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Re: AS and Gestalt
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Re: AS and Gestalt


  • Subject: Re: AS and Gestalt
  • From: Phi Sanders <email@hidden>
  • Date: Fri, 22 Dec 2000 18:51:01 -0500

Thanks, Chris!!

~Phi
--
Phi Sanders

"Phee, Phi, Pho, Phum..."

On 12/22/00, Chris Nebel {email@hidden} said the following :

>Carl West wrote:
>
>> Christopher Nebel wrote:
>> >...
>> > Alternatively, you can use the Finder's "computer" verb, but you have to
>> > know the Gestalt codes and how to interpret the results.
>>
>> I'm short some clues here.
>>
>> The phrase 'use the Finder's "computer" verb' isn't getting me very far,
>> The only thing I tried that worked was:
>>
>> tell app "Finder"
>> set foo to computer name
>> end tell
>>
>> but how I get to Gestalt from here is a mystery, getting to the
>> appropriate selector is a mystery, and interpreting the results is a
>mystery.
>>
>> I seem to be missing some underlying concepts for dealing with
>> AppleScript and don't know where to find them.
>>
>> Is there some way I can ask the Finder's "computer" verb how to use it?
>> ask it what properties it has?
>
>Another shining example of dictionary design strikes again. The Finder's
>"computer" verb is a very, very thin veneer on the native Gestalt API.
>In order
>to use it, you have to know the Gestalt selector codes and what all the
>results
>mean. This information is unfortunately not available via AppleScript
>itself --
>you have to read the Gestalt documentation. (By the way, despite
appearances,
>"computer name" has no relation whatsoever to "computer". It's actually
>a verb
>defined in the FileSharing Commands scripting addition.)
>
>So, Gestalt documentation: for starters, read
><http://developer.apple.com/techpubs/mac/OSUtilities/OSUtilities-13.html>
>for a
>list of constants and what the responses are. Unfortunately, that page
>has two
>problems: first, it only gives you the C/Pascal constant names, not the
>four-character codes you need for "computer", and second, it only lists the
>older selectors.
>
>You can cure the first problem by reading
><http://developer.apple.com/techpubs/mac/OSUtilities/OSUtilities-27.html>
>-- it
>has the same information as the first, but is less readable. To cure the
>second, you'll need a copy of Gestalt.h. It's included with the Carbon SDK
><ftp://ftp.apple.com/developer/Development_Kits/CarbonLib_1.0.4_SDK.sit.hqx>,
>but that's about a 7MB download, so I've put a copy of Gestalt.h on my iDisk
><http://hompage.mac.com/c.nebel> -- it's a relatively svelte 88K.
>
>Now that you've got all that, how about an example? Say you want to know how
>fast the Mac is you're running on. Browsing through Gestalt.h, we find that
>there's a selector gestaltProcClkSpeed = FOUR_CHAR_CODE('pclk'). We use the
>four-character code as a string, so in AppleScript, that's:
>
> tell application "Finder"
> computer "pclk"
> end
>
>On my machine, it responds with 500000000, or 500MHz. (Woohoo!) I hope that
>clears things up a bit.
>
>
>--Chris Nebel
>AppleScript Engineering
>_______________________________________________
>applescript-users mailing list
>email@hidden
>http://www.lists.apple.com/mailman/listinfo/applescript-users


References: 
 >Re: AS and Gestalt (From: Chris Nebel <email@hidden>)

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