转自:http://chensx.iteye.com/blog/1299383
某些时候,用python模块来实现一些特定的功能会比用其他类型的模块更加简洁方便。
在C++程序中,调用python模块时需要加载一些必要的libs,这些libs在网上都可以找到。下面的代码演示了C++程序如何调用python中的函数,并得到从python函数中返回的多个值。
- # filename : cal.py
- # return type : tuple
- def mix(a, b) :
- r1 = a + b
- r2 = a - b
- return (r1, r2) # (7,3)
- #include "stdafx.h"
- #include ".\\include\\Python.h"
- int _tmain(int argc, _TCHAR* argv[])
- {
- string filename = "cal"; // cal.py
- string methodname_mix = "mix"; // function name
- Py_Initialize();
- // load the module
- PyObject * pyFileName = PyString_FromString(filename.c_str());
- PyObject * pyMod = PyImport_Import(pyFileName);
- // load the function
- PyObject * pyFunc_mix = PyObject_GetAttrString(pyMod, methodname_mix.c_str());
- // test the function is callable
- if (pyFunc_mix && PyCallable_Check(pyFunc_mix))
- {
- PyObject * pyParams = PyTuple_New(2);
- PyTuple_SetItem(pyParams, 0, Py_BuildValue("i", 5));
- PyTuple_SetItem(pyParams, 1, Py_BuildValue("i", 2));
- // ok, call the function
- int r1 = 0, r2 = 0;
- PyObject * pyValue = PyObject_CallObject(pyFunc_mix, pyParams);
- PyArg_ParseTuple(pyValue, "i|i", &r1, &r2);
- if (pyValue)
- {
- printf("%d,%d\n", r1, r2); //output is 7,3
- }
- }
- Py_Finalize();
- return 0;
- }