comment on

I will attempt to explain how to put some generally useful function into a "module" so that you can call it from other programs.

Best way, is by example:
Make a file called TEST_GIZMO.pm and stick this code into it:

#!/usr/bin/perl -w
use strict;

package TEST_GIZMO;

use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS $VERSION);
use Exporter;
our $VERSION=1.00;
our @ISA = qw(Exporter);
our @EXPORT = qw(test1 test2);
our @EXPORT_OK = qw(); #some avanced stuff but it is possible
                       #to only export a subset of functions by
                       #default and allow others to be imported
                       #"by request".

sub test1
{
   print "test1 in TEST GIZMO worked!\n";
}

sub test2
{
   print "test2 in TEST GIZMO worked!\n";
}

1;  ### this is obscure stuff, but you need this line !!!!
    ### by default Perl returns the value of the last line in a
    ### sub or package. In this case, it means that this package
    ### inclusion "worked". In the C world or command line,
    ### shell world, 0, zero means "it worked", non-zero is
    ### an error code, but not in THIS case of Perl. "1" is the
    ### right return value here! Any way trust me, you need a 
    ### 1 return value at the end of a .pm module.
[download]

Now make a file called test_module.pl and stick this code into it:

#!/usr/bin/perl -w
use strict;

use TEST_GIZMO;

test1;
test2;
TEST_GIZMO::test1; #this is "fully qualified name", a way to
                   #invoke test1 even if that name wasn't 
                   #explicitly exported.
[download]

When you run test_module.pl, you should see:
test1 in TEST GIZMO worked!
test2 in TEST GIZMO worked!
test1 in TEST GIZMO worked!

I hope that this is enough "boiler plate" for you to create your own library functions. There is of course a lot to this subject, but I hope I got you started!

In reply to Re: Calling Subroutines of package from another program? by Marshall
in thread Calling Subroutines of package from another program? by anbutechie

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		`&`
	<		`<`
	>		`>`
	[		`[`
	]		`]`

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.