On Mon, Mar 28, 2011 at 12:44 PM, Mark Storer <[email protected]> wrote:
> Ah.  You have an XFA based form, and are using AcroForm tech to address it.  
> Don't do that.

Alright, I suppose that's good to know (I do see that now, and also
see it documented that using the high-level AcroForms API *usually*
works, but not always, and that SetListSelection never will). So, it
took a bit of trial and error, but I successfully retrieved the XFA
xml, modified the value of that list field, then put it back, and the
new value showed up in the pdf. But in the case of an arbitrary pdf
where I don't have previous knowledge of what the underlying xml looks
like... this might also be a dumb question, but I don't suppose
there's any way to find the correct value to modify in the xml (if
multiple fields share the same human-readable name) based on the
information about the fields returned from
PdfReader.AcroFields.Fields? Can I even assume that
PdfReader.AcroFields.Fields will always *have* information about the
number and names of fields in an XFA-based form, or should I be
looking elsewhere in that case? (It's always seemed to work so far in
abstracting whether the input was xfa-based or not, but possibly we
were just lucky?)

But anyway, thanks again for pointing me in the right direction.
-Adam

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