c++ 调用 python

  • Makefile first: 

  • g++ t2.cpp -o t2 -I/usr/include/python2.7 -lpython2.7

     

  • t2.cpp code
  • #include <python2.7/Python.h>
    #include <iostream>
    #include <string>

    void printDict(PyObject* obj)
    {
        if(!PyDict_Check(obj))
            return ;

        PyObject *k, *keys;
        keys = PyDict_Keys(obj);

        for(int i=0; i < PyList_GET_SIZE(keys); i++)
        {
            k = PyList_GET_ITEM(keys, i);
            char *c_name = PyString_AsString(k);
            printf("%s\n", c_name);
        }
    }

    int main(void)
    {
        Py_Initialize();
        if(!Py_IsInitialized())
            return -1;
        
        PyRun_SimpleString("import sys");
        //where you put your py file
        PyRun_SimpleString("sys.path.append('../')");
        //Import 
        PyObject* pModule = PyImport_ImportModule("pc");//no *.py
        if(!pModule)
        {
            printf("can't open python file!\n");
            return -1;
        }
        //Dict module
        PyObject* pDict = PyModule_GetDict(pModule);
        if(!pDict)
        {
            printf("can't find dictionary.\n");
            return -1;
        }
        printDict(pDict);

        PyObject *pFunHi = PyDict_GetItemString(pDict, "sayHi");
        PyObject_CallFunction(pFunHi, "s""yourname");// @para1: obj, @para2: name
        
    //release
        Py_DECREF(pFunHi);
        
        //Contruct a obj , call it's function
        
    //Second Class
        PyObject *pClassSecond = PyDict_GetItemString(pDict , "Second");
        if(!pClassSecond)
        {
            printf("can't find second class.\n");
            return -1;
        }
        //Person Class
        PyObject *pClassPerson = PyDict_GetItemString(pDict, "Person");
        if(!pClassPerson)
        {
            printf("can't find Person class.\n");
            return -1;
        }
        //Construct Second Instance
        PyObject* pInstanceSecond = PyInstance_New(pClassSecond, NULL, NULL);
        if(!pInstanceSecond)
        {
            printf("can't create second instance.\n");
            return -1;
        }
        //Construct Person Instance
        PyObject *pInstancePerson = PyInstance_New(pClassPerson, NULL, NULL);
        if(!pInstancePerson)
        {
            printf("can't create Person instance.\n");
            return -1;
        }

        //pass Person Instance to Second Instance 
        PyObject_CallMethod(pInstanceSecond, "invoke""O", pInstancePerson);
        PyObject_CallMethod(pInstanceSecond, "method2""O", pInstancePerson);

        //call execute a py file
        PyRun_SimpleString("exec(compile(open('./1.py').read(),'1.py', 'exec'),locals(), globals())");
        //release
        Py_DECREF(pInstanceSecond);
        Py_DECREF(pInstancePerson);
        Py_DECREF(pClassSecond);
        Py_DECREF(pClassPerson);
        Py_DECREF(pModule);
        Py_Finalize();

        return 0;
    }

  • pc.py ( I put it at ..(upper) dir )
  • #!/usr/bin/python

    class Person:
        def sayHi(self):
            print 'Hi'

    class Second:
        def invoke(self, obj):
            obj.sayHi()
        def method2(self, obj):
            print "this is method2"

    def sayHi(name):
        print 'Hi ,', name

  • 1.py ( I put it at .(this) dir )
  •  #!/usr/bin/python

    print " hello exec python"
  • output:

  • sayHi
    __builtins__
    __file__
    __package__
    Person
    Second
    __name__
    __doc__
    Hi , yourname
    Hi
    this is method2
     hello exec python

    from http://hi.baidu.com/zhouhanqing/blog/item/75b6134f2bddd91cb2de051a.html edited some of code

  • some extra info , try look at the following code test in python :

    {'__builtins__': <module '>>> locals()
    __builtin__
    ' (built-in)>, '__name__''__main__''__doc__': None, '__package__': None}
    >>> globals()
    {'__builtins__': <module '__builtin__' (built-in)>, '__name__''__main__''__doc__': None, '__package__': None}
    >>> execfile("/home/dengwei/python_test/cpp/1.py")
     hello exec python
    >>> execfile("~/python_test/cpp/1.py")
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    IOError: [Errno 2] No such file or directory: '~/python_test/cpp/1.py'
  • Now we know

    • 1.locals()
    • 2.globals()
    • 3.how to exec a python file (in python)
    • 4.we knows exec a python file should specify it's absolute path

     

原文链接: https://www.cnblogs.com/no7dw/archive/2012/08/22/2651543.html

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    c++ 调用 python

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