I need help - I can help - Can't signing a signature field

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Can't signing a signature field

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=3896
Printed Date: 26 Apr 24 at 2:24AM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: Can't signing a signature field

Posted By: Adia
Subject: Can't signing a signature field
Date Posted: 16 Feb 21 at 9:20AM

I am trying to sign document using PFX file.

in the document I already have a signature filed name "Sig" - code snip:

int signProcessID = debenu.NewSignProcessFromFile(fileName, "");

int res = debenu.SelectPage(1);

res = debenu.SetSignProcessField(signProcessID, "Sig");

res = debenu.SetSignProcessFieldImageFromFile(signProcessID, Path.Combine(Directory.GetCurrentDirectory(), $"SigImage.jpg"), 0);

res = debenu.SetNeedAppearances(0);

res = debenu.SetSignProcessSubFilter(signProcessID, 3);

res = debenu.SetSignProcessInfo(signProcessID, "To test digital signatures", "The World", "Contact me");

res = debenu.SetSignProcessPFXFromFile(signProcessID, GetPFXFileName(), "123456");

res = debenu.EndSignProcessToFile(signProcessID, Path.Combine(Directory.GetCurrentDirectory(), $"{Guid.NewGuid().ToString().Substring(0, 5)}.pdf"));

res = debenu.GetSignProcessResult(signProcessID);

res = debenu.ReleaseSignProcess(signProcessID);

I getting code 13 from GetSignProcessResult

Please Advice

Replies:

Posted By: tfrost
Date Posted: 16 Feb 21 at 10:27AM

First, I suggest not discarding all the res values; check each one. And also I would recommend moving your SetNeedAppearances to precede the NewSignProcess call.

Posted By: Adia
Date Posted: 16 Feb 21 at 10:42AM

Thanks for your replay.

I Am checking the res value in debug.

SetNeedAppearances, SetSignProcessFieldall, SetSignProcessFieldImageFromFile,SetSignProcessSubFilter, SetSignProcessInfo,SetSignProcessPFXFromFile return 1.

EndSignProcessToFile return 0.

GetSignProcessResult return 13.

I moved the SetNeedAppearances precede to the NewSignProcessFromFile call

but I getting the same result - 13.

Posted By: Ingo
Date Posted: 16 Feb 21 at 10:27PM

Regarding SetNeedApp... you can read this in the documentation:
"...
Most PDF viewers will create the appearance stream for all form fields when the document is opened
..."
This isn't correct behavior if you want to sign a document.
It should be firmed and unchanged.
So try SetNeeApp... with 0 or -1 and it should work as expected.

Cheers and welcome here,
Ingo

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Cheers,
Ingo