I have a C++ GUI, it load a DLL when running. I use SIP to import the DLL in python. I need to embed the python part in the GUI, and some data are needed to exchange between python and C++. 
For example, in the C++ GUI, I can enter command from a panel, such as "drawSomething()", it will call corresponding function in python, and the result will be shown in the GUI.
Can I use SIP to 
extract a C++ object from python object (just like the way boost.python does), or is there a better way to share data between python and c++ seamlessly?
thanks.
It turns out that I do not need to do anything complicated...
In my case, there is no difference to call functions in DLL from C++ or from python code embedded in C++.
I am totally over-thinked.
python-sip: How to access a DLL from both Python and C++