Python embed into C++

Question

I have python codes ebmedded into C++. Do I need to release memory(Py_XDECREF) PyObject* pValue and PyObject *pArgs?

When I do Py_XDECREF(pArgs) and Py_XDECREF(pValue) I have Segmentation Fault (Core dumped). I think python side is still using those variables and c++ try to release memory. What is the best practice for this issue?

for(int i=0; i < 100: i++){
 .......do sth.......
 if (pModule != NULL) {
 std::string st = jps.updateZone(worldx_y, lenVect); 
 PyObject* pValue = PyBytes_FromString(st.c_str());
 if (pFunc_insert && PyCallable_Check(pFunc_insert)) {
 PyObject *pArgs = PyTuple_New(1);
 PyTuple_SetItem(pArgs, 0, pValue);
 PyObject_CallObject(pFunc_insert, pArgs); 
 Py_XDECREF(pArgs); 
 } 
 Py_XDECREF(pValue); 
 }
 ......do sth.......
}

Answer 1

PyTuple_SetItem steals a reference to the item. You don't need to decref the item, because you no longer own a reference to it. You do need to decref the tuple.

If you still get segfaults after that, you have some other bug.

• batuman: You meant I do not need for both pValue and pARGs?