I have the following:

• A library of C function which is compiled into a dll
• A cython module with a function that expects as a parameter a C callback function.

My problem is how to make a python script to pass directly the address of a C function from the dll to the cython function.

example:

-- C code ---

float mul(float a, float b)

{

  return a*b;

}

-- cython module --

ctypedef float c2f(float, float)

def call_c(c2f fun, float x, float y):
    return fun(x, y)

----------------------

I can use ctypes as the follows, but the call goes through a python wrapper

from ctypes import *

import cython_module

dll = cdll.LoadLibrary('./C_modile.so')

mul = dll.mul

mul.argtypes = [c_float, c_float]
mul.restype = c_float

cython_module.call_c(mul, c_float(3), c_float(2))

I found a work around by adding the following line to the C code:

void* mulp = mul

So the following line in the python module provides the address of the mul function:

mull_addr = c_void_p.in_dll(dll, "mul")

I am wondering if there is a friendly and simple(r)  solution.

   Nadav.