Re: How to get binary data to callback function

Nikolaus Rath <[email protected]> writes:
> "Martin (gzlist)" <[email protected]> writes:
>> On 22/12/2009, Nikolaus Rath <[email protected]> wrote:
>>>
>>> When I define a callback function with a prototype of
>>>
>>>    ctypes.CFUNCTYPE(None, ctypes.c_char_p, ctypes.c_int)
>>
>> You have the prototype wrong, c_char_p is for null-terminated strings:
>>
>> <http://docs.python.org/library/ctypes.html#ctypes.c_char_p>
>>
>> You want to use `ctypes.POINTER(ctypes.c_char)` instead for the definition.
>
> Ah, tricky. Thanks for helping out. I have just submitted a doc patch to make
> this more clear (http://bugs.python.org/issue7569).

This actually leads to a new question. How can I construct a
POINTER(c_char)? c_char_p('string') works nicely, but
POINTER(c_char)('string') raises a TypeError.

What's the trick that I need here?


Thanks,

   -Nikolaus

-- 
 »Time flies like an arrow, fruit flies like a Banana.«

  PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6  02CF A9AD B7F8 AE4E 425C


------------------------------------------------------------------------------
This SF.Net email is sponsored by the Verizon Developer Community
Take advantage of Verizon's best-in-class app development support
A streamlined, 14 day to market process makes app distribution fast and easy
Join now and get one step closer to millions of Verizon customers
http://p.sf.net/sfu/verizon-dev2dev 
_______________________________________________
ctypes-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/ctypes-users