python call c++ function code example

Example: c++ call python function

#include <Python.h>
#include <stdlib.h>

int main() {
   // Set PYTHONPATH TO working directory
   setenv("PYTHONPATH",".",1);

   PyObject *pName, *pModule, *pDict, *pFunc, *pValue, *presult;

   // Initialize the Python Interpreter
   Py_Initialize();

   // Build the name object
   pName = PyString_FromString((char*)"arbName");

   // Load the module object
   pModule = PyImport_Import(pName);

   // pDict is a borrowed reference 
   pDict = PyModule_GetDict(pModule);

   // pFunc is also a borrowed reference 
   pFunc = PyDict_GetItemString(pDict, (char*)"someFunction");

   if (PyCallable_Check(pFunc)) {
       pValue=Py_BuildValue("(z)",(char*)"something");
       PyErr_Print();
       printf("Let's give this a shot!\n");
       presult=PyObject_CallObject(pFunc,pValue);
       PyErr_Print();
   } 
   else 
       PyErr_Print();
  
   printf("Result is %d\n",PyInt_AsLong(presult));
   Py_DECREF(pValue);

   // Clean up
   Py_DECREF(pModule);
   Py_DECREF(pName);

   // Finish the Python Interpreter
   Py_Finalize();
  
   return 0;
}