Stuck building a Python extension

[David Hughes]

I'm nearly there building a Python extension module to access a set of 
functions in a .dll, but I'm getting an unresolved external error for one 
of the function calls (using MS Visual C++ V6).

The function prototype is:

extern short __stdcall SharewareLimit(char * s1, char * s2, short i);

which I'm calling from:

static PyObject *oneway_SharewareLimit(self, args)
    PyObject *self;    /* Not used */
    PyObject *args;
{
    char * company;
    char * software;
    short evalperiod;
    short expired;

    if (!PyArg_ParseTuple(args,"ssh:SharewareLimit",&company ,&software, 
&evalperiod))
        return NULL;

    expired =  SharewareLimit(company ,software, evalperiod);

    return Py_BuildValue("h",expired);
}

I would expect the code to be calling a function called _SharewareLimit at 10 
to match the size of the arguments (and which I have called successfully 
from a Fortran program in the past), but the unresolved external is 
_SharewareLimit at 12, implying that somewhere the short 2-byte integer is 
being promoted to 4 bytes.

I know this is probably a C compiler (settings?) not a Python problem, but 
I'd appreciate some assistance as my knowledge in this area is sketchy.

Thanks, David.