C++调python(执行py文件)

1、首先要配好vs开发工程

注意版本；我这使用32位的python那么我vs工程这边也选择32位的编译环境去配置
注意点；需要将python安装目录的一些文件拷过来作为vs工程使用。

2、C++调用Python结果

py代码

这里引用了cdll库也需要放置到运行目录，py文件也是需要放置到运行目录(也就是exe生成所在目录)

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.GetAndSetStringGetAndSetString.restype = c_char_pGetAndSetString.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()

C++代码

#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Test001.py中的Hello函数..." << endl;Hello();cout << "\n调用Test001.py中的Add函数..." << endl;Add();*/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();
}

3、报错：ValueError: source code string cannot contain null bytes

参考链接:
https://blog.csdn.net/LaoYuanPython/article/details/97623504 Python中import模块时报SyntaxError: (unicode error)utf-8 codec can not decode 错误的解决办法
https://blog.csdn.net/zichen_ziqi/article/details/79068656 混合编程之——C++调用python2.7&python3.5

4、C++调用python文件中import时报错

参考链接：
https://blog.csdn.net/m0_38125278/article/details/87191971?spm=1035.2023.3001.6557&utm_medium=distribute.pc_relevant_bbs_down.none-task-blog-2_defaultOPENSEARCH_{default-17.nonecase&depth_1-utm_source=distribute.pc_relevant_bbs_down.none-task-blog-2}default_OPENSEARCHdefault-17.nonecase C++通过内嵌解释器调用Python及间接调用Python三方库

5、C++多线程调用Python多进程multiprocessing时发现不支持

https://blog.csdn.net/michael2008bj/article/details/51184326 C++多线程调用Python多进程

6、C++调用python文件中的线程以及字符串在C++和python中间的传递

参考链接：
https://blog.csdn.net/qq_32716885/article/details/86289696
python代码

import os
import threading
import timeg_flage = 0def thread_test():while(True):if g_flage == False:print('循环代码段区域')else:breakdef Hello(str):print("%s" % str)return "PythonGoC++"def Add(a, b):return a+bdef Begin_voice():print('开启线程!')global g_flageg_flage = Falsep = threading.Thread(target=thread_test)p.start()def End_voice():print('关闭线程！')global g_flageg_flage = True

C++代码

#include <iostream>
#include "Python.h"
#include <thread>
using namespace std;
void Hello();
void Add();
void Hello1()
{cout << "\n调用Test001.py中的Add函数..." << endl;
}
std::thread         *m_pVideoThread = NULL;
PyObject * pModule = NULL;
void Start()
{PyObject * pFunc = NULL;PyObject * pFunc2 = NULL;//Py_SetPythonHome(L"D:\\code\\pythonTestCDll\\CdoPython\\Release");Py_Initialize();//调用Py_Initialize()进行初始化if (!Py_IsInitialized()) {printf("Python envirment initialized fale!");return;}PyRun_SimpleString("import sys");PyRun_SimpleString("sys.path.append('D:/code/pythonTestCDll/CdoPython/Release/DLLs')");//PyRun_SimpleString("sys.path.append('D:/code/pythonTestCDll/CdoPython/Release/Lib')");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, "Begin_voice");//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.
}
int main(int argc, char* argv[])
{cout << "调用Test001.py中的Hello函数..." << endl;Hello();cout << "\n调用Test001.py中的Add函数..." << endl;Add();cout << "调用testMultiprocessingDll.py中的Start函数..." << endl;m_pVideoThread = new std::thread(Start);//Start();_sleep(1000);PyObject * pFunc2 = NULL;pFunc2 = PyObject_GetAttrString(pModule, "End_voice");//调用的函数名PyEval_CallObject(pFunc2, NULL);//调用函数,NULL表示参数为空getchar();return 0;
}
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PyObject *pArgs = PyTuple_New(1);//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("s", "C++DoPython"));//0--序号,i表示创建int型变量PyObject *pReturn = NULL;//PyEval_CallObject(pFunc, NULL);//调用函数,NULL表示参数为空pReturn = PyEval_CallObject(pFunc, pArgs);string result;PyArg_Parse(pReturn, "s", &result);//i表示转换成int型变量printf("%s", result);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();
}