I need to change the value of a field in an existing PDF file.
I am using
AcroFields and that's working fine.
But, in doing so, it is required to create a new PDF and I would like the change
to be reflected in the existing PDF itself. If I am setting the destination
to be the same as the original
filename, then my application fails.
You can't read a file and write to it simultaneously. Think of how Microsoft Word works: you can't open a Word document and write directly to it. Word always creates a temporary file, writes the changes to it, then replaces the original file with it, and then throws away the temporary file.
You can do that too:
read the original file with
create a temporary file for
PdfStamper, and when you're done,
replace the original file with the temporary file.
read the original file into a
PdfReader with this
use the path to the original file for
The latter option is more dangerous, as you'll lose the original file
if you do something that causes an exception in
If I were you, I'd create a temporary file.