mirror of
https://github.com/python/cpython.git
synced 2025-11-04 07:31:38 +00:00
66 lines
2.5 KiB
ReStructuredText
66 lines
2.5 KiB
ReStructuredText
.. highlightlang:: c
|
|
|
|
.. _abstract-buffer:
|
|
|
|
|
|
Old Buffer Protocol
|
|
===================
|
|
|
|
This section describes the legacy buffer protocol, which has been introduced
|
|
in Python 1.6. It is still supported but deprecated in the Python 2.x series.
|
|
Python 3.0 introduces a new buffer protocol which fixes weaknesses and
|
|
shortcomings of the protocol, and has been backported to Python 2.6. See
|
|
:ref:`bufferobjects` for more information.
|
|
|
|
|
|
.. 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.
|
|
|
|
.. versionadded:: 1.6
|
|
|
|
.. versionchanged:: 2.5
|
|
This function used an :ctype:`int *` type for *buffer_len*. This might
|
|
require changes in your code for properly supporting 64-bit systems.
|
|
|
|
|
|
.. 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.
|
|
|
|
.. versionadded:: 1.6
|
|
|
|
.. versionchanged:: 2.5
|
|
This function used an :ctype:`int *` type for *buffer_len*. This might
|
|
require changes in your code for properly supporting 64-bit systems.
|
|
|
|
|
|
.. cfunction:: int PyObject_CheckReadBuffer(PyObject *o)
|
|
|
|
Returns ``1`` if *o* supports the single-segment readable buffer interface.
|
|
Otherwise returns ``0``.
|
|
|
|
.. versionadded:: 2.2
|
|
|
|
|
|
.. cfunction:: int PyObject_AsWriteBuffer(PyObject *obj, void **buffer, Py_ssize_t *buffer_len)
|
|
|
|
Returns a pointer to a writeable 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.
|
|
|
|
.. versionadded:: 1.6
|
|
|
|
.. versionchanged:: 2.5
|
|
This function used an :ctype:`int *` type for *buffer_len*. This might
|
|
require changes in your code for properly supporting 64-bit systems.
|
|
|