But as we all know, it's never easy, now is it?
My handler of course has three parameters.

I think I will give the user the possibility to specify either an
AppleScript syntax string, or a script object that does the parameter
setup and calling of the handler to time itself, so that I can just pass
it to the "run script" command:

-- either a script object
script scriptToTime
    -- setup arguments for the function to time
    on handlerToTime("spam", "eggs")
        -- magic ...
    end handlerToTime
end script

-- or an AS syntax string
set Timer's statement to "tell app \"Finger\" to count fingers"

script Timer
    property statement : missing value
    -- start timer
    run script my statement  
    -- end timer
end script

There might be a downside of a small overhead that I cannot exactly calculate
this way, but the effect of being able to time handlers instead of only statements
far outweighs that in my humble opinion and executing code inside one AppleScript
component is always subject to rather large fluctuations in time compared to other
languages.


Btw, might be related to this question, the "run script" command has an optional
parameter called "in" that is used to specify the scripting component that it should use as
execution context, but in my tests I couldn't get it to work. The unicode text to specify
is the name of a script object, right?

Again thanks to you both for posting your replies :)


André
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  • Follow-Ups:
    • Re: How to simulate C's function pointer in AppleScript?
      • From: Philip Aker <email@hidden>
    • Re: How to simulate C's function pointer in AppleScript?
      • From: "Mark J. Reed" <email@hidden>
References: 
 >How to simulate C's function pointer in AppleScript? (From: AndrĂ© Berg <email@hidden>)
 >Re: How to simulate C's function pointer in AppleScript? (From: Philip Aker <email@hidden>)

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