symbian-qemu-0.9.1-12/python-2.6.1/Doc/c-api/objbuffer.rst
author martin.trojer@nokia.com
Fri, 31 Jul 2009 15:01:17 +0100
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.. highlightlang:: c
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.. _abstract-buffer:
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Buffer Protocol
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===============
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.. cfunction:: 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 and
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   *buffer_len* to the buffer length.  Returns ``-1`` and sets a :exc:`TypeError`
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   on error.
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   .. versionadded:: 1.6
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.. cfunction:: 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.  The
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   *obj* argument must support the single-segment readable buffer interface.  On
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   success, returns ``0``, sets *buffer* to the memory location and *buffer_len* to
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   the buffer length.  Returns ``-1`` and sets a :exc:`TypeError` on error.
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   .. versionadded:: 1.6
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.. cfunction:: 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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.. cfunction:: 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, returns
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   ``0``, sets *buffer* to the memory location and *buffer_len* to the buffer
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   length.  Returns ``-1`` and sets a :exc:`TypeError` on error.
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   .. versionadded:: 1.6
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