How to view Arabic text on PDF digital signature appearance correctly using iText Sharp?

Question

I am trying to sign a PDF file using a certificate that its subject name in Arabic. Signature appearance doesn't show text correctly, the text direction should be RTL. For example, instead of "عربي" it appears "ي ب ر ع"

 PdfFont fontTest = PdfFontFactory.CreateFont(System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Fonts), "Tahoma.ttf"), PdfEncodings.IDENTITY_H, true);
PdfString pdfString = new PdfString("Digitally signed by\n " + cert.IssuedTo + "\n Date:" + DateTime.Now);
PdfSignatureAppearance appearance = signer.GetSignatureAppearance();
                        
appearance.SetReuseAppearance(false)
          .SetPageRect(rect)
          .SetPageNumber(pageNmber)
          .SetLayer2Font(fontTest)
          .SetLayer2Text(pdfString.ToString())
                            .SetRenderingMode(PdfSignatureAppearance.RenderingMode.NAME_AND_DESCRIPTION) ;

When i used itext version 5 it worked, I don't know why this issue appears in itext 7. — Menna, May 06 '21 at 22:01
Yep, but are you using pdfCalligraph (https://www.nuget.org/packages/itext7.pdfcalligraph/) add-on? — Alexey Subach, May 06 '21 at 22:21
In this case the behavior is expected because in iText 7 there is a separate add-on that facilitates complex script support (Arabic script is considered complex, see https://en.wikipedia.org/wiki/Complex_text_layout) — Alexey Subach, May 07 '21 at 08:14

score 1 · Answer 1 · answered May 07 '21 at 08:15

1

In iText 7 there is a separate add-on that facilitates complex script support. To enable support for complex scripts in iText 7, use iText pdfCalligraph add-on

answered May 07 '21 at 08:15

Alexey Subach

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How to view Arabic text on PDF digital signature appearance correctly using iText Sharp?

1 Answers1