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Tip revision: b88548069599f949c5b451ef95be739241711e24 authored by Barry Warsaw on 18 September 2008, 03:00:28 UTC
bumping to 3.0rc1
bumping to 3.0rc1
Tip revision: b885480
objbuffer.rst
.. highlightlang:: c
.. _abstract-buffer:
Buffer Protocol
===============
.. cfunction:: int PyObject_AsCharBuffer(PyObject *obj, const char **buffer, Py_ssize_t *buffer_len)
Returns a pointer to a read-only memory location usable as character-based
input. The *obj* argument must support the single-segment character buffer
interface. On success, returns ``0``, sets *buffer* to the memory location and
*buffer_len* to the buffer length. Returns ``-1`` and sets a :exc:`TypeError`
on error.
.. cfunction:: int PyObject_AsReadBuffer(PyObject *obj, const void **buffer, Py_ssize_t *buffer_len)
Returns a pointer to a read-only memory location containing arbitrary data. The
*obj* argument must support the single-segment readable buffer interface. On
success, returns ``0``, sets *buffer* to the memory location and *buffer_len* to
the buffer length. Returns ``-1`` and sets a :exc:`TypeError` on error.
.. cfunction:: int PyObject_CheckReadBuffer(PyObject *o)
Returns ``1`` if *o* supports the single-segment readable buffer interface.
Otherwise returns ``0``.
.. cfunction:: int PyObject_AsWriteBuffer(PyObject *obj, void **buffer, Py_ssize_t *buffer_len)
Returns a pointer to a writable memory location. The *obj* argument must
support the single-segment, character buffer interface. On success, returns
``0``, sets *buffer* to the memory location and *buffer_len* to the buffer
length. Returns ``-1`` and sets a :exc:`TypeError` on error.