How to get a pointer to raw binary data in Python?

Question

I'd like to get a pointer to raw binary data of bytes, bytearray, or memoryview instance via ctypes and Python API.

For reading, (c_char * len(b)).from_buffer(b) works in Python 3. For writing, I used the following:

buffer = c_void_p()
length = c_ssize_t()
pythonapi.PyObject_AsReadBuffer(py_object(b), byref(buffer), byref(length))

However I found out that the code doesn't work in Python 2.7 with memoryview.

How about ctypes.string_at() ?

mdurant
– mdurant

2014-08-02 18:32:48 +00:00
Commented Aug 2, 2014 at 18:32 — mdurant
– mdurant, Commented Aug 2, 2014 at 18:32
@mdurant That does the opposite.

Adam Bartoš
– Adam Bartoš

2014-08-04 06:56:55 +00:00
Commented Aug 4, 2014 at 6:56 — Adam Bartoš
– Adam Bartoš, Commented Aug 4, 2014 at 6:56

Adam Bartoš · Accepted Answer · 2015-08-03 14:00:23Z

3

Currently, I use a Python buffer structure defined via ctypes and a Python API function PyObject_GetBuffer to get the buffer from arbitrary compatible object. My Python buffer structure object is then transformed to c_char array and created buffer object is relased using PyBuffer_Release. See https://github.com/Drekin/win-unicode-console/blob/master/win_unicode_console/buffer.py.

answered Aug 3, 2015 at 14:00

Adam Bartoš

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