c++ 调用 python
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
#!/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 '
- 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
Now we know