ctypes from_param() truncating 64 bit pointers to 32 bit

Joakim Hove joakim.hove at gmail.com
Fri Feb 18 11:15:00 CET 2011


On 18 Feb, 10:55, Stefan Krah <stefan-use... at bytereef.org> wrote:
> Joakim Hove <joakim.h... at gmail.com> wrote:
> > > and I actually don't know how this specific case works.
> > > However, you are not providing a function signature for the "print_addr" C
> > > function in the BugTest case, so my guess is that it assumes the standard
> > > signature for C functions, which is "int func(int)". That would explain the
> > > 32bit truncation.
>
> > Well; I think you are wrong. First of all because what I showed in the
> > Stackoverflow post was just a contrived example - the real code where
> > the problem initially arose does indeed have the proper function
> > signature.
>
> I suggest that you reconsider, since this appears to work:
>
>     def from_param(self):
>         return ctypes.c_void_p(self.c_ptr)
>
> Stefan Krah

That works - thank you very much!

Joakim



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