getViewerPreference
Return an entry from the ViewerPreferences dictionary.
getViewerPreference([in] BSTR pref, [out, retval] BSTR *val)
This function retrieves an entry, specified by
pref, from
the document's ViewerPreferences dictionary. The returned value is a
null-terminated string, and its length is also stored in
*length.
Returns a zero-length string if the specified entry doesn't exist, or if the PDF file doesn't have a ViewerPreferences dictionary.
VB:
s = pdf.getViewerPreference("Duplex");
MsgBox "duplex = " & s