C Wrapper Function, crashing Python?

[Java and Swing]

one more update...

if I remove PyMem_Free and free(...) ...so no memory clean up...I can
still only call doStuff 4 times, the 5th attemp crashes Python.

Java and Swing wrote:
> update:
> if I use C's free(result), free(a) free(b) instead of PyMem_Free...I
> only get one successfuly use/call of doStuff.
>
> i.e.
> // this works
> doStuff(...)
>
> // python crashes here
> doStuff(...)
>
> Java and Swing wrote:
> > static PyObject *wrap_doStuff(PyObject *self, PyObject *args) {
> > 	// this will store the result in a Python object
> > 	PyObject *finalResult;
> >
> > 	// get arguments from Python
> > 	char *result = 0;
> > 	char *in= 0;
> >     	char *aString = 0;
> > 	char *bString = 0;
> > 	MY_NUM *a;
> > 	MY_NUM *b;
> > 	int ok = PyArg_ParseTuple(args, "sss", &in, &aString, &bString);
> > 	if (!ok) return 0;
> >
> > 	// do work to get a and b
> > 	// count - returns an int;  GetVal - returns a char *
> > 	a = GetVal(aString, count(aString, ","));
> > 	b = GetVal(bString, count(bString, ","));
> >
> > 	// make function call, which returns a char *
> > 	result = doStuff(in, a, b);
> >
> > 	// save result in Python string
> > 	finalResult = PyString_FromString(result);
> >
> > 	// free memory
> > 	PyMem_Free(result);
> > 	PyMem_Free(a);
> > 	PyMem_Free(b);
> >
> > 	// return the result as a Python string
> > 	return finalResult;
> > }
> >
> > ...from python I can call this function 4 times...works fine.  WHen I
> > call it for the fifth time python.exe crashes.  im thinking some memory
> > problem in the wrapper function perhaps...but I am not sure.  The
> > actually C function, doStuff can be called 5, 6,7...N times without a
> > problem
> > so i know its gotta be my wrapper.
> > 
> > Any ideas?  Thanks!