Deallocating Memory For Objects Returned To Python Through Ctypes

I am using ctypes for extending my c functions in MyDll to python. from ctypes import cdll libX = cdll.LoadLibrary('d:\\MyTestProject\\debug\\MyDll.dll') further in the .py file

Solution 1:

I typically handle this by adding an extern destroy object function that I can pass the pointer back to and delete it.

CPP:

SomeClass* createObj()
{
    returnnewSomeClass();
}

voiddestroyObj(SomeClass* pObj){
  delete pObj;
  pObj = NULL;
}

H:

extern"C" {
  SomeClass* createObj();
  voiddestroyObj(SomeClass*);
}

PY:

classSomeObj:def__init__(self):
        self.soLib = cdll.LoadLibrary(PATH_SO)
        _createObj = self.soLib.createObj
        _createObj.restype = POINTER(c_long)

        self._objRef = _createObj()
        ## do stuff with self._objRefdef__del__(self):
        self.soLib.destroyObj(self._objRef)