hi.. I am trying to write program where I have to call C++ function from the Python. For the calling of C++ function I am using Ctypes. I am using Raspberry Pi having Raspbian OS. Here is my C++ code as test.cpp :
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
#ifdef __cplusplus
extern"C"
#endif
int max(int num1, int num2)
{
// local variable declaration
int result;
if (num1 > num2)
result = num1;
else
result = num2;
return result;
}
And I am compiling this code by the command :
g++ -Wall test.cpp -shared -o test.dll
I have another python code from where I have to call the above C++ function as test.py :
1 2 3 4 5 6 7 8
from ctypes import *
cmax = cdll.LoadLibrary('./test.dll').max
cmax.argtypes = [c_int, c_int] # arguments types
cmax.restype = c_int # return type, or None if void
a = int(raw_input("Enter 1st no : "))
b = int(raw_input("Enter 2nd no : "))
print "Your answer is :", cmax(a,b)
And I am executing the python code as :
sudo python test.py
But I am getting attribute error as :
1 2 3 4 5 6 7 8
Traceback (most recent call last):
File "test.py", line 2, in <module>
cmax = cdll.LoadLibrary('./test.dll').max
File "/usr/lib/python2.7/ctypes/__init__.py", line 378, in __getattr__
func = self.__getitem__(name)
File "/usr/lib/python2.7/ctypes/__init__.py", line 383, in __getitem__
func = self._FuncPtr((name_or_ordinal, self))
AttributeError: ./test.dll: undefined symbol: max
