I need help - I can help - Unable to convert to images.

Unable to convert to images.

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=3301
Printed Date: 21 Sep 24 at 4:17AM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: Unable to convert to images.

Posted By: Ludwig
Subject: Unable to convert to images.
Date Posted: 05 Apr 16 at 7:05AM

I am using the licensed Android Version for Debenu Quick Pdf (12.12).

I am converting the Pages of a PDF file into jpeg images using the following code:

int fileHandle = mDQPL.DAOpenFile("file_path", password);

int pageCount = mDQPL.DAGetPageCount(fileHandle);

for (int pageIndex = 1; pageIndex <= pageCount; pageIndex++) {

int pageRef = mDQPL.DAFindPage(fileHandle, pageIndex);

mDQPL.DARenderPageToFile(fileHandle, pageRef, DEBENU_JPEG_OUTPUT, DEBENU_IMAGE_DPI,

"image_file_path");

}

This code is working for most files, however there are some for which it generated blank jpeg images for the PDF pages. For example in the following pdf:
https://drive.google.com/file/d/0B_6Z82hoBteTMzhCNVlqa0xqSjQ/view?usp=sharing

when I attempted to convert it into image using the above code, all I got is:(For its first Page)
https://drive.google.com/drive/folders/0B_6Z82hoBteTVDVUMUxUcHNxMk0

Please note: when i used the windows version of the library, it managed to successfully convert the PDF into images.

How can i handle this?

Replies:

Posted By: Ingo
Date Posted: 05 Apr 16 at 7:37PM

Hi Ludwig,

i can only test with the windows version.

My app for rendering is made with 10.14 and it works fine with your files.

The android version of the library comes last - so you can post your problem on the official support page from Debenu (if it's a real error here isn't the right place 'cause nobody here in the USER-forum can change it).

But anyway leave this function and try another one for rendering.

Below a snippet from my code - perhaps this function works better for you, too:

// . . .

lv_pwidth := QP.PageWidth;

lv_pheight := QP.PageHeight;

if ( lv_pwidth > lv_pheight ) then

lv_pmax := lv_pwidth

else

lv_pmax := lv_pheight;

lv_dpi := Round(( lv_pmax * 72 ) / 692);

If x_suchen = '' Then

begin

ProgressBar1.Position := 60;

ProgressBar1.Repaint;

end;

Save_Cursor := Screen.Cursor;

Screen.Cursor := crHourglass; { Show hourglass cursor }

targetfile := target + ExtractFileName(Edit1.Text) + '.jpg';

QP.RenderDocumentToFile(lv_dpi, 1, QP.PageCount, 1, targetfile);

// . . .

-------------
Cheers,
Ingo

Posted By: Ludwig
Date Posted: 06 Apr 16 at 1:57AM

When i used the files with a Windows version of the Debenu Library. It did work fine. The problem appears only with the Android Version. I will post the problem on the support page for Debenu.

Posted By: Ingo
Date Posted: 06 Apr 16 at 6:49PM

Never the less you could try "my" suggestion with RenderDocumentToFile ;-)

-------------
Cheers,
Ingo