FrankHaas has asked for the wisdom of the Perl Monks concerning the following question:

Greetings Monks,

I'm trying to use Storable under Win XP with ActiveState Perl 5.8.8. I'm getting an error which says:

D:\Frank\tdump>perl p1.pl
Cannot restore overloading on SCALAR(0x1c0d3b0) (package PDL) (even af
+ter a "require PDL;") at ..\..\lib\Storable.pm (autosplit into ..\..\
+lib\auto\Storable\_retrieve.al) line 380, at p1access.pm line 53

[download]

I've reinstalled PDL 2.4.3 but that didn't help. My user code where it fails is this function:


sub my_retrieve {
    my $File = $_[0];
    my $arrayref = retrieve("$File");

    return @{$arrayref};    
}

[download]

What am I doing wrong here?

Thanks in advance!

Regards

Frank

Replies are listed 'Best First'.
Re: Storable under Win XP?
by Corion (Patriarch) on Jan 08, 2008 at 15:23 UTC

    I'm not sure whether you can store any PDL object via Storable at all - PDL has many parts written in XS (that is, C), which are invisible to Storable, and unless the PDL modules implement the appropriate Storable hooks, those C parts will remain invisible to Storable.

    But then, I've never used PDL and not much of Storable, so it might be that the two are supposed to work together.

    A different approach might be to use Data::Dumper instead, but that one will make the size of your data grow very large while dumping it.

[reply]
      Thanks,

      just realized I wasn't clear enough - I don't want to use PDL, just Storable but it looks as if Storable requires PDL, i.e. when I remove PDL and try it again I'm getting:

      D:\Frank\tdump>perl p1.pl
Can't locate PDL.pm in @INC (@INC contains: C:/Perl/site/lib C:/Perl/l
+ib .) at ..\..\lib\Storable.pm (autosplit into ..\..\lib\auto\Storabl
+e\_retrieve.al) line
380.
BEGIN failed--compilation aborted, at p1access.pm line 60

      [download]

      Thanks again!

      Regards

      Frank

[reply]
[d/l]
        No... I think the file you're trying to load using Storable requires PDL. Storable works fine without PDL all by itself.

        Try to save a data structure you created yourself, first, and load that.

[reply]
Re: Storable under Win XP?
by moklevat (Priest) on Jan 08, 2008 at 16:04 UTC
    There are a couple of modules designed to help with this, but unfortunately neither seems to be available as a ppm for ActiveState under Win32 (assuming you are using ActiveState).

    Both PDL::IO::Storable and PDL::NetCDF could help accomplish your aims. Though according to the docs for PDL::IO::Storable, if you plan to use the stored piddles across platforms, you may be better off using PDL::NetCDF. Initially, it looked like an ActivePerl ppm for PDL::NetCDF was available from Randy Kobe's ppm repository, but the link to NetCDF on that page goes nowhere. From Trouchelle it looks like the 0.93 build failed.

    So, I guess this is helpful only if you can build your own.

[reply]
      Would using CPAN on Windows help out any there?

      I had forgotten, but you can use "perl -MCPAN -e shell" on Windows and add/configure modules.

[reply]

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