boost-python - call c++ methods within another method with embedded Python ?

From: Nicholas Yue (yue.nicholas_at_[hidden])
Date: 2024-06-28 05:51:54

Hi

  I am trying to add an ability to allow for the calling of methods within
a another method that is running an embedded python but I get an error
saying "TypeError: No Python class registered for C++ class MyClass".

#include <boost/python.hpp>

class MyClass
{
public:
  MyClass() = default;
  void method1();
  void method2();
  void executePython();
};

#include <iostream>

void MyClass::method1()
{
  std::cout << "Method 1 called" << std::endl;
}

void MyClass::method2()
{
  std::cout << "Method 2 called" << std::endl;
}

void MyClass::executePython()
{
  try
  {
    Py_Initialize();

    // Expose the current instance (self) to the embedded Python script
    boost::python::object main_namespace;
    main_namespace["self"] = boost::python::ptr(this);

    // Execute Python code that calls method1 and method2 on self
    boost::python::exec("self.method1()\nself.method2()", main_namespace);

    Py_Finalize();
  }
  catch (boost::python::error_already_set&)
  {
    PyErr_Print();
  }
}

int main()
{

  MyClass mc;

  mc.executePython();

  return 0;
}

-- 
Nicholas Yue
https://www.linkedin.com/in/nicholasyue/