Debenu Quick PDF Library - PDF SDK Community Forum : Using QuickPDF in Multi-Thread app http://www.quickpdf.org/forum/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Wed, 15 Jul 2026 23:03:23 +0000 Mon, 05 Jul 2021 22:51:50 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.01 360 www.quickpdf.org/forum/RSS_post_feed.asp?TID=3931 <![CDATA[Debenu Quick PDF Library - PDF SDK Community Forum]]> http://www.quickpdf.org/forum/forum_images/QPDF_Forum_Title.png http://www.quickpdf.org/forum/ <![CDATA[Using QuickPDF in Multi-Thread app : Hi,i&#039;ve made a complete scan...]]> http://www.quickpdf.org/forum/using-quickpdf-in-multithread-app_topic3931_post15809.html#15809 Author: Ingo
Subject: 3931
Posted: 05 Jul 21 at 10:51PM

Hi,

i've made a complete scan through all source elements of version 18.11 ...
There isn't a single Synchronize... Nothing.
CoInitialize i've found - but i didn't found UnCoInitialize.
 



Edited by Ingo - 05 Jul 21 at 10:54PM]]> Mon, 05 Jul 2021 22:51:50 +0000 http://www.quickpdf.org/forum/using-quickpdf-in-multithread-app_topic3931_post15809.html#15809 <![CDATA[Using QuickPDF in Multi-Thread app : Hi Ingo, Yes, I researched this...]]> http://www.quickpdf.org/forum/using-quickpdf-in-multithread-app_topic3931_post15806.html#15806 Author: RedOctober2018
Subject: 3931
Posted: 04 Jul 21 at 11:22PM

Hi Ingo, Yes,  I researched this problem and found CoInitialize and CoUnitialize, but no matter where I call these in relation to the call to create a QuickPDFLibrary object, I get an error message.  I suspect there is a call to CheckSynchronize inside the QuickPDFLibrary which means it always needs to be in the main thread.  But it can't be, because I'm using QPDF Lib in the non-main thread.

CoInitialize must be called within the non-main thread.  UnCoInitialize must not be called in the non-main thread, it must be called in the main thread.

That's why I just asked the open ended question  "what is the correct way to do this" which usually elicits a broader and more complete answer than asking a more narrowly focused question.
]]> Sun, 04 Jul 2021 23:22:00 +0000 http://www.quickpdf.org/forum/using-quickpdf-in-multithread-app_topic3931_post15806.html#15806 <![CDATA[Using QuickPDF in Multi-Thread app : Hi,think this haven&#039;t to...]]> http://www.quickpdf.org/forum/using-quickpdf-in-multithread-app_topic3931_post15805.html#15805 Author: Ingo
Subject: 3931
Posted: 04 Jul 21 at 10:50PM

Hi,

think this haven't to do with QuickPDF itself.
Try Google with CheckSynchronize...
Think you'll get the solution of your issue in the www ;-)



Edited by Ingo - 04 Jul 21 at 10:51PM]]> Sun, 04 Jul 2021 22:50:55 +0000 http://www.quickpdf.org/forum/using-quickpdf-in-multithread-app_topic3931_post15805.html#15805 <![CDATA[Using QuickPDF in Multi-Thread app : Platform: Windows 2016 Server...]]> http://www.quickpdf.org/forum/using-quickpdf-in-multithread-app_topic3931_post15804.html#15804 Author: RedOctober2018
Subject: 3931
Posted: 04 Jul 21 at 10:45PM

Platform: Windows 2016 Server  Lazarus 2.0.10, FreePascal 3.2.0
Web App:  Brook 5 Framework  QuickPDF Library 10.13
Uses clause contains:  ComObj, ActiveX,  DebenuPDFLibrary64AX1013_10_13_TLB;                           

I need use the QuickPDF library in a non-main thread of my web app.  However, when I run the code to create a library object:

...
var
   qpdfDCL: TAxcPDFLibrary;
begin
    qpdfDCL := TAxcPDFLibrary.Create(frmMain);
...


I always get this error message:
  CheckSynchronize called from non-main thread

What is the correct, thread-safe way, to .Create, use and .Free, the QuickPDFLibrary in a non-main thread?

Thanks in advance.


]]> Sun, 04 Jul 2021 22:45:10 +0000 http://www.quickpdf.org/forum/using-quickpdf-in-multithread-app_topic3931_post15804.html#15804