Deprecated since version 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 new buffer protocol, 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 PyObject_GetBuffer()
(or the y* or w* format codes with the
PyArg_ParseTuple() family of functions) to get a buffer view over
an object, and PyBuffer_Release() when the buffer view can be released.
PyObject_AsCharBuffer(PyObject *obj, const char **buffer, Py_ssize_t *buffer_len)0, sets buffer to the memory location and buffer_len to the buffer length. Returns -1 and sets a TypeError on error.PyObject_AsReadBuffer(PyObject *obj, const void **buffer, Py_ssize_t *buffer_len)0, sets buffer to the memory location and buffer_len to the buffer length. Returns -1 and sets a TypeError on error.PyObject_CheckReadBuffer(PyObject *o)Returns 1 if o supports the single-segment readable buffer interface.
Otherwise returns 0. This function always succeeds.
Note that this function tries to get and release a buffer, and exceptions
which occur while calling corresponding functions will get suppressed.
To get error reporting use PyObject_GetBuffer() instead.
PyObject_AsWriteBuffer(PyObject *obj, void **buffer, Py_ssize_t *buffer_len)0, sets buffer to the memory location and buffer_len to the buffer length. Returns -1 and sets a TypeError on error.