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paleise  
#1 Posted : Monday, February 11, 2019 6:26:36 AM(UTC)
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paleise

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Hi,
is it possible to set a watermark in pdf document on runtime?

Thanks for your time!

Regards
Peter
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Paul Rayman  
#2 Posted : Tuesday, February 12, 2019 4:59:00 AM(UTC)
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Paul Rayman

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Well.. yes. It is possible.

In the current version you may get access to annotations through page.Dictionary["Annots"] property and form Watermark annotation. But you need to know PDF specification to do that.

I can suggest you to try Pdfium.Net SDK ver. 4.0 release candidate.
You can download it here
https://forum.patagames.com/posts/m1578-Version-4-0-2704-was-released-on-March-06--2019#post1578


PdfAnnotation were addded in this version of SDK. So that the Watermark can be added as following

Code:

var doc = PdfDocument.Load(...);
var page = doc.Pages[0];
if(page.Annots == null)
   page.CreateAnnotations();

var txt = PdfTextObject.Create("This is my watermark", 0, 0, PdfFont.CreateStock(doc, FontStockNames.Arial), 35);
page.Annots.Add(new PdfWatermarkAnnotation(page, txt));

page.Dispose(); //To force the page to reload and apply changes in the PDF viewer

Edited by user Wednesday, March 6, 2019 12:19:56 AM(UTC)  | Reason: Not specified
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