DynaPDF Manual - Page 199
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const PPDF* IPDF) // Instance pointer
This function checks all currently defined interactive form fields for invalid duplicate field names.
Use this function if multiple interactive forms were imported. DynaPDF does not check or change
duplicate field names during import. Therefore, check the field names and change invalid names if
necessary before closing the document. If an interactive form contains duplicate field names of fields
with different types, the document will be damaged.
If a form contains invalid duplicate field names, the names must be changed with SetFieldName().
must also be changed to avoid error messages in Adobe's Acrobat.
The function returns the handle of the first invalid field name that was found, that is a value greater
or equal zero. If no invalid field name was found the return value is -1.
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