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[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. --Jach -- https://mail.python.org/mailman/listinfo/python-list
