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 introduces a new buffer protocol which fixes weaknesses and shortcomings of the protocol, and has been backported to Python 2.6. See Buffers and Memoryview Objects for more information.
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
TypeError on error.
New in version 1.6.
Changed in version 2.5: This function used an int * type for buffer_len. This might
require changes in your code for properly supporting 64-bit systems.
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
TypeError on error.
New in version 1.6.
Changed in version 2.5: This function used an int * type for buffer_len. This might
require changes in your code for properly supporting 64-bit systems.
int PyObject_CheckReadBuffer(PyObject *o)
Returns 1 if o supports the single-segment readable buffer interface.
Otherwise returns 0.
New in version 2.2.
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 TypeError on error.
New in version 1.6.
Changed in version 2.5: This function used an int * type for buffer_len. This might
require changes in your code for properly supporting 64-bit systems.