If you are going to use IO::Dir::pl->new you need to have defined IO::Dir::pl before you used it.

I.e. you can't just take a random class name and use it as an object or perl will complain:

 perl -we'use strict; my $foo=Data::Vars->new();'
Can't locate object method "new" via package "Data::Vars" (perhaps you
+ forgot to load "Data::Vars"?) at -e line 1.
> grep 'sub.*new' lib/Data/Vars.pm
        sub new (;$) {    # return blessed objects and init pre-define
+d fields w/args
[download]

you have to "use" (or have it defined first) a class (so perl can know where to attach things) BEFORE you use it.

That's the 1st problem.

Second problem is -- what are you trying to do?

Your first routine calls IO::DIR::pl->new, but I don't see any 'new' in IO::dir::pl.

You *can't rely* on inheritance yet, as you don't have a Blessed Object!

Third problem is you call "read_pl", in your class, but have no read_pl. (did you mean read?) So if you fix those, things, it works, but not well:

#!/usr/bin/perl -w

use strict;
use warnings;
use IO::Dir;
my $dh=bless {}, 'IO::Dir::pl';
#my $dh = IO::Dir::pl->new('.');
while (my $file_name = $dh->read()){
    print STDOUT "$file_name\n";
    exit;
}


{
  package IO::Dir::pl;
  use strict; use warnings;
  our @ISA;
  @ISA = qw(IO::Dir);

  sub read{
    my $self = shift;
    warn "Ok We got here.\n";
    return undef;
  }
}

> /tmp/p
Ok We got here.
        (in cleanup) Not a GLOB reference at /usr/lib/perl5/5.16.2/x86
+_64-linux-thread-multi/IO/Dir.pm line 43.
[download]

If you Just switch around things so your definition occurs before you use it:

#!/usr/bin/perl -w

{
  package IO::Dir::pl;
  use strict; use warnings;
  our @ISA;
  @ISA = qw(IO::Dir);

  sub read{
    my $self = shift;
    warn "Ok We got here.\n";
    return undef;
  }
}

use strict;
use warnings;
use IO::Dir;
my $dh = IO::Dir::pl->new('.');
while (my $file_name = $dh->read()){
    print STDOUT "$file_name\n";
    exit;
}

> /tmp/p
Ok We got here.
[download]

That does what you want...

(I think?)

---

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