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Python/Cython/C and callbacks, calling a Python function from C using Cython

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日久生厌 2020-12-30 15:49

I have the following question. We have to pass callback functions to the C code. If the function is a Cython function in the same module, the situation is quite simple

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  • 情话喂你
    情话喂你 (楼主)
    2020-12-30 16:08

    In this example, extracted from a Python wrapper to the Cubature integration C library, a Python function is passed to a C function that has the prototype given by cfunction. You can create a function with the same prototype, called cfunction_cb (callback), and returning the same type, int in this example):

    cdef object f
ctypedef int (*cfunction) (double a, double b, double c, void *args)

cdef int cfunction_cb(double a, double b, double c, void *args):
    global f
    result_from_function = (f)(a, b, c, *args)
    for k in range(fdim):
        fval[k] = fval_buffer[k]
    return 0



    When calling the C function, you can cast your callback wrapper using the C prototype:
    


    def main(pythonf, double a, double b, double c, args): 
    global f
    f = pythonf
    c_function(  cfunction_cb,
                double a,
                double b,
                double c,
                 args )

    


    In this example it is also shown how to pass arguments to your Python function, through C.
    
    
    
             
    
                                                        
    
            
            
    
              
                
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