On Sat, 19 May 2012 11:30:46 +0200, Johannes Bauer wrote:
> import ctypes
> libc = ctypes.cdll.LoadLibrary("/lib64/libc-2.14.1.so")
> print(libc.strchr("abcdef", ord("d")))
In 3.x, a string will be passed as a wchar_t*, not a char*. IOW, the
memory pointed to by the first argument to strchr() will consist mostly of
NUL bytes.
Either use a "bytes" instead of a string:
> print(libc.strchr(b"abcdef", ord("d")))
1984444291
or specify the argument types to force a conversion:
> libc.strchr.argtypes = [c_char_p, c_int]
> print(libc.strchr("abcdef", ord("d")))
1984755787
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