C++调用python(执行py文件)的全过程

import os
import time
from ctypes import *


def testDLL():
    pDll = CDLL("./pythonTestCDll.dll")
    pstr = create_string_buffer(1024,  '\0')    # 创建字符串缓冲区
    # 对输入输出参数进行声明
    GetAndSetString = pDll.GetAndSetString
    GetAndSetString.restype = c_char_p
    GetAndSetString.argtypes = [c_char_p]
    pchar = GetAndSetString(pstr)
    szbuffer = c_char_p(pchar)  # 强制转换为c_char_p类型，取其value值
    print(pstr.value)
    print(szbuffer.value)


def Start():
    testDLL()

#include <iOStream>
#include "Python.h"
using namespace std;
void Hello();
void Add();
void Start();
void Hello1()
{
	cout << "\n调用Test001.py中的Add函数..." << endl;
}
int main(int arGC, char* argv[])
{
	
	cout << "调用testMultiprocessingDll.py中的Start函数..." << endl;
	Start();
	getchar();
	return 0;
}
void Start()
{
	Py_Initialize();//调用Py_Initialize()进行初始化
	if (!Py_IsInitialized()) {
		printf("Python envirment initialized fale!");
		return;
	}
	PyObject * pModule = NULL;
	PyObject * pFunc = NULL;
	PyRun_SimpleString("import sys");
	PyRun_SimpleString("sys.path.append('D:/code/pythonTestCDll/CdoPython/Release/DLLs')");
	//PyRun_SimpleString("print(\"sdasd\")");
	pModule = PyImport_ImportModule("testMultiprocessingDll");//调用的Python文件名  py文件放置exe同级
	if (pModule == NULL)
	{
		PyErr_Print();
		cout << "PyImport_ImportModule Fail!" << endl;
		return;
	}
	pFunc = PyObject_GetAttrString(pModule, "__main__");//调用的函数名
	PyEval_CallObject(pFunc, NULL);//调用函数,NULL表示参数为空
	Py_Finalize();//调用Py_Finalize,和Py_Initialize相对应的.
}
void Hello()
{
	Py_Initialize();//调用Py_Initialize()进行初始化
	if (!Py_IsInitialized()) {
		printf("Python envirment initialized fale!");
		return ;
	}
	PyObject * pModule = NULL;
	PyObject * pFunc = NULL;
	PyRun_SimpleString("print(\"sdasd\")" );
	pModule = PyImport_ImportModule("Test001");//调用的Python文件名  py文件放置exe同级
	if (pModule == NULL)
	{
		PyErr_Print();
		cout << "PyImport_ImportModule Fail!" << endl;
		return;
	}
	pFunc = PyObject_GetAttrString(pModule, "Hello");//调用的函数名
	PyEval_CallObject(pFunc, NULL);//调用函数,NULL表示参数为空
	Py_Finalize();//调用Py_Finalize,和Py_Initialize相对应的.
}
//调用Add函数,传两个int型参数
void Add()
{
	Py_Initialize();
	PyObject * pModule = NULL;
	PyObject * pFunc = NULL;
	pModule = PyImport_ImportModule("Test001");//Test001:Python文件名
	pFunc = PyObject_GetAttrString(pModule, "Add");//Add:Python文件中的函数名
												   //创建参数:
	PyObject *pArgs = PyTuple_New(2);//函数调用的参数传递均是以元组的形式打包的,2表示参数个数
	PyTuple_SetItem(pArgs, 0, Py_BuildValue("i", 6));//0--序号,i表示创建int型变量
	PyTuple_SetItem(pArgs, 1, Py_BuildValue("i", 8));//1--序号
													 //返回值
	PyObject *pReturn = NULL;
	pReturn = PyEval_CallObject(pFunc, pArgs);//调用函数
											  //将返回值转换为int类型
	int result;
	PyArg_Parse(pReturn, "i", &result);//i表示转换成int型变量
	cout << "6 + 8 = " << result << endl;
	Py_Finalize();
}