Passing complex numbers into C++

[Achim Domma]

Hi,

do you know boost.python ? (www.boost.org)

Achim

"Andrew Gregory" <andrew.gregory at npl.co.uk> wrote in message
news:2830c89c.0205270828.ea3406 at posting.google.com...
> I am trying to produce a bit of code to illustrate how complex numbers
> can be passed to / from C++ (BCC5.5).  I'm new to this, and finding it
> hard going. The following bit of code compiles to complx.pyd  - which
> imports into python ok, but if I use the csqr() function it causes a
> crash. If anyone can tell me why I would be grateful,
> Andrew.
>
> / Example hand-coded C++ interface to Python
>
> #include <Python.h>
> #include <complex.h>
> typedef complex<double> dcomplex;
>
>
> // **** Function (illustrative) ****
>
> Py_complex csqr(Py_complex r)
> {
>  static Py_complex P;
>  dcomplex t = dcomplex(r.real, r.imag);
>  t = t*t;
>  P.real = real(t);
>  P.imag = imag(t);
>  return P;
> };
>
>
> // **** Wrapper ****
> PyObject *wrap_csqr(PyObject *self, PyObject *args)
> {
> Py_complex r, result;
>        // r = new Py_complex;
> if (!PyArg_ParseTuple(args,"D:csqr", &r)) return NULL;
> //result = r;
>     return Py_BuildValue("D",&r);
> };
>
>
> static PyMethodDef exampleMethods[] =
> {
> { "csqr", wrap_csqr, 1 }, {NULL, NULL}
> };
>
>
> // Must use this for C++
> #ifdef __cplusplus
> extern "C" {
> #endif
>
> void initcomplx()
> {
> PyObject *m;
> m = Py_InitModule("complx",exampleMethods);
> };
>
> #ifdef __cplusplus
> }
> #endif