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Re: True-False vs True-Error
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Re: True-False vs True-Error


  • Subject: Re: True-False vs True-Error
  • From: email@hidden
  • Date: Sun, 12 Oct 2008 17:11:31 +0200

Title: Re: True-False vs True-Error
At 10:04 AM -0500 10/12/08, Luther Fuller wrote:
Something I noticed while commenting on "Detecting Applescript and SKYPE" ...

The Finder's 'exists' command is defined in the Finder's dictionary as having a Boolean result.
To quote: "Å® boolean : true if it exists, false if not"

But this code does not have that behavior ...

       tell application "Finder"
               exists application file id "com.unknown.something"
        end tell

It does return true if it exists, but returns error -10814 if it does not exist.
A boolean result should return true or false, not true or error.
Easily fixed with a try block, but why should that be necessary?
Is there a bug hiding here?

Tricky command to document ... it's like, you could write:

exists alias ("non-existing" & "calculated path")

and get an error, because AppleScript did not even make it to the "exists" command, it failed before.

Emmanuel
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References: 
 >True-False vs True-Error (From: Luther Fuller <email@hidden>)

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