[Python-Dev] Memoryviews should expose the underlying memory address

Thu Sep 20 19:57:37 CEST 2012

On 20/09/2012 5:53pm, David Beazley wrote:
> How? I must be missing something very obvious.

I would not call it obvious, but you can do
 >>> m = memoryview(bytearray(5))
 >>> ctypes.addressof(ctypes.c_char.from_buffer(m))
 149979304
However, this only works for writable memoryviews. For
read-only memoryviews you could do
 >>> obj = ctypes.py_object(m)
 >>> address = ctypes.c_void_p()
 >>> length = ctypes.c_ssize_t()
 >>> ctypes.pythonapi.PyObject_AsReadBuffer(obj, 
ctypes.byref(address), ctypes.byref(length))
 0
 >>> address, length
 (c_void_p(149979304), c_long(5))