c++之调用python

以下是小可关于c调python的理解有不对之处希望大家指正

vs2015 x64 release
加载python头文件目录 C:ProgramDataAnaconda3pkgspython-3.7.0-hea74fb7_0include
加载python库目录 C:ProgramDataAnaconda3pkgspython-3.7.0-hea74fb7_0libs
链接库 python37.lib
动态库 python37.dll

测试代码

#include 
#include 

int main()
{
	Py_SetPythonHome(L"C:\ProgramData\Anaconda3\");//指定python.exe位置

	Py_Initialize();
	PyRun_SimpleString("print('hello world!')");
	Py_Finalize();
	system("pause");
	return 0;

}

结果如下

hello world!
请按任意键继续. . .

准备hello.py文件

def Add(a, b):
    c = a + b
    return c

def Sub(a, b):
    c = a - b
    return c

测试代码

#include 
#include 

int main()
{
	Py_SetPythonHome(L"C:\ProgramData\Anaconda3\");//指定python.exe位置

	//定义变量
	PyObject* pName = NULL;
	PyObject* pModule = NULL;
	PyObject* pDict = NULL;
	PyObject* pFunc = NULL;
	PyObject* pArgs = NULL;
	PyObject* pRet = NULL;

	//初始化
	Py_Initialize();
	int nret = Py_IsInitialized();
	if (nret == 0)
	{
		std::cout << "python init failn";
		Py_Finalize();
		return -1;
	}


	//设置.py文件所在位置
	PyRun_SimpleString("import sys");
	PyRun_SimpleString("sys.path.append('./')");

	//加载py文件
	pModule = Pyimport_importModule("hello");
	if (pModule == NULL)
	{
		std::cout << "python load hello.py module fail n";
		return -1;
	}

	//导出py方法
	pFunc = PyObject_GetAttrString(pModule, "Sub");

	//传入参数数量
	pArgs = PyTuple_New(2);

	//设置参数  
	PyTuple_SetItem(pArgs, 0, Py_BuildValue("i", 2));
	PyTuple_SetItem(pArgs, 1, Py_BuildValue("i", 4));

	//执行函数
	PyObject *pReturn = Pyeval_CallObject(pFunc, pArgs);

	//获取结果
	int nResult = 0;
	PyArg_Parse(pReturn, "i", &nResult);
	std::cout << "2 + 4 = " << nResult << "n";

	//释放python指针
	Py_Finalize();


	system("pause");
	return 0;
}

结果如下

2 + 4 = -2
请按任意键继续. . .