C++调用python(三):调用python的类

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本文链接: https://blog.csdn.net/u013419318/article/details/102709733
int test03()
{
    Py_Initialize();//使用python之前,要调用Py_Initialize();这个函数进行初始化
    if (!Py_IsInitialized())
    {
        printf("初始化失败!");
        return 0;
    }

    PyRun_SimpleString("import sys");
    PyRun_SimpleString("sys.path.append('./')");//这一步很重要,修改Python路径


    PyObject * pModule = NULL;//声明变量
    PyObject * pFunc = NULL;// 声明变量
    PyObject * pClass = NULL;//声明变量
    PyObject * pInstance = NULL;

    pModule = PyImport_ImportModule("pythonTest");//这里是要调用的文件名hello.py
    if (pModule == NULL)
    {
        cout << "没找到" << endl;
    }

    // 模块的字典列表
    PyObject* pDict = PyModule_GetDict(pModule);
    if (!pDict) {
        printf("Cant find dictionary./n");
        return -1;
    }

    //获取calc类
    PyObject* pClassCalc = PyDict_GetItemString(pDict, "calc");
    if (!pClassCalc) {
        printf("Cant find calc class./n");
        return -1;
    }

    //构造Person的实例
    PyObject* pInstanceCalc = PyInstanceMethod_New(pClassCalc);
    if (!pInstanceCalc) {
        printf("Cant find calc instance./n");
        return -1;
    }
    
    PyObject* pRet = PyObject_CallMethod(pClassCalc,"add","10","10", pInstanceCalc);
    if (!pRet)
    {
        printf("不能找到 pRet");
        return -1;
    }

    int res = 0;
    PyArg_Parse(pRet, "i", &res);//转换返回类型
    
    cout << "res:" << res << endl;//输出结果

    //释放
    /*Py_DECREF(pClassCalc);
    Py_DECREF(pInstanceCalc);
    Py_DECREF(pModule);*/
    Py_Finalize(); // 与初始化对应
    system("pause");
    return 0;
}

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转载自blog.csdn.net/u013419318/article/details/102709733