in reply to Importing constants into another module

The code we're interested in is actually in Audit::Config. Specifically, look at Exporter - you use Exporter in your exporting module (makes sense), set up an @EXPORT array (I use "our @EXPORT = ...", but that's because I never use an older version of perl where our doesn't exist), and Bob's yer uncle. All other modules that "use Audit::Config;" will automatically get the exported constants.

I doubt it's making your module OO that made this stop working - it's probably the use strict ;-)

  • Comment on Re: Importing constants into another module

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Re^2: Importing constants into another module
by paulski (Beadle) on Feb 03, 2005 at 01:35 UTC
    I thought it was something to do with Exporter before I posted but my attempts to export the constants didn't work. Here's what I've tried:

    Audit::Config.pm: 

    package Config;
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(HOSTS_FILE HOST_BIN);

use constant HOSTS_FILE => '/home/csssec/audit/css_hosts.txt';

use constant HOST_BIN => '/usr/bin/host';

...

1;

    [download]
    Check::DNSCheck.pm 
    
package DNSCheck;

use Audit::Config;
use strict;

sub new
{
        my $class = shift;
        my $host = shift;

        my $this =
        {
                host   => $host,
        };
        bless ($this, $class);

}

sub run
{

        my $this = shift;

        my $cmd = HOST_BIN . " $this->{'host'} 2>/dev/null";

        my $r = `$cmd`;
        if ($r !~ /has address/)
        {
                return(0);
        }

        return(1);

}

1;

    [download]
    I still get the same error message: 
    Bareword "HOST_BIN" not allowed while "strict subs" in use at Check/DN
+SCheck.pm line 24.
Compilation failed in require at ./audit.pl line 6.
BEGIN failed--compilation aborted at ./audit.pl line 6.

    [download]
    I'm sure it's something to do with exporting the constants but as far as I can see, I'm doing it all according to the man page.

    Any ideas?

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      You need to use the right namespace in your module. In Audit::Config, make the following change: 
      # package Config;
package Audit::Config;

      [download]
[reply]
[d/l]
        Hehe...I'd figured this out just before you posted. Although I was going mainly off intuition.

        Why was this causing the problem.?

        Is is because Audit::Config.pm clashes with another PERL module called Config.pm in @INC?

        Another weird thing...if I set the package for DNSCheck.pm as:

        package Check::DNSCheck.pm

        my script complains that it can't find the new{} constructor.

        Can't locate object method "new" via package "DNSCheck" (perhaps you forgot to load "DNSCheck"?) at ./audit.pl line 32, <FILE> line 1.

        I'd be interested to know why this is?

        Thanks

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