On Sep 19, 5:10 am, Thomas Jollans <tho...@jollybox.de> wrote: > On Sunday 19 September 2010, it occurred to Carl Banks to exclaim: > > I am creating a ctypes buffer from an existing non-ctypes object that > > supports buffer protocol using the following code: > > > from ctypes import * > > > PyObject_AsReadBuffer = pythonapi.PyObject_AsReadBuffer > > PyObject_AsReadBuffer.argtypes = > > [py_object,POINTER(c_void_p),POINTER(c_size_t)] > > PyObject_AsReadBuffer.restype = None > > > def ctypes_buffer_from_buffer(buf): > > cbuf = c_void_p() > > size = c_size_t() > > PyObject_AsReadBuffer(buf,byref(cbuf),byref(size)) > > return cbuf > > If I understand what you are doing correctly, you're referencing a Python > buffer object and returning a pointer wrapped in some ctypes thingy. hmm. I > see some problems in your code: > > * You're not passing the size along. In the name of sanity, why on earth > not?! The pointer cannot be safely used without knowing how long the area > of memory referenced is!
How D'Olivero of you to overreact this way. A. No, and B. I already know the size of the object > * You're using the old buffer protocol. You might rather implement this with > the one introduced with Python 3.0, and supported in 2.6 as well. Hmm, I didn't know they got that into 2.6. Maybe I'll do that, thanks. Carl Banks -- http://mail.python.org/mailman/listinfo/python-list
