C++代码：

#include <iostream>
class DemoClass{
    private:
        int a, b;
    public:
        DemoClass(int v1, int v2){
            a = v1;
            b = v2;
        }
        void DemoFunction(){
            std::cout << "Hello C++!" << std::endl;
            std::cout << "output: a = " << a << ", b = " << b << std::endl;
        }
};

extern "C" {
    DemoClass* DemoCpp(int v1, int v2){
        return new DemoClass(v1, v2);
    }
    void DemoCppFunction(DemoClass* demo){
        demo->DemoFunction();
    }
}

通过g++ test.cpp -shared -fPIC -o test.so编译c++
Python脚本：

from ctypes import cdll
lib = cdll.LoadLibrary('./test.so')

class CppClass():
    def __init__(self, v1: int, v2: int):
        self.obj = lib.DemoCpp(v1, v2)

    def demoFunction(self):
        lib.DemoCppFunction(self.obj)

f = CppClass(2, 3)
f.demoFunction()

这是我得到的：

Hello C++!
Segmentation fault

我很确定参数传递给了C类。我只是想知道在C类中调用函数的方法。