You create dthe API object but you need to return a result from a call to that object. Note I do not have the dll in question so I can not test but I would think your code should look like this: 

use Win32::API;

my $filename="C:/Windows/ieuninst.exe";
my $Api = new Win32::API("fileversion.dll", "GetFileVersionTxt", P, P)
+;

# Set some memory aside for the returned value
my $output = "\x00" x 1024;

# Call the function in the dll
$Api->Call($filename,$output);

# Remove the unused padding in the string

my $final = ($output =~ /(.*?)\x00/);
print "\output - $final";

[download]

This is from an example in Chapter 9 of Win32 API from Win32 Perl Programming by David Roth modified to match your criteria. I would like to play with dll to test this as I think it would need some tweaking to run. I also suggest reading the pod for Win32::API as they have some excellent examples of getting data in and out of the functions loaded.

"No matter where you go, there you are." BB

In reply to Re: Win32::API question by Ninthwave
in thread Win32::API question by Anonymous Monk

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.