On Apr 12, 2018 09:39, jf...@ms4.hinet.net wrote:
> Chris Angelico於 2018年4月12日星期四 UTC+8下午1時31分35秒寫道：
> > On Thu, Apr 12, 2018 at 2:16 PM, <jf...@ms4.hinet.net> wrote:
> > > This C function returns a buffer which I declared it as a
> > > ctypes.c_char_p. The buffer has size 0x10000 bytes long and the valid
> > > data may vary from a few bytes to the whole size.
> > >
> > > In every call I know how much the valid data size is, but I suppose I
> > > can't use slice to get it because there may be zero byte in it. What to
> > > do?
> > >
> > You suppose? Or have you tested it?
> > ChrisA
> Yes, I had test it once before. Now, I re-do it again to make sure. After a
> call which returns 3 bytes of data, I use len(buf) to check the length and
> get the number 24. I can see the first 24 bytes of data by using buf[:30] but
> buf will cause an "index out of range" error. I don't know how to see
> what the buf exactly is but I suppose it might be a zero byte.
Aren't you looking for the .value or the .raw property?