Problems Calling Python From C++

test.py def add(a,b): ''' ''' print a,b,a+b return a+b c program #include int _tmain(int argc, _TCHAR* argv[]) { try { PyObject *pName,*pModule,*pDict,*pF

Solution 1:

Last I checked, C doesn't have exceptions. Surely, you're not going to get any exceptions thrown by calls to the Python lib.

First, since you're using C++, you may need to include the Python lib with an extern declaration.

extern "C" {
    #include "python.h"
}

Next, since you don't have exceptions in C calls, you should test the result of each call as you go along. This will help you better understand where it's failing.

Since you're not getting a segfault or anything, I suspect you're getting to

if(!Py_IsInitialized())
 return -1;

And exiting. Instead, you could print the return value so you know what's happening.

int is_init = Py_IsInitialized();
cout << "are we initialized? " << is_init;
if(!is_init)
    return -1;

If that doesn't demonstrate the trouble, then add additional cout statements throughout your code to trace where the problem is occurring... or better yet, use a debugger and step through the code as it runs. Surely you'll find what's going wrong.

Solution 2:

I found it contains some chinese words in first line.

#XXX

And, it also didn't work in pythonwin. Said something wrong.

So, I deleted them, and it's OK!