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Re: Looking for clarification on Applescript event handlers
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Re: Looking for clarification on Applescript event handlers


  • Subject: Re: Looking for clarification on Applescript event handlers
  • From: Christopher Nebel <email@hidden>
  • Date: Sun, 10 Aug 2003 21:29:33 -0700

On Sunday, August 10, 2003, at 1:43 PM, Chris Backas wrote:

The NSAppleScript class has an executeAppleEvent method, which takes an AppleEventDescriptor as an argument. I've seen on the Applescript side that one makes an event handler something like:

on <some event>(<some argument>)
<do stuff>
end <some event>

My confusion is, does that single AppleEventDescriptor I pass encompass both <some event> and <some argument> ? If I want to pass a list to a handler in an applescript, do I need to declare my own kind of handler someplace with its own ID, or are there preexisting ones that I'm meant to utilize?

This question would have been more appropriately asked on applescript-implementors, but never mind that. You should go read QA1111, "Calling an Applescript and providing parameters from an application," <http://developer.apple.com/qa/qa2001/qa1111.html>. It's written for C, but shouldn't be too hard to translate to Obj-C.

The basic point is that an "event" encapsulates both the handler name and its parameters. The handler you use can be defined one of three ways:

1. Define your own handler name and call it with positional parameters, as in QA1111.
2. Define terminology for your handler and call it with named parameters (Folder Actions does this).
3. Use an existing standard handler, such as "run" or "open".

As far as how to call them, #1 is illustrated in QA1111. #2 is just like sending a "normal" Apple event to an application, and #3 is just a special case of #2. Obviously, using #3 appropriately depends on what you intend to do in the handler.


--Chris Nebel
Apple Development Tools
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 >Looking for clarification on Applescript event handlers (From: Chris Backas <email@hidden>)

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