Debenu Quick PDF Library - PDF SDK Community Forum : png image rendred was empty http://www.quickpdf.org/forum/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sat, 04 Apr 2026 06:56:52 +0000 Mon, 20 Feb 2017 18:27:02 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.01 360 www.quickpdf.org/forum/RSS_post_feed.asp?TID=3439 <![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[png image rendred was empty : Mmmmmh...In your code snippet...]]> http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13687.html#13687 Author: Ingo
Subject: 3439
Posted: 20 Feb 17 at 6:27PM

Mmmmmh...
In your code snippet i can't find the unlock-function?

]]> Mon, 20 Feb 2017 18:27:02 +0000 http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13687.html#13687 <![CDATA[png image rendred was empty : I have already used another method...]]> http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13686.html#13686 Author: Edysoft
Subject: 3439
Posted: 20 Feb 17 at 1:28PM

I have already used another method than "DARenderPageToFile"(RenderDocumentToFile) but it does not work because it generate an empty image]]> Mon, 20 Feb 2017 13:28:56 +0000 http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13686.html#13686 <![CDATA[png image rendred was empty : I successfully converted this...]]> http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13685.html#13685 Author: tfrost
Subject: 3439
Posted: 20 Feb 17 at 11:19AM

I successfully converted this PDF file to image using our application, but (a) we convert to BMP, and (b) we no longer use the DA functions (which had some rendering issues with PDFium in the latest build, though we no longer use the Debenu PDFium DLL), and (c) we use Delphi, not .Net.  But this confirms to me that there is nothing unusual or 'difficult' about your PDF file. I also tried to convert to PNG using Debenu PDF Tools Pro v3, but this was a 2014 version so based on a much earlier QPDF library: it crashed, but that has happened before.

I recommend trying the non-DA API functions to see if that helps.  As I said, there are some differences in rendering between the two function sets in the latest release.  If it works without DA but the DA functions are essential for you, then raise a support issue.
]]> Mon, 20 Feb 2017 11:19:39 +0000 http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13685.html#13685 <![CDATA[png image rendred was empty : Edysoft wrote:thank you IngoI...]]> http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13684.html#13684 Author: Edysoft
Subject: 3439
Posted: 20 Feb 17 at 9:39AM

Originally posted by Edysoft Edysoft wrote:

thank you Ingo
I shared the pdf and the generated image in google drive
https://drive.google.com/open?id=0B7zZhKfGfiFNWnBUa3RYTENybms



I even tested with the new version and I had the same problem
]]> Mon, 20 Feb 2017 09:39:37 +0000 http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13684.html#13684 <![CDATA[png image rendred was empty : think you IngoI shared the pdf...]]> http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13683.html#13683 Author: Edysoft
Subject: 3439
Posted: 20 Feb 17 at 9:01AM

think you Ingo
I shared the pdf and the generated image in google drive
https://drive.google.com/open?id=0B7zZhKfGfiFNWnBUa3RYTENybms

]]> Mon, 20 Feb 2017 09:01:06 +0000 http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13683.html#13683 <![CDATA[png image rendred was empty : The strange download site is not...]]> http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13681.html#13681 Author: Ingo
Subject: 3439
Posted: 15 Feb 17 at 7:27PM

The strange download site is not particularly trusting.
I don't wanna have few unknown things on my harddisk after using this site :(

]]> Wed, 15 Feb 2017 19:27:02 +0000 http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13681.html#13681 <![CDATA[png image rendred was empty : @Ingo: Yes they look like using...]]> http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13675.html#13675 Author: Edysoft
Subject: 3439
Posted: 14 Feb 17 at 7:48AM

@Ingo: Yes they look like using chrome browser. You can download files as zip and you will see the difference]]> Tue, 14 Feb 2017 07:48:38 +0000 http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13675.html#13675 <![CDATA[png image rendred was empty : png and pdf-page are looking the...]]> http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13674.html#13674 Author: Ingo
Subject: 3439
Posted: 13 Feb 17 at 7:32PM

png and pdf-page are looking the same for me (using Chrome)?

Cheers and welcome here,
Ingo

]]> Mon, 13 Feb 2017 19:32:52 +0000 http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13674.html#13674 <![CDATA[png image rendred was empty : I using this method to getfile...]]> http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13673.html#13673 Author: Edysoft
Subject: 3439
Posted: 13 Feb 17 at 2:46PM

I using this method to get filehandle 
 QuickPDFNet.PDFLibrary.Instance.DAOpenFileReadOnly( pdfFileFullPath, password );
and for the other parmameter pagehandle

 int pagehandle = QuickPDFNet.PDFLibrary.Instance.DAFindPage( fileHandle, pageNumber );

int result = QuickPDFNet.PDFLibrary.Instance.DARenderPageToFile
( fileHandle
, pagehandle
, GetPageRenderQuickPDFImageFormat( renderImageFormat )
, dpi
, imageFile.FullName
);

switch( result )
{
case 0: //Wrong file handle or page handle
{
throw new ArgumentException( "Invalid page number or pdf file specified !" );
}
case 1:
{
return imageFile;
}
case 2: //Cannot save to disk
{
throw new IOException( string.Concat( "Cannot save the page image rendering to ", pdfPageRenderImageFile, " !" ) );
}
default : 
{
throw new Exception( string.Concat( "Unknow quickpdf return code : ", result ) );
}
]]> Mon, 13 Feb 2017 14:46:57 +0000 http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13673.html#13673 <![CDATA[png image rendred was empty : You should show your actual code...]]> http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13672.html#13672 Author: tfrost
Subject: 3439
Posted: 13 Feb 17 at 2:12PM

You should show your actual code to enable people to see how you obtained the filehandle and pageref parameters: the actual values are of no help.  Then I expect someone will be able to suggest something to try.]]> Mon, 13 Feb 2017 14:12:06 +0000 http://www.quickpdf.org/forum/png-image-rendred-was-empty_topic3439_post13672.html#13672