[Boost-users] BOOST pass an object to python code

From: alex_at_[hidden]
Date: 2007-08-15 22:27:25

Hello,
  I am new in this list.  I would like to ask a quesiton about the linkage
between BOOST and Python.  I want to use C++ to trigger a Python code so that
when I change anything inside Python, my C++ can know the changes and get the
result back.

  So how can I pass an object from C++ to Python?  and return the result?
Here is the code that embedded the Class.

class CppClass {
public:
  int getNum() {
    return 7;
  }
};

#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["CppClass"] = class_<CppClass>("CppClass")
                               .def("getNum",&CppClass::getNum);
    handle<> ignored(( PyRun_String( ""cpp = CppClass()\n"
                                     "print cpp.getNum()\n"",
                                     Py_file_input,
                                     main_namespace.ptr(),
                                     main_namespace.ptr() ) ));
  } catch( error_already_set ) {
    PyErr_Print();
  }
}

Thanks