Name
  doc:GetViewerPreference -- get viewer preferences
Synopsis

      flags = doc:GetViewerPreference()

Function
  `doc:GetViewerPreference()` gets the viewer preferences for the document.

  See doc:SetViewerPreference for a list of supported preferences.

Inputs
  none

Results
  flags
    viewer preferences for this document
Errors
  `#HPDF_INVALID_DOCUMENT` - An invalid document handle was set.

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