从 3.0 版起弃用。
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()
(或
y*
or
w*
format codes
采用
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
)
¶
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
当出错时。
PyObject_AsReadBuffer
(
PyObject
*obj
, const void
**buffer
, Py_ssize_t
*buffer_len
)
¶
Returns a pointer to a read-only memory location containing arbitrary data.
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
当出错时。
PyObject_CheckReadBuffer
(
PyObject
*o
)
¶
返回
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 correspoding functions will get suppressed. To get error reporting use
PyObject_GetBuffer()
代替。
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
TypeError
当出错时。