Memory leak?
Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=1726
Printed Date: 03 Jul 25 at 10:52AM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com
Topic: Memory leak?
Posted By: hansmerkl
Subject: Memory leak?
Date Posted: 05 Feb 11 at 10:22PM
The following C# code runs out of memory with even medium sized files. After calling DACloseFile the memory gets released. Am I missing something that has to be released?
QuickPDFAX0723.PDFLibrary Lib = new QuickPDFAX0723.PDFLibrary();
Lib.UnlockKey("xxxx");
string fnIn = this.buttonEditPDF.Text;
int DocHandle = Lib.DAOpenFileReadOnly(fnIn, "");
int PageCount = Lib.DAGetPageCount(DocHandle);
for (int i = 0; i < PageCount; i++)
{
int PageHandle = Lib.DAFindPage(DocHandle, i + 1);
int ImageListHandle = Lib.DAGetPageImageList(DocHandle, PageHandle);
int ImageCount = Lib.DAGetImageListCount(DocHandle, ImageListHandle);
for (int ii = 0; ii < ImageCount; ii++)
{
var ImageBuffer = Lib.DAGetImageDataToVariant(DocHandle, ImageListHandle, ii + 1);
byte[] b = ImageBuffer as byte[];
}
}
MessageBox.Show("Done");
Lib.DACloseFile(DocHandle);
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Replies:
Posted By: Ingo
Date Posted: 06 Feb 11 at 12:29PM
Hi Hans!
After DACloseFile
The "Free" should follow.
You can read here sometimes about memory-problems
as a result based on DAFindPage.
I've an old workaround to avoid this:
Using a counter like this (for a loop in a loop) ...
QP := TQuickPDF0721.Create;
// . . .
pc := pc + 1;
if ( pc = 5 ) Then
begin
pc := 0;
QP.Free;
QP := TQuickPDF0721.Create;
// QP.UnlockKey('MyKey...');
// . . .
end;
// . . .
QP.Free;
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Posted By: hansmerkl
Date Posted: 06 Feb 11 at 7:39PM
It's a good idea to close to the file from time to time. I hope the performance won't suffer too much.
I hope QuickPDF are aware of the DAFindPage problem and will fix it soon.
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Posted By: Ingo
Date Posted: 06 Feb 11 at 8:15PM
Hi!
The DAFindPage-prob is already an older one and so i don't think that it will be fixed soon ;-)
But you can avoid the DA-functions.
Use the "normal" ones and with the current library version you won't have any disadvantages.
Cheers, Ingo
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Posted By: hansmerkl
Date Posted: 06 Feb 11 at 8:27PM
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That's probably the way to go.
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