I have a COM object that exposes the following method:
GetErrorStr(DWORD errCode, VARIANT* errStr)
The IDL is as follows: [id(8), helpstring("method GetErrorStr")] HRESULT GetErrorStr([in] DWORD errCode, [out] VARIANT* errStr); The method accepts a DWORD parameter, looks up an error text string and returns it via errStr. I can call the method via IDispatch from VBScript w/o problem. But when calling this method from perl, the errStr is not returned to the perl program. My perl code follows: 

use strict;
use Win32::OLE;
use Win32::OLE::Variant;

    my $obj = Win32::OLE->new('PDH.PDHQuery');
    print("Failed to create connection to PDHQUERY object\n") if (not 
+$obj);

    my $errstr = Variant(VT_BSTR|VT_BYREF, Variant(VT_EMPTY));
    $obj->GetErrorStr( Variant(VT_I4|VT_BYREF, 12345), $errstr );

[download]
many thanks

20031126 Edit by Corion: Fixed formatting

In reply to in/out Win32:Ole strings by RonJames

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.