C++调用Python-6：调用Python类

 

# mytest.py

class Test:
    def hello(self):
        print("this is test class hello function no params return 123")
        return 123

    def myadd(self, x, y):
        print("this is test class myadd function params x y return x+y")
        print(f'{x}--{y}')
        return x + y

 

#include "Python.h"
#include <iostream>
using namespace std;

int main(int argc, char* argv[])
{
    Py_Initialize();
    if (!Py_IsInitialized())
    {
        cout << "初始化失败" << endl;
    }
    
    PyRun_SimpleString("import sys");
    PyRun_SimpleString("sys.path.append('./')");

    PyObject* pModel = nullptr;
    pModel = PyImport_ImportModule("mytest");


    PyObject* pDict = PyModule_GetDict(pModel);

    // 获取 Test 类，及实例
    PyObject* pTestClass = PyDict_GetItemString(pDict, "Test");
    PyObject* pTest = PyObject_CallObject(pTestClass, nullptr);

    // 调用类方法 hello
    PyObject* hello = PyObject_CallMethod(pTest, "hello", "", "");
    int helloRes = PyLong_AsLong(hello);
    Py_DecRef(hello);
    cout << "class hello is:" << helloRes << endl;

    // 调用类方法 myadd
    PyObject* myadd = PyObject_CallMethod(pTest, "myadd", "(ii)", 456, 123);
    int myaddRes = PyLong_AsLong(myadd);
    Py_DecRef(myadd);
    cout << "class myadd is:" << myaddRes << endl;
    

    Py_DecRef(pTest);
    Py_DecRef(pTestClass);
    Py_DecRef(pDict);
    Py_DecRef(pModel);

    Py_Finalize();
    return 0;
}