How can I get methods to work as callbacks with python ctypes?

Question

I have an C api that i\'m interfacing with the python ctypes package. Everything works well, except this little tidbit.

To register functions as callbacks to some n

Answer 1

This may be a ctypes bug dealing with the magic behind setting up the stack for methods vs functions.

Have you tried using a wrapper via lambda or function?

Lambda:

func = CALLBACK(lambda x: myPythonCallback(x))

Function:

def wrapper(x): myPythonCallback(x)
func = CALLBACK(wrapper)

There's a third method using closures. If you're setting up the callback from inside the class, the method defined below should inherit the "self" argument due to scope - making it act like a class method despite being a regular function.

class Foo:
    def __init__(self):
        def myPythonCallback(Notification):
            print self # it's there!
            pass # do something with notification

        func = CALLBACK(myPythonCallback)
        myLib.RegisterNofityCallback(45454, 0, func)