"Memory could not be Read/Written" crashes with C extension DLL... HELP PLEASE!

[Brian Quinlan]

> What is the difference though, shouldn't the code below work too?  Is
> there maybe something wrong in the PyTuple code?  (As mentioned
> before, it only crashed when called multiple times (40+ usually), but
> worked fine otherwise.

PyTuple_SetItem does not increment the reference count of the object.
That's exactly what you want for pLong* but probably not for inBuffer
(you didn't show enough code for me to be sure). 

You should develop with a debug version of Python. That way you will see
the reference count after each command you type in the interactive
shell. 

Cheers,
Brian

> 
> >   // build pp1, inBufferSize, pp3 into PyObjects for returning
> >   pLong1 = PyLong_FromLong(pp1);
> >   pLong2 = PyLong_FromLong(inBufferSize);
> >   pLong3 = PyLong_FromLong(pp3);
> >
> >   // build pLong1, pLong2, pLong3, pString into a tuple to return
> >
> >   pReturn = PyTuple_New(4);
> >   PyTuple_SetItem(pReturn, 0, pLong1);
> >   PyTuple_SetItem(pReturn, 1, pLong2);
> >   PyTuple_SetItem(pReturn, 2, pLong3);
> >   PyTuple_SetItem(pReturn, 3, inBuffer);
> >
> >   return pReturn;
> > }
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