General Discussion - general question 32 bit apps and 32/64 bit dlls

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general question 32 bit apps and 32/64 bit dlls

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Category: For Users of the Library
Forum Name: General Discussion
Forum Description: Discussion board for Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=814
Printed Date: 29 Sep 24 at 4:40AM
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Topic: general question 32 bit apps and 32/64 bit dlls

Posted By: Ingo
Subject: general question 32 bit apps and 32/64 bit dlls
Date Posted: 21 Nov 07 at 2:20AM

Hello!

I've made the experience that dlls generated under 32 bit / winxp doesn't work on vista 64 bit systems ;-)
'Cause actually i don't have a running 64 bit system ... Is it possible to run a 32 bit dll on vista 64 bit if the dll-functions are called from a 32 bit gui application?

Thanks in advance for telling me your experiences.

Best regards,
Ingo

Replies:

Posted By: mrgcms
Date Posted: 21 Nov 07 at 12:12PM

32 bit DLLs should be callable from 32 bit processes without problem. However, as far as I know, there is no thunking layer between 64 bit processes and 32 bit DLLs like there was between 32 bit processes and 16 bit DLLs in previous versions of Windows.

I do have a Windows XP 64 bit system if you want something tested.

Posted By: Ingo
Date Posted: 21 Nov 07 at 4:20PM

Hi Dave!

Thanks for your offer.
I've sent an email to you.

Best regards,
Ingo

Posted By: mrgcms
Date Posted: 21 Nov 07 at 11:56PM

Application appears tp run without problems on Win XP Pro x64 - installed under the "program Files (x86)" directory.