C++ 调用Python文件方法传递字典参数并接收返回值

首先本地需要安装有Python环境，然后在c++工程中包含Python的头文件，引用Python的lib库。

	  //python 初始化
      Py_Initialize();
      if (!Py_IsInitialized())
      {
        return;
      }
	  //运行脚本导入环境变量
      PyRun_SimpleString("import sys");
      PyRun_SimpleString("import os");
      PyRun_SimpleString("import string");
	  //py文件的存放位置
      string strPyPath = string("sys.path.append('") + m_strPyLocation + string("')");
      PyRun_SimpleString(strPyPath.c_str());
      //载入py脚本
      PyObject* pModule = PyImport_ImportModule("pyscript");// PyImport_Import(pName);
      if (!pModule)
      {
        return;
      }
      //获取py方法
      PyObject* pFunc = PyObject_GetAttrString(pModule, "OnFunc"); //PyDict_GetItemString(pDict, "pyscript");
      if (!pFunc || !PyCallable_Check(pFunc))
      {
        return;
      }
	  //构建py方法字典参数
      PyObject *pArgsT = PyTuple_New(1);
      PyObject* pArgsD = PyDict_New();
      PyDict_SetItemString(pArgsD, "key", Py_BuildValue("s", "value"));
      PyTuple_SetItem(pArgsT, 0, pArgsD);
      //调用py方法
      PyObject *pReturn = PyEval_CallObject(pFunc, pArgsT);//PyObject_CallObject(pFunc, pArgs);
      if (pReturn == NULL)
      {
        return;
      }
      //获取py返回值
      PyArg_Parse(pReturn, "s", &szBuffer);//char szBuffer[256] = {0};
      //clear
      Py_DECREF(pName);
      Py_DECREF(pDict);
      Py_DECREF(pModule);
      Py_DECREF(pFunc);
      Py_DECREF(pArgsT);
      Py_DECREF(pArgsD);
      Py_DECREF(pReturn);
      Py_Finalize();

pyscript.py脚本示例

def OnFunc(params):
    ret=''
    ret+=params["key"]
    return ret

附加 返回值 Tuple-List 解析

    //调用py方法
    PyObject *pReturnTuple =PyObject_CallObject(pFunc, pArgsT0); //PyEval_CallObject(pFunc, pArgsT0);
    if (pReturnTuple == NULL)
        return ;

    int nTupleSize = PyTuple_Size(pReturnTuple);
    for (int l = ; l < nTupleSize; l++)
    {
        PyObject *pTupleList = PyTuple_GetItem(pReturnTuple, l);
        int nTupleListSize = PyList_Size(pTupleList);
        for (int m = ; m < nTupleListSize; m++)
        {
            PyObject* pTupleListValue = PyList_GetItem(pTupleList, m);
            int nValue = ;
            PyArg_Parse(pTupleListValue, "i", &nValue);
            std::cout << nValue << std::endl;
        }
    }

在线文档 https://docs.python.org/