status = doc:UseKREncodings()
doc:UseKREncodings() enables Korean encodings. After doc:UseKREncodings() is invoked, an application can use the following Korean encodings:
When doc:UseKREncodings() succeeds, it returns #HPDF_OK. Otherwise, it returns an error code and the error handler is invoked.
#HPDF_INVALID_DOCUMENT - An invalid document handle was set.
#HPDF_FAILED_TO_ALLOC_MEM - Memory allocation failed.
#HPDF_DUPLICATE_REGISTRATION - The encodingof the same name has already been registered.