Incremental save not working

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   Hello all, 

I'm trying to edit (adding a new empty signature) a digitally signed document and save it with AppendToFile() method, for preserve the integrity of the signature. 

What i do is this (from the Sample console):

QP.LoadFromFile(GetInputFolder() + "test.pdf", "");

f = QP.NewFormField("signature_field", 6);
QP.SetFormFieldBounds(f, 100, 100, 200, 80);
QP.SetFormFieldPage(f, 1);

QP.AppendToFile(GetInputFolder() + "test.pdf");
DisplayPDFReader(GetInputFolder() + "test.pdf");

test.pdf is a pdf altready signed. 

What i obtain from this snippet is a pdf with error on the sitgnature, instead of the green flag.

If i try for example to do the same thing with itextsharp, the operation doesn't cause any corruption. 

What am I missing? 

Thanks. 

Fabrizio

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pinozzy Members Profile Find Members Posts Beginner Joined: 22 Mar 16 Status: Offline Points: 10	Post Options Post Reply Quote pinozzy Report Post Thanks(0) Quote Reply Topic: Incremental save not working Posted: 03 May 16 at 11:22AM
	Hello all, I'm trying to edit (adding a new empty signature) a digitally signed document and save it with AppendToFile() method, for preserve the integrity of the signature. What i do is this (from the Sample console): QP.LoadFromFile(GetInputFolder() + "test.pdf", ""); f = QP.NewFormField("signature_field", 6); QP.SetFormFieldBounds(f, 100, 100, 200, 80); QP.SetFormFieldPage(f, 1); QP.AppendToFile(GetInputFolder() + "test.pdf"); DisplayPDFReader(GetInputFolder() + "test.pdf"); test.pdf is a pdf altready signed. What i obtain from this snippet is a pdf with error on the sitgnature, instead of the green flag. If i try for example to do the same thing with itextsharp, the operation doesn't cause any corruption. What am I missing? Thanks. Fabrizio

Ingo Members Profile Find Members Posts Moderator Group Joined: 29 Oct 05 Status: Offline Points: 3524	Post Options Post Reply Quote Ingo Report Post Thanks(0) Quote Reply Posted: 03 May 16 at 7:11PM
	Hi, if the pdf is already signed an additional processing on it shouldn't work i hope ;-)
	Cheers, Ingo

pinozzy Members Profile Find Members Posts Beginner Joined: 22 Mar 16 Status: Offline Points: 10	Post Options Post Reply Quote pinozzy Report Post Thanks(0) Quote Reply Posted: 03 May 16 at 7:21PM
	well, it's not an additional process to the original one, its incremental, this means that all revisions are saved and exportable with adobe reader. this tecnique is used by major graphometry softwares like xyzmo or others. i can do that process with itext, for now i solved that way, but i'd prefer to use debenu... if possibile. many thanks for the support!