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67 lines
2.5 KiB
67 lines
2.5 KiB
7 months ago
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.. highlightlang:: c
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.. _abstract-buffer:
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Old Buffer Protocol
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===================
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This section describes the legacy buffer protocol, which has been introduced
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in Python 1.6. It is still supported but deprecated in the Python 2.x series.
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Python 3 introduces a new buffer protocol which fixes weaknesses and
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shortcomings of the protocol, and has been backported to Python 2.6. See
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:ref:`bufferobjects` for more information.
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.. c:function:: int PyObject_AsCharBuffer(PyObject *obj, const char **buffer, Py_ssize_t *buffer_len)
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Returns a pointer to a read-only memory location usable as character-based
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input. The *obj* argument must support the single-segment character buffer
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interface. On success, returns ``0``, sets *buffer* to the memory location
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and *buffer_len* to the buffer length. Returns ``-1`` and sets a
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:exc:`TypeError` on error.
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.. versionadded:: 1.6
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.. versionchanged:: 2.5
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This function used an :c:type:`int *` type for *buffer_len*. This might
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require changes in your code for properly supporting 64-bit systems.
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.. c:function:: int PyObject_AsReadBuffer(PyObject *obj, const void **buffer, Py_ssize_t *buffer_len)
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Returns a pointer to a read-only memory location containing arbitrary data.
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The *obj* argument must support the single-segment readable buffer
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interface. On success, returns ``0``, sets *buffer* to the memory location
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and *buffer_len* to the buffer length. Returns ``-1`` and sets a
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:exc:`TypeError` on error.
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.. versionadded:: 1.6
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.. versionchanged:: 2.5
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This function used an :c:type:`int *` type for *buffer_len*. This might
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require changes in your code for properly supporting 64-bit systems.
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.. c:function:: int PyObject_CheckReadBuffer(PyObject *o)
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Returns ``1`` if *o* supports the single-segment readable buffer interface.
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Otherwise returns ``0``.
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.. versionadded:: 2.2
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.. c:function:: int PyObject_AsWriteBuffer(PyObject *obj, void **buffer, Py_ssize_t *buffer_len)
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Returns a pointer to a writeable memory location. The *obj* argument must
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support the single-segment, character buffer interface. On success,
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returns ``0``, sets *buffer* to the memory location and *buffer_len* to the
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buffer length. Returns ``-1`` and sets a :exc:`TypeError` on error.
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.. versionadded:: 1.6
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.. versionchanged:: 2.5
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This function used an :c:type:`int *` type for *buffer_len*. This might
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require changes in your code for properly supporting 64-bit systems.
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