[Tutor] Problems working with the function PyArg_Parse

[Jörg Wölke]

> Hi !
> 
> I want to convert a python script return value (9,2034) to c. It´s a 
> double and it seems that i use the function PyArg_Parse in the the wrong 
> way.
> Here' s the code:
>    
>   ...
>   double *cstr;
>   PyObject *pmod, *pargs, *pmeth, *pres;
>   ...
>   pres = PyEval_CallObject(pmeth, pargs);        
>   Py_DECREF(pmeth);
>   Py_DECREF(pargs);
>   if (pres == NULL)
>       error("Error calling para()");
>   if (!PyArg_Parse(pres, "i", &cstr))               /* convert to C */
>      error("Can't convert para() result");
>   printf("%d\n", cstr);
            ^^
printf("%f\n", cstr);

>   Py_DECREF(pres);
> 
> Perhaps anyone can tell me to use the options (pres, "i", &cstr) in the 
> right way. I only get a "9" ,but not 9,2034.
> 
> Greetings
> Marcus

HTH and Greetings, 
J"o!

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