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,  <> 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[24] will cause an "index out of range" error. I don't know how to see what 
the buf[24] exactly is but I suppose it might be a zero byte.


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