我尝试将Python脚本嵌入到我的C
程序中。在阅读了有关嵌入和扩展的一些知识之后，我了解了如何打开自己的python脚本以及如何向其传递一些整数。但是现在我有点不了解如何解决我的问题。我必须做这两个事情，从C
调用Python函数，并从我的嵌入式Python脚本调用C 函数。但是我不知道该从哪里开始。我知道我必须编译一个.so文件以将我的C
函数暴露给Python，但是我无能为力，因为我必须嵌入我的Python文件并使用C ++代码进行控制（我必须使用脚本语言，使某些逻辑易于编辑）。

那么，有什么办法可以做这两件事吗？从C 调用Python函数并从Python调用C 函数？

这是我的C ++代码

#include <Python.h>
#include <boost/python.hpp>
using namespace boost::python;


// <----------I want to use this struct in my python file---------
struct World
{
    void set(std::string msg) { this->msg = msg; }
    std::string greet() { return msg; }
    std::string msg;
};


// Exposing the function like its explained in the boost.python manual
// but this needs to be compiled to a .so to be read from the multiply.py
BOOST_PYTHON_MODULE(hello)
{
    class_<World>("World")
        .def("greet", &World::greet)
        .def("set", &World::set)
    ;
}
// <---------------------------------------------------------------


int
main(int argc, char *argv[]) // in the main function is only code for embedding the python file, its not relevant to this question
{
    setenv("PYTHONPATH",".",1);
    PyObject *pName, *pModule, *pDict, *pFunc;
    PyObject *pArgs, *pValue;
    int i;

    if (argc < 3) {
        fprintf(stderr,"Usage: call pythonfile funcname [args]\n");
        return 1;
    }

    Py_Initialize();
    pName = PyString_FromString(argv[1]);
    /* Error checking of pName left out */

    pModule = PyImport_Import(pName);
    Py_DECREF(pName);

    if (pModule != NULL) {
        pFunc = PyObject_GetAttrString(pModule, argv[2]);
        /* pFunc is a new reference */

        if (pFunc && PyCallable_Check(pFunc)) {
            pArgs = PyTuple_New(argc - 3);
            for (i = 0; i < argc - 3; ++i) {
                pValue = PyInt_FromLong(atoi(argv[i + 3]));
                if (!pValue) {
                    Py_DECREF(pArgs);
                    Py_DECREF(pModule);
                    fprintf(stderr, "Cannot convert argument\n");
                    return 1;
                }
                /* pValue reference stolen here: */
                PyTuple_SetItem(pArgs, i, pValue);
            }
            pValue = PyObject_CallObject(pFunc, pArgs);
            Py_DECREF(pArgs);
            if (pValue != NULL) {
                printf("Result of call: %ld\n", PyInt_AsLong(pValue));
                Py_DECREF(pValue);
            }
            else {
                Py_DECREF(pFunc);
                Py_DECREF(pModule);
                PyErr_Print();
                fprintf(stderr,"Call failed\n");
                return 1;
            }
        }
        else {
            if (PyErr_Occurred())
                PyErr_Print();
            fprintf(stderr, "Cannot find function \"%s\"\n", argv[2]);
        }
        Py_XDECREF(pFunc);
        Py_DECREF(pModule);
    }
    else {
        PyErr_Print();
        fprintf(stderr, "Failed to load \"%s\"\n", argv[1]);
        return 1;
    }
    Py_Finalize();
    return 0;
}

这是我的Python文件

import hello_ext #importing the C++ file works only if its compiled as a .so
planet = hello.World() #this class should be exposed to python
planet.set('foo')

def multiply(a,b):
    planet.greet()
    print "Will compute", a, "times", b
    c = 0
    for i in range(0, a):
        c = c + b
    return c