Memory Leak in DebenuPDFLibrary?

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Hello good people, 
I have a pdf file with 200 pages or more.
I'm extracting/rendering each page as a TIFF file.
The problema is when using the code below the heap memory just gets bigger and bigger and eventually throws an out of memory exception.

---- sample code---
PdfLib.LoadFromFile(filename, null);
var documentId = PdfLib.SelectedDocument();
var pageCount = PdfLib.PageCount();
for(int i=0;i<pageCount;i++)
{
 PdfLib.SelectPage(i);

 var tempFileName="....."; // custom filename

 // 7 = TIFF (LZW) output
 PdfLib.RenderPageToFile(300, i, 7, tempFileName);
}
-----

each time the RenderPageToFile is called the memory increases 2MB and i dont know of a way to release it other than unload the document and reload it again (for each x pages for example) wich is not a very elegante way of doing this.

What i'm i missing? Is it a bug? or my pseudo-code is wrong?

Im using the 32bit dll .net version and c# with DebenuPDFLibraryDLL1014 but i've tried with the latest version and the behaviour is exactly the same.

any help?

Edited by rmbarbosa - 05 Aug 16 at 3:58AM

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rmbarbosa Members Profile Find Members Posts Beginner Joined: 05 Aug 16 Status: Offline Points: 2	Post Options Post Reply Quote rmbarbosa Report Post Thanks(0) Quote Reply Topic: Memory Leak in DebenuPDFLibrary? Posted: 05 Aug 16 at 3:53AM
	Hello good people, I have a pdf file with 200 pages or more. I'm extracting/rendering each page as a TIFF file. The problema is when using the code below the heap memory just gets bigger and bigger and eventually throws an out of memory exception. ---- sample code--- PdfLib.LoadFromFile(filename, null); var documentId = PdfLib.SelectedDocument(); var pageCount = PdfLib.PageCount(); for(int i=0;i<pageCount;i++) { PdfLib.SelectPage(i); var tempFileName="....."; // custom filename // 7 = TIFF (LZW) output PdfLib.RenderPageToFile(300, i, 7, tempFileName); } ----- each time the RenderPageToFile is called the memory increases 2MB and i dont know of a way to release it other than unload the document and reload it again (for each x pages for example) wich is not a very elegante way of doing this. What i'm i missing? Is it a bug? or my pseudo-code is wrong? Im using the 32bit dll .net version and c# with DebenuPDFLibraryDLL1014 but i've tried with the latest version and the behaviour is exactly the same. any help? Edited by rmbarbosa - 05 Aug 16 at 3:58AM

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3527	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 07 Aug 16 at 7:48PM
	Hi RM, perhaps it's better to use the DARender...functions. Or the RenderToStream... ToString... and the save at the end: http://www.debenu.com/docs/pdf_library_reference/RenderingAndPrinting.php Cheers and welcome here, Ingo
	Cheers, Ingo

dky Members Profile Find Members Posts Beginner Joined: 27 Oct 20 Status: Offline Points: 12	Post Options Post Reply Quote dky Report Post Thanks(0) Quote Reply Posted: 17 Jan 24 at 3:59PM
	I also received an error message "Out of memory while expanding memory Stream" after calling RenderPageToFile() continuously to extract more than about 10 pages from PDF pages to TIF image. What can I do ? I can't find release function to release memory after each extraction. Thanks you.

dky Members Profile Find Members Posts Beginner Joined: 27 Oct 20 Status: Offline Points: 12	Post Options Post Reply Quote dky Report Post Thanks(0) Quote Reply Posted: 17 Jan 24 at 4:01PM
	Dear Ingo, I also received an error message "Out of memory while expanding memory Stream" after calling RenderPageToFile() continuously to extract more than about 10 pages from PDF pages to TIF image. What can I do ? I can't find release function to release memory after each extraction. Thanks you.

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3527	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 20 Feb 24 at 7:54PM
	Hi Dan :) How to free memory you can read here: https://www.oreilly.com/library/view/delphi-in-a/1565926595/re116.html Or you can try Google with "FreeMem Delphi". Using the QuickPDF-functions you can always free memory like below: Hint 1: try QP := TDebenuPDFLibrary1822.Create; try QP.LoadFromFile(xFileName, ''); // . . . finally QP.Free; // <--- // . . . end; except QP.Free; // <--- // . . . end; Hint 2: function Get...; var Stream: TMemoryStream; //. . . begin try Stream := TMemoryStream.Create; // . . . finally Stream.Free; // <--- end; end;
	Cheers, Ingo