def file_name=(file_name)
      err = GPGME::gpgme_data_set_file_name(self, file_name)
      exc = GPGME::error_to_exception(err)
      raise exc if exc
      file_name
    end
def file_name=(file_name)
      err = GPGME::gpgme_data_set_file_name(self, file_name)
      exc = GPGME::error_to_exception(err)
      raise exc if exc
      file_name
    end
Sets the file name for this buffer.

 @raise [GPGME::Error::InvalidValue] if the value isn't accepted.