Rendering interactive Pdf forms to images issue
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=3975
Printed Date: 29 Apr 24 at 9:17AM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com
Topic: Rendering interactive Pdf forms to images issue
Posted By: Vladimir
Subject: Rendering interactive Pdf forms to images issue
Date Posted: 23 Feb 22 at 2:32PM
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We are using QPDF version 17.11 for the document management with Delphi Xe10. The problem appears when we use PDFium engine to render Pdf interactive Form pages into images. Namely, the context of the form controls is blank on an image. Yet the only possible solution I found seems is flattening forms into plain Pdf. Is this the only way to go?
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Replies:
Posted By: Vladimir
Date Posted: 23 Feb 22 at 10:13PM
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It looks that flattening forms' fields (FlattenAllFormFields()) doesn't work with Delphi FoxIt library. Adding a call for SetRenderOptions() to include rendering form controls has no affect neither. The interactive AcroForm are still precented with empty fields when rendering to an Image. Something is broken there ... Any ideas?
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Posted By: tfrost
Date Posted: 24 Feb 22 at 11:14AM
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I have also found that QPDF fails to render form field content for some (but not all) samples of PDF documents with form fields. We are using v18 and Delphi 10.4.2. To show form field content reliably we have to use the PDFIUM DLL, but I have not tested with the QPDF rendering option which selects the use of this DLL. When you say you use PDFIUM, do you mean that you use the QPDF option to select it, or do you instead call it directly or via the Winsoft wrapper?
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Posted By: Vladimir
Date Posted: 24 Feb 22 at 2:35PM
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Well, we built a wrapper for Foxit Quick PDF Library (DebenuPDFLibrary1711.pas etc.) with setting the rendering engine to PDFium. I tried to render at least two Pdf AcroForm docs and both show blank form fields when pages rendered to images. Neither SetRenderOptions(1, 1) (forcing the FGDIPlusSettings.RenderFormFields) nor FlattenAllFormFields() affect the result. Switching back to DPLR rendering engine brings form fields back, however with DPLR we see poor OCR results in some docs (unreadable characters). Any suggestions? Thanks!
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