[C++-sig] C++-sig Digest, Vol 51, Issue 25

[Shrikant Chikhalkar]

Hi,
thanks for the reply.
that i have already tried. Still i am getting same error. could you please
give some pointer that where i am doing wrong.

thanks
Shrikant


On 10/25/07, c++-sig-request at python.org <c++-sig-request at python.org> wrote:
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> Today's Topics:
>
>    1. failed in PyImport_Import() (Shrikant Chikhalkar)
>    2. Re: failed in PyImport_Import() (Gustavo Carneiro)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 25 Oct 2007 12:22:24 +0530
> From: "Shrikant Chikhalkar" <shrikantvc at gmail.com>
> Subject: [C++-sig] failed in PyImport_Import()
> To: c++-sig at python.org
> Message-ID:
>         <87de5f460710242352w5b57dc4djbcfba96ccf0f3578 at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi,
>
> i am tring to call python function from 'C' program. i get NULL value
> return
> by PyImport_Import()
>
> following is the code. code is copied from
> http://www.codeproject.com/cpp/embedpython_1.asp
>
> following file is saved as
>
> call_function.c
>
>
> /************************************************************************************************************/
>
> // call_function.c - A sample of calling
> // python functions from C code
> //
> #include <Python.h>
>
> int main(int argc, char *argv[])
> {
>     PyObject *pName, *pModule, *pDict, *pFunc, *pValue;
>
>     if (argc < 3)
>     {
>         printf("Usage: exe_name python_source function_name\n");
>         return 1;
>     }
>
>     // Initialize the Python Interpreter
>     Py_Initialize();
>
>     // Build the name object
>     pName = PyString_FromString(argv[1]);
>
>     // Load the module object
>     pModule = PyImport_Import(pName);
>
>     // pDict is a borrowed reference
>     pDict = PyModule_GetDict(pModule);
>
>     // pFunc is also a borrowed reference
>     pFunc = PyDict_GetItemString(pDict, argv[2]);
>
>     if (PyCallable_Check(pFunc))
>     {
>         PyObject_CallObject(pFunc, NULL);
>     } else
>     {
>         PyErr_Print();
>     }
>
>     // Clean up
>     Py_DECREF(pModule);
>     Py_DECREF(pName);
>
>     // Finish the Python Interpreter
>     Py_Finalize();
>
>     return 0;
> }
>
>
> /************************************************************************************************************/
> python file saved as
>
> py_function.py
>
>
> /************************************************************************************************************/
>
> '''py_function.py - Python source designed to '''
> '''demonstrate the use of python embedding'''
>
> def multiply():
>     c = 12345*6789
>     print 'The result of 12345 x 6789 :', c
>
>
>     return c
>
>
> /************************************************************************************************************/
>
> $gcc -g call_function.c  -lpython2.5 -ocall_function
> $./call_function py_function.py multiply
>
> i get following output
>
> ImportError: No module named py_function
> Failed to load "py_function"
>
> when i kdbg(debug) it i vet NULL value returned from PyImport_Import()..
>
> can any one please find out the error that i am doing.
>
> --
> Shrikant
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> ------------------------------
>
> Message: 2
> Date: Thu, 25 Oct 2007 08:21:19 +0100
> From: "Gustavo Carneiro" <gjcarneiro at gmail.com>
> Subject: Re: [C++-sig] failed in PyImport_Import()
> To: "Development of Python/C++ integration" <c++-sig at python.org>
> Message-ID:
>         <a467ca4f0710250021x50e0a9c8m5ad849e9b9e3d5b1 at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> On 25/10/2007, Shrikant Chikhalkar <shrikantvc at gmail.com> wrote:
> >
> > Hi,
> >
> > i am tring to call python function from 'C' program. i get NULL value
> > return by PyImport_Import()
> >
> > following is the code. code is copied from
> > http://www.codeproject.com/cpp/embedpython_1.asp
> >
> > following file is saved as
> >
> > call_function.c
> >
> >
> /************************************************************************************************************/
> >
> >
> > // call_function.c - A sample of calling
> > // python functions from C code
> >
> > //
> > #include <Python.h>
> >
> > int main(int argc, char *argv[])
> > {
> >
> >     PyObject *pName, *pModule, *pDict, *pFunc, *pValue;
> >
> >     if (argc < 3)
> >     {
> >         printf("Usage: exe_name python_source function_name\n"
> > );
> >         return 1;
> >     }
> >
> >     // Initialize the Python Interpreter
> >     Py_Initialize();
> >
> >
> > // Build the name object
> >     pName = PyString_FromString(argv[1]);
> >
> >     // Load the module object
> >     pModule = PyImport_Import(pName);
> >
> >
> >     // pDict is a borrowed reference
> >     pDict = PyModule_GetDict(pModule);
> >
> >     // pFunc is also a borrowed reference
> >     pFunc = PyDict_GetItemString(pDict, argv[
> > 2]);
> >
> >     if (PyCallable_Check(pFunc))
> >     {
> >         PyObject_CallObject(pFunc, NULL);
> >     } else
> >     {
> >
> >         PyErr_Print();
> >     }
> >
> >     // Clean up
> >     Py_DECREF(pModule);
> >     Py_DECREF(pName);
> >
> >     // Finish the Python Interpreter
> >
> >     Py_Finalize();
> >
> >     return 0;
> > }
> >
> >
> /************************************************************************************************************/
> >
> > python file saved as
> >
> > py_function.py
> >
> >
> >
> /************************************************************************************************************/
> >
> > '''py_function.py - Python source designed to '''
> > '''demonstrate the use of python embedding'''
> >
> > def multiply():
> >     c = 12345*6789
> >     print 'The result of 12345 x 6789 :', c
> >
> >
> >
> >     return c
> >
> >
> >
> /************************************************************************************************************/
> >
> > $gcc -g call_function.c  -lpython2.5 -ocall_function
> > $./call_function py_function.py multiply
>
>
> Shouldn't this be:
>    $./call_function py_function multiply
>
> I.e., you the module name should not have a .py extension.
>
> i get following output
> >
> > ImportError: No module named py_function
> > Failed to load "py_function"
> >
> > when i kdbg(debug) it i vet NULL value returned from PyImport_Import()..
> >
> > can any one please find out the error that i am doing.
> >
> > --
> > Shrikant
> >
> >
> > _______________________________________________
> > C++-sig mailing list
> > C++-sig at python.org
> > http://mail.python.org/mailman/listinfo/c++-sig
> >
> >
>
>
> --
> Gustavo J. A. M. Carneiro
> INESC Porto, Telecommunications and Multimedia Unit
> "The universe is always one step beyond logic." -- Frank Herbert
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> End of C++-sig Digest, Vol 51, Issue 25
> ***************************************
>



-- 
Shrikant Chikhalkar
+91 9850991554
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