Cython can't convert to int?

using Anaconda, Python 3.4 and Win7 64bit, I cannot run this:

C Code:

    int addInts(int a, int b)
{
    return a+b;
}

      

        
        
        
      

    

PYX file:

cdef extern from "square.cpp":
    int addInts(int, int)

def pAddInts(int a, int b):
    return addInts(a, b)

      

        
        
        
      

    

and a test file:

res = callCpp.pAddInts(3, 4)

      

        
        
        
      

    

error message:

Traceback (most recent call last):
  File "testScript.py", line 9, in <module>
    res = callCpp.pAddInts(a, b)
  File "callCpp.pyx", line 16, in callCpp.pAddInts (callCpp.cpp:952)
    def pAddInts(int a, int b):
TypeError: __int__ returned non-int (type int)

      

        
        
        
      

    

No @all problem with double and double *, but ints doesn't work. What is the problem? Thank!