Name
  doc:GetError -- get last error code
Synopsis

      status = doc:GetError()

Function
  `doc:GetError()` returns the last error code of specified document object.

  Note that some functions also set a detailed error code. doc:GetErrorDetail() can be used to get this detailed error code.

  Returns the last error code of document object, or `#HPDF_OK` if no last error.

Inputs
  none

Results
  status
    status code
Errors
  `#HPDF_INVALID_DOCUMENT` - An invalid document handle is set.

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