Debenu Quick PDF Library - PDF SDK Community Forum : Retaining OCG / Layers When Merging PDFs http://www.quickpdf.org/forum/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sat, 27 Jun 2026 19:38:56 +0000 Tue, 14 Feb 2023 19:00:46 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.01 360 www.quickpdf.org/forum/RSS_post_feed.asp?TID=4001 <![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[Retaining OCG / Layers When Merging PDFs : What you can do first is count...]]> http://www.quickpdf.org/forum/retaining-ocg-layers-when-merging-pdfs_topic4001_post16225.html#16225 Author: Ingo
Subject: 4001
Posted: 14 Feb 23 at 7:00PM

What you can do first is count the layers.
Second step: Copy your file as layercount times (5 layers means 6 copies cause it starts with 0 i think).
Third step: Remove from each file another layer.
Fourth step: Compare each file version after layer removed.
I don't know the value of this procedures but that's all (i think) what you can do with layers (contentstreams) using QuickPDF.

]]> Tue, 14 Feb 2023 19:00:46 +0000 http://www.quickpdf.org/forum/retaining-ocg-layers-when-merging-pdfs_topic4001_post16225.html#16225 <![CDATA[Retaining OCG / Layers When Merging PDFs : I tried something like this, but...]]> http://www.quickpdf.org/forum/retaining-ocg-layers-when-merging-pdfs_topic4001_post16224.html#16224 Author: fellafoo
Subject: 4001
Posted: 12 Feb 23 at 8:04PM

I tried something like this, but the layers are gone.
if PDF_NewPDFLib(PDFLib, True) then begin
  i := 1;
  while (i <= Files2Merge.Count) do begin
    PDFLib.LoadFromFile(Files2Merge[i - 1], ''); { Load Existing File }
    PDFLib.SelectDocument(PDFLib.GetDocumentID(1)); { Select 'Blank' Document }
    PDFLib.CopyPageRanges(PDFLib.GetDocumentID(2), '1'); { Copy Page 1 from existing to 'blank' }
    PDFLib.RemoveDocument(PDFLib.GetDocumentID(2)); { Remove existing from list }
    Inc(i);
  end;
  PDFLib.DeletePages(1, 1); { Delete blank page }
  PDFLib.SaveToFile(MergeMaster);
end;
]]> Sun, 12 Feb 2023 20:04:31 +0000 http://www.quickpdf.org/forum/retaining-ocg-layers-when-merging-pdfs_topic4001_post16224.html#16224 <![CDATA[Retaining OCG / Layers When Merging PDFs : perhaps you can do some experiments...]]> http://www.quickpdf.org/forum/retaining-ocg-layers-when-merging-pdfs_topic4001_post16222.html#16222 Author: Ingo
Subject: 4001
Posted: 12 Feb 23 at 5:14PM

perhaps you can do some experiments with MergeDocument or ExtractFilePages?
Perhaps with better results?

]]> Sun, 12 Feb 2023 17:14:58 +0000 http://www.quickpdf.org/forum/retaining-ocg-layers-when-merging-pdfs_topic4001_post16222.html#16222 <![CDATA[Retaining OCG / Layers When Merging PDFs : Dear Forum Members:Do any of you...]]> http://www.quickpdf.org/forum/retaining-ocg-layers-when-merging-pdfs_topic4001_post16219.html#16219 Author: fellafoo
Subject: 4001
Posted: 09 Feb 23 at 7:00PM

Dear Forum Members:

Do any of you know how to retain OCG / Layers while merging PDFs?

I can merge multiple PDFs with PDFLib.MergeFileList or PDFLib.MergeFileListFast but only the first page retains its layers. I've experimented with MergeDocument and MergeFiles and get the same results. I expect behind the scenes these routines do essentially the same thing.

The PDFs I'm merging are all one page each. Each one has layers and all are created using PDFLib.

Thanks,

MFM
]]> Thu, 09 Feb 2023 19:00:54 +0000 http://www.quickpdf.org/forum/retaining-ocg-layers-when-merging-pdfs_topic4001_post16219.html#16219