Can I use generated swig code to convert C++ object to PyObject?
I'm working on embedding python into my C++ program using swig. At the moment I have a object written in C++ which I want to pass to a python function. I've created the swig interface to wrap the class.
What I'm trying to do is take this C++ object which I've created and pass it to a python function with the ability to use it like I would in C++. Is it possible for me to use code generate by swig to do this? If not how can I approach this?
You can use PyObject_CallMethod to pass a newly created object back to python. Assuming ModuleName.object is a python object with a method called methodName that you want to pass a newly created C++ object to you want to roughly (from memory, I can't test it right now) do this in C++:
int callPython() {
PyObject* module = PyImport_ImportModule("ModuleName");
if (!module)
return 0;
// Get an object to call method on from ModuleName
PyObject* python_object = PyObject_CallMethod(module, "object", "O", module);
if (!python_object) {
PyErr_Print();
Py_DecRef(module);
return 0;
}
// SWIGTYPE_p_Foo should be the SWIGTYPE for your wrapped class and
// SWIG_POINTER_NEW is a flag indicating ownership of the new object
PyObject *instance = SWIG_NewPointerObj(SWIG_as_voidptr(new Foo()), SWIGTYPE_p_Foo, SWIG_POINTER_NEW);
PyObject *result = PyObject_CallMethod(python_object, "methodName", "O", instance);
// Do something with result?
Py_DecRef(instance);
Py_DecRef(result);
Py_DecRef(module);
return 1;
}
I think I've got the reference counting right for this, but I'm not totally sure.
链接地址: http://www.djcxy.com/p/48328.html上一篇: 在Python中生成常量