The easiest way is to use an anonymous subroutine to call your method: 
# i'm assuming $self is actually defined here somewhere...
    my $twig = new XML::Twig(
        twig_handlers => {
            _all_ => sub { $self->proc_list(@_) },
        },
    );

[download]

addendum:

$ele is always empty inside proc_list.
That's because in your code you're not passing the proc_list method, you're passing the result of calling $self->proc_list; which 1) is called before the XML::Twig object is even constructed, and 2) does not pass any arguments beside $self to proc_list.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re: Mixing handlers with methods by Joost
in thread Mixing handlers with methods by shamu

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • 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:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.