Debenu Quick PDF Library - PDF SDK Community Forum : How to identify signed acroform (Signature)

How to identify signed acroform (Signature) : Hi Ingo,sorry... my fault.. I...

Mon, 01 Apr 2019 15:32:31 +0000

Author: zannydive
Subject: 3686
Posted: 01 Apr 19 at 3:32PM

Hi Ingo,

sorry... my fault.. I identify and the infor are provide correcly.

Thanks for all help

How to identify signed acroform (Signature) : Hi Ingo,thanks for the answer.I...

Mon, 01 Apr 2019 15:16:11 +0000

Author: zannydive
Subject: 3686
Posted: 01 Apr 19 at 3:16PM

Hi Ingo,

thanks for the answer.

I didn't know that was user to user.. sorry.

I use string AcroFieldValue = DPL.GetFormFieldValueByTitle(AcroFieldTitle) but i'm not able to obtain any info.

If you have time could you tell me which functionality you had used for retrive the field value?

Thanks for the help.

Marco

How to identify signed acroform (Signature) : Hi Marco,i think you know that's...

Sun, 31 Mar 2019 22:35:07 +0000

Author: Ingo
Subject: 3686
Posted: 31 Mar 19 at 10:35PM

Hi Marco,

i think you know that's only a user-user-forum here.
So sometimes you have to wait for an answer some days...
I've checked the file now...

There are two form fields in the document.
The formfield types are both "signature".
The first has form field caption "DigitalSignatureField_0" with much content in the relevant form field value.
The second has form field caption "DigitalSignatureField_1" but there's no content in the relevant form field value.
My resume:
There are two signature fields in the document.
The first signature field is signed - the second is empty.

Try the functionalities from QuickPDF and you can get this facts by yourself ;-)

How to identify signed acroform (Signature) : Hi Ingo,have you had the opportunity...

Sat, 30 Mar 2019 14:26:18 +0000

Author: zannydive
Subject: 3686
Posted: 30 Mar 19 at 2:26PM

Hi Ingo,

have you had the opportunity to check?

Marco

How to identify signed acroform (Signature) : Hi Ingo,I prepared 1 pdf that...

Mon, 25 Mar 2019 21:16:06 +0000

Author: zannydive
Subject: 3686
Posted: 25 Mar 19 at 9:16PM

Hi Ingo,

I prepared 1 pdf that contain 2 signature field:

Title-->DigitalSignatureField_0 it's signed

Title--> DigitalSignatureFiled_1 it's not signed.

Below the result of mine analysys:

=========================================

AcroForm Name: DigitalSignatureField_0
AcroForm Type: Signature
AcroForm Value:
AcroForm Page: 2
AcroForm Height: 40.875
AcroForm Width: 203.625
AcroForm Top: 565.5
AcroForm Left: 57.375
=========================================
AcroForm Name: DigitalSignatureField_1
AcroForm Type: Signature
AcroForm Value:
AcroForm Page: 2
AcroForm Height: 40.875
AcroForm Width: 202.875
AcroForm Top: 723
AcroForm Left: 58.125
=========================================

You can download from this dbox link :

https://www.dropbox.com/s/zsvastc3hfwll5a/Test_Signature.pdf?dl=0

Thanks for the help.

Marco

Edited by zannydive - 25 Mar 19 at 9:17PM

How to identify signed acroform (Signature) : for me content is the value ;-)But...

Mon, 25 Mar 2019 20:12:05 +0000

Author: Ingo
Subject: 3686
Posted: 25 Mar 19 at 8:12PM

for me content is the value ;-)
But it sounds interesting for me so if you want, you can send me one or two of your signed samples and i'll try to develope a routine for this purpose.

How to identify signed acroform (Signature) : Hi Indingo,thanks for the clafirication...

Mon, 25 Mar 2019 14:55:22 +0000

Author: zannydive
Subject: 3686
Posted: 25 Mar 19 at 2:55PM

Hi Indingo,

thanks for the clafirication and yes you understand correctly.

I'm newbie on Debenu Library .

Currently form the pdf I can Identify if there are a signature :

if(DPL.GetFormFieldType(y)==6) // it's signature
>If there's a content then it's digitally signed.
Checking the sample i didn't see nothing about the content.. I checked the value
and it's alwasy empty if the acroform it's signed or not.
Do you know how to have access at the content? Have you some sample?

Thanks again for the help.
Br
Marco

How to identify signed acroform (Signature) : I fear i'm not understanding...

Sun, 24 Mar 2019 17:59:24 +0000

Author: Ingo
Subject: 3686
Posted: 24 Mar 19 at 5:59PM

I fear i'm not understanding but...
With QuickPDF you can check:
If there's a content then it's digitally signed.
Without content there's only a field for (future) digitally signing.
The library doesn't offer a direct functionality to check the signature.
Foxit/Debenu says this:
http://www.quickpdflibrary.com/faq/verify-a-signature.php

How to identify signed acroform (Signature) : Hi Indingo,thanks for the answer.Probably...

Sun, 24 Mar 2019 01:10:02 +0000

Author: zannydive
Subject: 3686
Posted: 24 Mar 19 at 1:10AM

Hi Indingo,

thanks for the answer.

Probably i'm mistaking to expose my question.

If I have a pdf that contain Acroform type Signature using the sample I'm able to identify that it's an Signature Acroform .

I'm not able to understand via code if the Signature acroform identified it's Digital Signed or Not.

I need understand because if it's not I can Sign Digitally otherwise i should prevent the Digital Signature.

Do you know if it's exposed a method for identify it? Or do you know how to do?

Thanks again for the Help

Marco

How to identify signed acroform (Signature) : Hi Marco,if you extract a pdf-form...

Tue, 19 Mar 2019 19:08:51 +0000

Author: Ingo
Subject: 3686
Posted: 19 Mar 19 at 7:08PM

Hi Marco,

if you extract a pdf-form and if there is signature content (check the form field type... look into the sample) ... then a signature is used.
If there isn't signature content then not.
Another way can be do it by yourself.
It's easy. Drectly read the raw pdf content into a stream or string and check for relevant signature syntax. Open a relevant pdf with Notepad will give you an idea what i'm meaning... ;-)