[Python-3000] py3k-struni: proposition to fix ctypes bug, ctypes c_char creates bytes

[Victor Stinner]

Hi,

I hear Guido's request to fix last py3k-struni bugs. I downloaded subversion 
trunk and started to work on ctypes tests.

The problem is that ctypes c_char (and c_char_p) creates unicode string 
instead of byte string. I attached a proposition (patch) to change this 
behaviour (use bytes for c_char).

So in next example, it will display 'bytes' and not 'str':
  from ctypes import c_buffer, c_char
  buf = c_buffer("abcdef")
  print (type(buf[0]))

Other behaviour changes:
 - repr(c_char) adds a "b"
   eg. repr(c_char('x')) is "c_char(b'x')" instead of "c_char('x')"
 - bytes is mutable whereas str is not: 
   this may break some modules based on ctypes

Victor Stinner aka haypo
http://hachoir.org/
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