code: def buffer_write(library, session, data):
      
  
      return_count = ViUInt32()
      # [ViSession, ViBuf, ViUInt32, ViPUInt32]
      ret = library.viBufWrite(session, data, len(data), byref(return_count))
      return return_count.value, ret
docs: Writes data to a formatted I/O write buffer synchronously.
  
      Corresponds to viBufWrite function of the VISA library.
  
      :param library: the visa library wrapped by ctypes.
      :param session: Unique logical identifier to a session.
      :param data: data to be written.
      :type data: bytes
      :return: number of written bytes, return value of the library call.
      :rtype: int, :class:`pyvisa.constants.StatusCode`