C++如何调用PYTHON？

lonerwolf

RT

1. #include <Python.h>
   
2. #include <iostream>
   
3. #include <string>
   
4. void printDict(PyObject* obj)
   
5. {
   
6.     if( !PyDict_Check(obj))
   
7.         return;
   
8.     PyObject *k,*keys;
   
9.     keys = PyDict_Keys(obj);
   
10.     for(int i = 0; i < PyList_GET_SIZE(keys); i++)
    
11.     {
    
12.         k = PyList_GET_ITEM(keys, i);
    
13.         char* c_name = PyString_AsString(k);
    
14.         printf("%s/n",c_name);
    
15.     }
    
16. }
    
17. int main()
    
18. {
    
19.     Py_Initialize();
    
20.     if(!Py_IsInitialized())
    
21.        return -1;
    
22.     PyRun_SimpleString("import sys");
    
23.     PyRun_SimpleString("sys.path.append('./')");
    
24.     //导入模块
    
25.     PyObject* pModule=PyImport_ImportModule("second");
    
26.     if(!pModule)
    
27.     {
    
28.           printf("Cant open python file!/n");
    
29.         return -1;
    
30.     }
    
31.     //模块的字典列表
    
32.     PyObject* pDict = PyModule_GetDict(pModule);
    
33.     if(!pDict)
    
34.     {
    
35.         printf("Cant find dictionary./n");
    
36.         return -1;
    
37.     }
    
38.     //打印出来看一下
    
39.     printDict(pDict);
    
40.     //获取Second类
    
41.     PyObject* pClassSecond = PyDict_GetItemString(pDict,"Second");
    
42.     if( !pClassSecond )
    
43.     {
    
44.         printf("Cant find second class./n");
    
45.         return -1;
    
46.     }
    
47.     //构造Second的实例
    
48.     PyObject* pInstanceSecond = PyInstance_New(pClassSecond,NULL,NULL);
    
49.     if( !pInstanceSecond)
    
50.     {
    
51.         printf("Cant create second instance./n");
    
52.         return -1;
    
53.     }
    
54.     //获取Person类
    
55.     PyObject* pClassPerson = PyDict_GetItemString(pDict,"Person");
    
56.     if( !pClassPerson )
    
57.     {
    
58.         printf("Cant find person class./n");
    
59.         return -1;
    
60.     }
    
61.     //构造Person的实例
    
62.     PyObject* pInstancePerson = PyInstance_New(pClassPerson,NULL,NULL);
    
63.     if( !pInstancePerson )
    
64.     {
    
65.         printf("Cant find person instance./n");
    
66.         return -1;
    
67.     }
    
68.     PyObject_CallMethod(pInstanceSecond,"invoke","O",pInstancePerson);
    
69.     Py_DECREF(pModule); //都需要释放,例子就不写了
    
70.     Py_Finalize();
    
71.     getchar();
    
72.     return 0;
    
73. }

复制代码

1. #!/usr/bin/python
   
2. # Filename: second.py
   
3. class Person:
   
4.     def sayHi(self):
   
5.         print 'hi'
   
6. class Second:
   
7.     def sayHello(self):
   
8.         print 'hello'
   
9.     def invoke(self,obj):
   
10.         obj.sayHi()

复制代码

网上的例子，PyDict_GetItemString一直返回为空，调用不到

littledick

这种异步调用写成同步执行的例子么{:3_182:}