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.. highlightlang:: c Old Buffer Protocol ------------------- .. deprecated:: 3.0 These functions were part of the "old buffer protocol" API in Python 2. In Python 3, this protocol doesn't exist anymore but the functions are still exposed to ease porting 2.x code. They act as a compatibility wrapper around the :ref:`new buffer protocol <bufferobjects>`, but they don't give you control over the lifetime of the resources acquired when a buffer is exported. Therefore, it is recommended that you call :c:func:`PyObject_GetBuffer` (or the ``y`` or ``w`` :ref:`format codes <arg-parsing>` with the :c:func:`PyArg_ParseTuple` family of functions) to get a buffer view over an object, and :c:func:`PyBuffer_Release` when the buffer view can be released. .. c:function:: 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. .. c:function:: 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. .. c:function:: int PyObject_CheckReadBuffer(PyObject o) Returns ``1`` if o* supports the single-segment readable buffer interface. Otherwise returns ``0``. .. c:function:: 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.

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