How? I must be missing something very obvious. Cheers, Dave
On Sep 20, 2012, at 11:48 AM, Benjamin Peterson wrote: > 2012年9月20日 David Beazley <[email protected]>: >> I have recently been experimenting with the memoryview() built-in and have >> come to believe that it really needs to expose the 'buf' attribute of the >> underlying Py_buffer structure as an integer (see PEP 3118). Let me explain. >> >> The whole point of PEP 3118 (as I understand it) is to provide a means for >> exchanging or sharing array data across different libraries such as numpy, >> PIL, ctypes, Cython, etc. If you're working with Py_buffer objects at the >> C level, this works fine. However, if you're working purely in Python, >> you're only able to get partial information about memory views such as the >> shape and size. You can't get the actual pointer to the underlying memory >> (unless I've missed something obvious). >> >> This is unfortunate because it means that you can't write Python code to >> link memoryviews to other kinds of compiled code that might want to operate >> on array-oriented data. For example, you can't pass the raw pointer into a >> function that you've exposed via ctypes. Similarly, you can't pass the >> pointer into functions you've dynamically compiled using libraries such as >> LLVM-py. There might be other kinds of applications, but just having >> that one bit of extra information available would be useful for various >> advanced programming techniques involving extensions and memory buffers. > > Presumably ctypes should be able to do this conversion for you. > > > > -- > Regards, > Benjamin _______________________________________________ Python-Dev mailing list [email protected] http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com