Modifying Python parms passed to C function?

[www.nkn.net]

I've been creating some C extension functions, and up until now have used
dictionaries to mimic C-style structs. Since dictionaries are returned as a
borrowed reference from PyArgs_ParseTuple I've been able to modify the
dictionary and return results back to Python.

Now I'm running into a problem with 'basic' types, such as ints and floats.
What I want to do is essentially mimic a functions like this:

int    myFunc(int *parm1, float *parm2)
{
    *parm1 = ...
    *parm2 = ...

    return 1;
}

Looking over the Python C API, I can see no way of pulling this off.  If I
extract the two params into a native int and float type with
PyArgs_ParseTuple, then of course any mods I make to those variables are
within my local stack frame, and do not affect the passed parameters.  I can
instead ask PyArgs_ to parse out the PyIntObject and PyFloatObject params as
Python objects, but I can see no way to assign a new value into these using
the C API.  This seems like such a basic necessity that I'm sure I'm simply
overlooking it in the documentation. Can anyone point me in the right
direction?

Rich