Hi,
I was being researching the Boost.Python library, this archive and
stackoverflow but I couldn't find the correct answer.
I tried the following:
-First: I created the C++ Class.
--------------------------------------------------------------------------
user@host ~/ProjectFolder: cat lib/DemiComponent.hpp
#pragma once
#include <boost/python.hpp>
namespace DemiWu
{
class Component
{
public:
Component(){};
virtual ~Component(){};
virtual void on_create(){};
};
class ComponentWrap : public Component, public
boost::python::wrapper<Component>
{
public:
void empty(){}
virtual void on_create()
{
this->get_override("on_create")();
}
};
void import_component()
{
using namespace DemiWu;
using namespace boost::python;
class_<ComponentWrap, boost::noncopyable>("Component")
.def("on_create", &Component::on_create, &ComponentWrap::empty);
};
};
--------------------------------------------------------------------------
-Second: I exported to Python
--------------------------------------------------------------------------
user@host ~/ProjectFolder: cat lib/DemiWu.hpp
#pragma once
#include <boost/python.hpp>
#include <DemiComponent.hpp>
BOOST_PYTHON_MODULE(DemiWu)
{
DemiWu::import_component();
}
--------------------------------------------------------------------------
cat lib/DemiWu.cpp
#include <DemiWu.hpp>
---------------------------
-Third: I used Meson to compile, but I think that is not important. The module
works on python3 interpreter.
--------------------------------------------------------------------------
-Fourth: I wrote a Python Class that inherit form the C++ Class
DemiWu::Component.
--------------------------------------------------------------------------
user@host ~/ProjectFolder: cat build/test.py
import DemiWu
class test(DemiWu.Component):
def __init__(self):
self.x = 10;
self.y = 20;
def on_create(self):
print("(",self.x, ",",self.y,")", sep="")
self.x = self.x + 1
self.y = self.y + 1
--------------------------------------------------------------------------
Fifth: I write a program that extracts the test Python Class.
--------------------------------------------------------------------------
user@host ~/ProjectFolder: cat src/DemiWu.cpp
#include <boost/python.hpp>
#include <DemiComponent.hpp>
#include <DemiWu.hpp>
#include <iostream>
using namespace boost::python;
using namespace DemiWu;
int main()
{
PyImport_AppendInittab("DemiWu", PyInit_DemiWu);
Py_Initialize();
object main = import("__main__");
object global = main.attr("__dict__");
PySys_SetPath(L".");
global["test"] = import("test");
object obj = eval("test.test()", global);
extract<Component*> ex(obj);
if(ex.check()){
Component* b=ex();
b->on_create();
std::cout << "SUCCESS\n";
return 0;
} else {
std::cout << "FAIL\n";
return 1;
}
}
--------------------------------------------------------------------------
Sixth: Compile the program successfully.
--------------------------------------------------------------------------
Seventh: Execute and... the output is always "FAIL".
--------------------------------------------------------------------------
How can I fix it? What did I miss?
Thank you for your attention,
Carlos
PS: Sorry for the format of the mail, but I can't express on English well._______________________________________________
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