Hello, I'm trying to programmatically fill existing signed xfa forms
with information from a database. I'm using a library called pdfbox. It
works great, except that the tag of the xfa form needs a checksum
if modified. I cannot find how to calculate that checksum anywhere. Does
Adobe have any product that would let me programmatically fill an xfa
form, and modify the contents of the tag? Thanks, Martín.
Thanks Kosta, Yes, I checked those sites but there's no useful info :(.
I can write xfa data with pdfbox, I'm actually using it because iText
didn't work well for some forms. I can manually write the xfa data and
it works perfectly, but the algorithm for calculating the checksum for
the tag doesn't seem to be documented, There's even a
stackoverflow question about this subject from iText's creator, but no
reply:
https://stackoverflow.com/questions/27470442/how-to-calculate-the-checksum-in-an-xf...
Sorry, I'll try to clarify. I'm saving the pdf using Apache's PDFBox.
XFA forms are saved inside the pdf and have an XML structure which
consists mainly of a template section, a data section, and a form
section which is the template and the data merged.. I can save the data
part and Adobe reader will pick it up no problem. But the form uses this
opening tag: . If that checksum is not valid,
Adobe Reader will ignore that section. Since I'm modifying the contents
inside the form tag, I need to upd...
Hello, This question has been asked before, but I cannot find an answer
anywhere. For XFA forms, adobe reader adds a checksum in the tag
when saving. I'm trying to automatically fill an xfa form, and I need to
calculate that checksum. Is there any documentation about how to perform
that calculation?Thanks, Martín.
