Re: [Swig-user] C++ object modifiy in the script

[Oliver B. <oli...@go...>]

Small addition: of course you can create wrapper instances by yourself. 
Maybe this is what you need.
Have a look at generated wrapper code, specifically the constructor 
wrappers.
Then you'll know how to do it...

Regards,
Oliver


On 05/04/2012 02:26 PM, Oliver Buchtala wrote:
> Hi Yoann,
>
> Bob gave you all necessary hints to solve this.
> Though, what you want to achieve is somewhat out of SWIG's typical usage.
> Usually, C/C++ code is wrapped into a target language to be used from 
> there.
> Nonetheless, there is support for the other direction, too, which is 
> called 'director'.
> The feature allows to extend C++ base classes from within the target 
> language, e.g., extend a C++ class with a Python class. For that, code 
> is generated which could be useful for you.
>
> You need to delve into this topic - though, that is advanced stuff. 
> Then find out how to make use of it in your application.
>
> Regards,
> Oliver
>
> On 05/04/2012 02:05 PM, Yoann Chaumy wrote:
>> Hi,
>>
>> Yes, I have read the swig documentation.
>>
>> I have created a simple C++ class, and can successfully use it in my 
>> python scripts
>>
>> But my aim is to create a C++ instance, and pass it to my python 
>> script. The script will modify the instance and return it to the C++ 
>> application.
>>
>> I have progress, now my main call a function in my Python script :
>>
>>
>>     PyObject *pName, *pModule, *pDict, *pFunc, *pValue;
>>     PyObject *pClass, *pInstance, *pArgs;
>>
>>     // Initialize the Python Interpreter
>>     Py_Initialize();
>>
>>     // Build the name object
>>     pName = PyString_FromString("Perso");
>>
>>     if(pName == NULL)
>>       cout<< "error" << endl;
>>
>>     // Load the module object
>>     pModule = PyImport_Import(pName);
>>
>>     if(pName == NULL)
>>        cout<< "error" << endl;
>>
>>     // pDict is a borrowed reference
>>     pDict = PyModule_GetDict(pModule);
>>     if(pDict == NULL)
>>         cout<< "error" << endl;
>>
>>     // pFunc is also a borrowed reference
>>     pFunc = PyDict_GetItemString(pDict, "test");
>>     if(pFunc == NULL)
>>         cout<< "error fonction" << endl;
>>
>>     if (PyCallable_Check(pFunc))
>>     {
>>         pArgs = PyTuple_New(1);                     // create list of arg
>>         pValue = PyInt_FromLong(123);
>>         PyTuple_SetItem(pArgs, 0, pValue);
>>         PyObject_CallObject(pFunc, pArgs);
>>     } else
>>     {
>>         PyErr_Print();
>>     }
>>
>>      // Clean up
>>     Py_DECREF(pModule);
>>     Py_DECREF(pName);
>>
>>     Py_Finalize();
>>
>>
>> Now I can send parameter to my script but it is a integer, and my aim 
>> is to send a instance, is it possible ?
>> I have try to use Py_BuildValue to cast my object into PyObject but 
>> no success
>> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>>
>> Well, it's certainly one way to execute an external Python script 
>> from C++.  However, if you are wanting to interact with the external 
>> script from within the C++ code that manages the Python environment 
>> (above), then the process is considerably more involved.
>>
>> I assume that, since you've posted this question to the SWIG mailing 
>> list, you are implicitly asking about using SWIG to accomplish this 
>> task.  Have you read the SWIG documentation for Python 
>> <http://www.swig.org/Doc2.0/Python.html#Python>?  In particular, 
>> you'll probably want to employ directors 
>> <http://www.swig.org/Doc2.0/Python.html#Python_nn34>.
>>
>> You'll better help us help you if you are at least somewhat familiar 
>> with the process of using SWIG to achieve your goal.
>>
>>
>> Render me gone,                       |||
>> Bob                                 ^(===)^
>> ---------------------------------oOO--(_)--OOo---------------------------------
>>      I'm not so good with advice...can I interest you in a sarcastic comment?
>>
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