Digital Signature Not Showing Up

Question

I'm in the process of creating a form, which has two digital signature fields on it.  (One for the supervisor, one for the supervisor's employee.)  I then submit this to a classic ASP script (process_form.asp#FDF) which contains code to save the fields to an FDF.  The code is below:
<%@ Language=VBScript %>
<%
Set FdfAcX = Server.CreateObject("FdfApp.FdfApp")
Set FDFin = FdfAcx.FDFOpenFromBuf (Request.BinaryRead(Request.TotalBytes))
FDFIn.FDFSaveToFile "C:\inetpub\wwwroot\JBO\test.fdf"
Set FDFin = Nothing
Set FdfAcX = Nothing
%>
I then open the FDF back up in the browser (which of course merges it with the original PDF) and it shows all the information I filled out in all of the fields EXCEPT the digital signatures.  I know the signature's in there, because I can see evidence of it when I open up the FDF in a hex editor, or even notepad.exe. (I can see my email address, for example.)
What am I doing wrong?  How do I get the signature(s) to show back up after the form is signed?  Any help would be greatly appreciated.

Answer 1

Just wanted to update this thread for anyone who might have a similar issue - I solved my problem; it was quite a bit easier than I thought it would be.
The documentation says to concatenate the original PDF with the FDF generated when you submit the PDF form to your ASP processing script, so...that's what I did, using the ADODB.Stream server object.  The only thing I did with the FDF Toolkit was use it to save the FDF to a temporary file so I could read it back with ADODB.Stream.  I then wrote the PDF and the FDF back to the Response object and voila, I have my signed PDF, along with all the fields on the PDF form stored into a SQL database (except the signature.)
For anyone thinking about storing the signature into the database, I suppose you could, but it's generally much easier to write a PDF to the disk and store a link to it in your database.