c++ 调用 python
[*]Makefile first:g++ t2.cpp -o t2 -I/usr/include/python2.7 -lpython2.7
[*]t2.cpp code
#include
#include
#include
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__': , '__name__': '__main__', '__doc__': None, '__package__': None}
>>> globals()
{'__builtins__': , '__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 "", line 1, in
IOError: 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
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