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Thu Mar 7 14:53:14 CET 2013 · https://mail.python.org/pipermail/python-dev/2013-March/124656.html

>         ctypes seems to auto-convert arguments when argtypes is
>         specified. This
>         fact is documented. However, I'm not sure whether this
>         auto-conversion
>         is advanced enough to apply byref. Because otherwise, DIRENT is
>         certainly not convertible to DIRENT_p
>
>     If argtypes specify a 'POINTER(X)' type as an argument, then ctypes
>     automatically applies byref() if an 'X' instance is passed to the
>     actual call.  This is by design, but I'm not sure if it is documented
>     or not.
>
>     However, if argtypes is not given, this does (and of course cannot)
>     work.
>
> Great, thanks for confirming this, Thomas. I had the feeling it's a
> documentation issue (hence I sent it to the docs@ list first), because
> the behavior seems very deliberate and looking at the code of ctypes I
> did see conversions going on.
>
> Have I missed that this is documented somewhere, or should I open a docs
> issue?

I didn't find anything in the docs (in the two minutes I spent for 
that), so please open a docs issue, or, better, fix it.

Thomas

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[Python-Dev] [docs] undocumented argtypes magic in ctypes?