How to call C function in shared library?

[Oleg Krivosheev]

Kalle Svensson <kalle at gnupung.net> writes:

> Sez Oleg Krivosheev:
> > i already have shared library
> > with simple function which takes double
> > and returns double. Is it simple way 
> > to call it directly from Python?
> 
> You could take a look at SWIG (http://www.swig.org/), or make your own
> wrapper.  Something like (extremely untested):
> 
> /************  BEGIN **************/
> #include "Python.h"
> #include "myheader.h"
> 
> static PyObject *
> wrap_myfunction(PyObject *self, PyObject *args)
> {
>     double arg, ret;
>     if (!PyArg_ParseTuple(args, "d", &arg))
>         return NULL;
>     ret = myfunction(arg);
>     return Py_BuildValue("d", ret);
> }
> 
> /* Module initialisation stuff goes here...     */
> /* Check http://www.python.org/doc/current/ext/ */
> /* and http://www.python.org/doc/current/api/   */
> /* for more information...                      */
> /************  END **************/
> 
> > Or some python encapsulation for dlopen/dlsym/dlclose ?
> 
> There is the dl module:
> http://www.python.org/doc/current/lib/module-dl.html

umm...

it doesn't support double it seems...

thanks anyway

OK