Thank you for your feed back but I still can not get it to work. I am kind of a nubie when it comes to Perl. The function that reads in is actually called ReadInputs not SetOutputs but I guess that was just a typo.

I have pasted the code I am trying to get to work below. The code is suppost to print out what ReadInputs has read every second. The error that I am getting in command prompt is "Not a Code reference at line 20" and it's talking about "my $rv = $read_inputs->($buf);" 

use strict;
use Win32::API;

Win32::API->Import("wsp", "int InitWasp()");
my $read_inputs = Win32::API->new("wsp", "ReadInputs", "P", "I");

InitWasp(); #connect to WASP USB board

#constant input read in
#
while(1){
    print ReadInputs()."\n";
    sleep(1);
}

#Subroutines
#
sub ReadInputs{
    my $buf = "\x00" x (4 * 32/8);
    my $rv = $read_inputs->($buf);
    return ($rv, unpack('l4', $buf));
}

[download]

In reply to Re^2: Win32::API cant define function by BarneySimpson
in thread Win32::API cant define function by BarneySimpson

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.