On 19/05/2012 10:30, Johannes Bauer wrote:
Even the example in the standard library fails:
import ctypes
libc = ctypes.cdll.LoadLibrary("/lib64/libc-2.14.1.so")
print(libc.strchr("abcdef", ord("d")))
Always returns "0".
I think there may be two problems with this code:
(1) You are using a 64-bit system but, in the absence of a function
prototype for strchr, ctypes will be passing and returning 32-bit types.
To add prototype information put something like:
libc.strchr.restype = ctypes.c_char_p
libc.strchr.argtypes = [ctypes.c_char_p, c_int]
before the call of strchr().
(2) In Python3 strings are not plain sequences of bytes by default. In
your example try passing b"abcdef" instead of "abcdef".
-- CMcP
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