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8.4

C++ call Python code

Asked by goretti in Python Scripting Language, C++ Programming Language

Tags: python, from, call

HELLO
  I would like to run a C++ program that can call a python code which is stored as  a *.py.  so that if I make any changes inside *.py, my C++ program can get the results.
In my code, I have a class CppClass and an object created from this class called cpp.
How can I pass this object to a *.py file and get the new results?


class CppClass {
public:
  int getNum() {
    return 8;
  }
 // int getNum2(){//
      //return 12;
  //}
};



#include "boost/python.hpp"

using namespace boost::python;

int main( int argc, char ** argv ) {

  try {
    Py_Initialize();


    object main_module((
      handle<>(borrowed(PyImport_AddModule("__main__")))));

    object main_namespace = main_module.attr("__dict__");
      //      main_namespace["cpp"] = ptr(&cpp);
            
      main_namespace["CppClass"] = class_<CppClass>("CppClass")
                               .def("getNum",&CppClass::getNum);
      

      CppClass cpp;
      cpp.getNum();
      
      main_namespace["multiply"] = ptr(&cpp);
 

handle<> ignored(( PyRun_String(  "print multiply.getNum() \n",
                                      Py_file_input,
                                      main_namespace.ptr(),
                                      main_namespace.ptr() ) ));

   

  } catch( error_already_set ) {
    PyErr_Print();
  }
}


multiply.py
def multiply(a,b):
    global c
    print "Will compute", a, "times", b
    c=c+(a*b)
   
    return c
[+][-]08/28/07 11:09 PM, ID: 19789079Accepted Solution

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About this solution

Zones: Python Scripting Language, C++ Programming Language
Tags: python, from, call
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Solution Provided By: mish33
Participating Experts: 3
Solution Grade: A
 
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