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