[Tutor] What's wrong with this code ?

[Sebastien Auclair]

See code example below !

We are embeding python and our C++ software is trying to get a C++ pointer
to a C++ object instantiated in a python module.
This python Class "MyClass" is a sub-class of the C++ "An_Insterface*" class
declared in  library "A_Lib" that is of course accessible through SIP
bindings.


The few CPP lines :
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
An_Interface* m_interface = NULL;

 PyObject *mdict = NULL;
 PyObject *func1 = NULL;
 PyObject * v1 = NULL;
 PyObject * sipClass;
 int bErrorOccured = 0;

   initlibsip();

   mdict = PyModule_GetDict(m_pylib); // m_pylib is the compiled python
file... this isvalid...It was tested.
   func1 = PyDict_GetItemString(mdict, "CreateInstance"); // The function
that returns an instance of the desired class. (as a pointer)
   v1 = PyObject_CallObject(func1,NULL); // v1 will then contain some value
other than NULL

   if (v1 == Py_None || sipIsSubClassInstance(v1,sipClass)){
            //  Interesting !! This (if) test will always be FALSE (For
both)
   }
    /////          HERE ARE THE CONVERSION ATTTEMPS !!!!!!!!!!!!!!
   m_interface = (An_Interface*)sipConvertToCpp
(v1,sipClass,&bErrorOccured);    // returns NULL with bErrorOccured == 1
  m_interface =  sipForceConvertTo_An_Interface(v1, &bErrorOccured);   //
Returns NULL with bErrorOccured == 1
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Of course, the two last lines are both trying to do the same thing. It
isjust to show you what we tried.


The python file, in short, looks like this :
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

def CreateInstance(  ):
    return MyClass ()

class MyClass (A_Lib.An_Interface):
        def __init__(self):
                A_Lib.An_Interface.__init__(self)
 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>