Debenu Quick PDF Library - PDF SDK Community Forum : Problem with RenderPageToStream http://www.quickpdf.org/forum/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Fri, 01 May 2026 03:41:10 +0000 Mon, 06 Apr 2020 07:16:38 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.01 360 www.quickpdf.org/forum/RSS_post_feed.asp?TID=3800 <![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[Problem with RenderPageToStream : I solved the problem using DPLR...]]> http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15184.html#15184 Author: aderg
Subject: 3800
Posted: 06 Apr 20 at 7:16AM

I solved the problem using DPLR renderer and RenderPageToDC
]]> Mon, 06 Apr 2020 07:16:38 +0000 http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15184.html#15184 <![CDATA[Problem with RenderPageToStream : This won&#039;t work:procedure...]]> http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15183.html#15183 Author: Ingo
Subject: 3800
Posted: 05 Apr 20 at 10:23PM

This won't work:

procedure TfrmMain.btOpenClick(Sender: TObject);
begin
  if OpenDialog1.Execute(Handle) then
  begin
    LoadPDF(OpenDialog1.FileName);
    LoadPDF2(OpenDialog1.FileName);
  end;
end;

Please don't forget that this is a user-forum - not a helping forum from the publishers ;-)

]]> Sun, 05 Apr 2020 22:23:00 +0000 http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15183.html#15183 <![CDATA[Problem with RenderPageToStream : I used the information from here...]]> http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15182.html#15182 Author: aderg
Subject: 3800
Posted: 04 Apr 20 at 12:23AM

I used the information from here  http://www.debenu.com/kb/is-debenu-pdf-library-thread-safe/
"Debenu Quick PDF Library can be used in a multi-threaded environment so long as a separate instance of the library is created by each thread"
 
I developed a test application. In the background stream, previews are created, but some images on the pages are sometimes skipped. Screenshot here http://yadi.sk/i/JdZlZ5-4gd341g

You can look at the source code, maybe you can tell me something
Sources http://drive.google.com/open?id=1RAckSmQwniH74_bIt5N9UKvLJaF_yTbF
Exe http://drive.google.com/open?id=1OyT2JuPZEk6LCT1hzkXKZAOSKX-u-3_5
Test PDF http://drive.google.com/open?id=1j8ucL17jilagtqwJbc393x1RD6Gz1reH
]]> Sat, 04 Apr 2020 00:23:32 +0000 http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15182.html#15182 <![CDATA[Problem with RenderPageToStream : tfrost wrote:If you suspect...]]> http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15181.html#15181 Author: aderg
Subject: 3800
Posted: 04 Apr 20 at 12:06AM

Originally posted by tfrost tfrost wrote:

If you suspect a threading issue it might be worth running Sysinternals Process Monitor and filtering on some of your image files that fail to show.  It would indicate any failure to open a file and tell you whether the reason was a sharing violation.

The problem is not with different files, but with different pages of the same file. And only when using the background thread, if you do in the main thread, it is ok
]]> Sat, 04 Apr 2020 00:06:17 +0000 http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15181.html#15181 <![CDATA[Problem with RenderPageToStream : I find QPDF to be thread-safe...]]> http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15180.html#15180 Author: tfrost
Subject: 3800
Posted: 03 Apr 20 at 5:46PM

I find QPDF to be thread-safe for our purposes (rendering PDFs to bitmap).  It's the optional PDFIUM DLL that is more likely to fail with multiple threads.

If you suspect a threading issue it might be worth running Sysinternals Process Monitor and filtering on some of your image files that fail to show.  It would indicate any failure to open a file and tell you whether the reason was a sharing violation.
]]> Fri, 03 Apr 2020 17:46:05 +0000 http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15180.html#15180 <![CDATA[Problem with RenderPageToStream : ...wasn&#039;t really threadsave......]]> http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15179.html#15179 Author: Ingo
Subject: 3800
Posted: 03 Apr 20 at 4:28PM

...wasn't really threadsave...

]]> Fri, 03 Apr 2020 16:28:38 +0000 http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15179.html#15179 <![CDATA[Problem with RenderPageToStream : I tried making a copy of the file...]]> http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15178.html#15178 Author: aderg
Subject: 3800
Posted: 03 Apr 20 at 12:23PM

I tried making a copy of the file using SaveToStream/LoadFromStream - same problem.. ((
]]> Fri, 03 Apr 2020 12:23:17 +0000 http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15178.html#15178 <![CDATA[Problem with RenderPageToStream : Yes, both objects point to the...]]> http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15177.html#15177 Author: aderg
Subject: 3800
Posted: 03 Apr 20 at 11:38AM

Yes, both objects point to the same file. Thanks, I'll try to make a copy of the file]]> Fri, 03 Apr 2020 11:38:09 +0000 http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15177.html#15177 <![CDATA[Problem with RenderPageToStream : Hi,but both objects points to...]]> http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15176.html#15176 Author: Ingo
Subject: 3800
Posted: 03 Apr 20 at 11:21AM

Hi,

but both objects points to the same file?
I don't have much experiences regarding issues like this but as far as i know at least in the past QuickPDF wasn't really threadsave?
Perhaps someone other can advice you a bit deeper...

But anyway... Cheers and welcome here for now,
Ingo

]]> Fri, 03 Apr 2020 11:21:11 +0000 http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15176.html#15176 <![CDATA[Problem with RenderPageToStream : I use RenderPageToStream in the...]]> http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15175.html#15175 Author: aderg
Subject: 3800
Posted: 03 Apr 20 at 11:00AM

I use RenderPageToStream in the background thread to create page preview. A separate object TQuickPDF is created in the thread.  But if there are several pictures on the page, sometimes not all pictures are displayed. How can this problem be solved?
Screenshot is here http://yadi.sk/i/vfupmnvn8wp2Kw
]]> Fri, 03 Apr 2020 11:00:01 +0000 http://www.quickpdf.org/forum/problem-with-renderpagetostream_topic3800_post15175.html#15175