First I could not even attempt the coding in "C", but reading the manuals I searched the following page for "hidden":

Field Header Section (QDFFFINF)

Offset Bit Type Variable Name
Dec Hex

Field attribute. X'01' indicates Constant (see structure QDFFFCON, Constant Field Header Table (QDFFFCON)), X'02' indicates Output (O), X'03' indicates Message (M), X'04' indicates Input (I), X'05' indicates Both (B), X'06' indicates Hidden (H), and X'07' indicates Program to System (P).

Maybe that would help you find the type of field.

Jevgeni Astanovski said the following on Mon, 8/18/2014 9:07 AM:
I used this program as a starting point and successfully retrieved
ALMOST everything.
I needed the following:
Format name, field name, field I/O attribute (Input, Output, Both,
Hidden), field type and field length.
As wrote earlier my failure was with hidden fields.
I found one place where hidden fields names could be retrieved and
another place where I could find (probably) these fields necessary
attributes - but without field names!
Names where available for all but hidden....

On Tue, Aug 12, 2014 at 11:36 PM, Bryan Dietz <bdietz400@xxxxxxxxx> wrote:

I just did a Google search "QDFRTVFD"

which returned a "C" example for the API
"This document contains an example of how to retrieving the Row/Column
of a Field Using the QDFRTVFD API."

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