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33 lines
785 B
ReStructuredText
33 lines
785 B
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Advanced usage
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===============
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Packer
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------
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autoreset
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~~~~~~~~~
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When you used ``autoreset=False`` option of :class:`~msgpack.Packer`,
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``pack()`` method doesn't return packed ``bytes``.
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You can use :meth:`~msgpack.Packer.bytes` or :meth:`~msgpack.Packer.getbuffer` to
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get packed data.
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``bytes()`` returns ``bytes`` object. ``getbuffer()`` returns some bytes-like
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object. It's concrete type is implement detail and it will be changed in future
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versions.
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You can reduce temporary bytes object by using ``Unpacker.getbuffer()``.
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.. code-block:: python
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packer = Packer(use_bin_type=True, autoreset=False)
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packer.pack([1, 2])
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packer.pack([3, 4])
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with open('data.bin', 'wb') as f:
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f.write(packer.getbuffer())
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packer.reset() # reset internal buffer
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