Re: [MacPerl] Determining free disk space

["Ian" <ian@aotearoa.demon.co.uk>]

Thanks for these replies, when I get the chance (suddenly I'm a bit snowed
under) I'll have a look into the solutions people have offered and - if I'm
successful - post a followup.

Ian

----------
>From: Chris Nandor <pudge@pobox.com>
>To: "Jefferson R. Lowrey" <lowrey@mailbag.com>
>Subject: Re: [MacPerl] Determining free disk space
>Date: Mon, Oct 11, 1999, 4:40 pm
>

> At 8:55 -0500 1999.10.11, Jefferson R. Lowrey wrote:
>>At 10:34 AM +0200 10/11/99, Ian wrote:
>>>Hi
>>>
>>>I've had a look at CPAN, the FAQ, and searched the mailing list archive, but
>>>with no joy. I'd like to write a simple script that runs as a cron job and
>>>checks the space remaining on all the volumes on our server...if there's
>>>less than a certain amount of space on one of the volumes it'll email the
>>>sysadmin with the details.
>>>
>>>However, I can't find a way of finding out how much free space there is on a
>>>mounted (or local) volume. There are a couple of Unix modules for this, but
>>>evidently not for the Mac. Any clues?
>>>
>>
>>Well.  This sounds like a job for glue...
>>use strict;
>>use Mac::Glue ':all';
>>my $finder = new Mac::Glue 'Finder';
>>
>>my $freespace = $finder->get($finder->prop('free_space',disk => 'Jeff-HD'));
>>
>>print "$freespace\n";
>>__END__
>>
>>But I'm not getting quite the result I'm looking for.  It sends the same AE
>>as the corresponding AppleScript (another option)
>>tell application "Finder"
>>   get free space of disk "Jeff-HD"
>>end tell
>>
>>but I get a result like
>>comp(«0000000017402000»)
>>
>>So I don't think I'm coercing things right or using the right terminology
>>somewhere.
>
> There are two ways around it.
>
> One is to add this code:
>
>     local $Mac::AppleEvents::Simple::AE_GET{comp} = sub {
>         (unpack 'll', shift()->data->get)[-1]
>     };
>
> This will unpack the double integer (which is what 'comp' stands for, I
> believe).  I can add this code to a future version of the module or
> something.
>
> The other way is to ask for a double float:
>
>     printf $finder->get(
>         $finder->prop(free_space => disk => 'Bird'),
>         as => 'doub'
>     );
>
> You can also do:
>
>     $Mac::Types::MacUnpack{comp} = sub {
>         (&Mac::Types::_Unpacker('ll')->(@_))[-1];
>     };
>
> Note that we take the last argument of the list returned by the two
> unpacking routines.  I guess you should really concatenate the two values:
>
>     join '', unpack 'll' ... ;
>
> Would that be correct?  But if you did that, you could not use the
> resulting number for math operations (unless the first number is 0, which
> it will be in most cases).
>
> --
> Chris Nandor          mailto:pudge@pobox.com         http://pudge.net/
> %PGPKey = ('B76E72AD', [1024, '0824090B CE73CA10  1FF77F13 8180B6B6'])

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