Name
  doc:GetFont -- get handle of font object
Synopsis

      font = doc:GetFont(fontname[, encodingname])

Function
  `doc:GetFont()` gets the handle of a requested font object.

  See Fonts for a list of valid font names.

  See Encodings for a list of valid encoding names.

  When `doc:GetFont()` succeeds, it returns the handle of a font object. Otherwise, it returns `Nil` and the error handler is called.

Inputs
  fontname
    a valid font name
  encodingname
    optional: a valid encoding name (defaults to current encoding)
Results
  font
    handle to a font
Errors
  `#HPDF_FAILED_TO_ALLOC_MEM` - Memory allocation failed.

  `#HPDF_INVALID_DOCUMENT` - An invalid document handle was set.

  `#HPDF_INVALID_FONT_NAME` - An invalid font name was set.

  `#HPDF_INVALID_ENCODING_NAME` - An invalid encoding name was set.

  `#HPDF_UNSUPPORTED_FONT_TYPE` - An unsupported font type was set.

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