Name
  doc:SaveToFile -- save document to a file
Synopsis

      status = doc:SaveToFile(filename)

Function
  `doc:SaveToFile()` saves the current document to a file.

  Returns `#HPDF_OK` on success, otherwise it returns an error code and the error handler is called.

Inputs
  filename
    The name of file to save.
Results
  status
    status code
Errors
  `#HPDF_INVALID_DOCUMENT` - An invalid document handle is set.

  `#HPDF_FAILED_TO_ALLOC_MEM` - Memory allocation failed.

  `#HPDF_FILE_IO_ERROR` - An error occurred while processing file I/O.

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