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copied!<p>As you probably figured out, the problem in the call</p> <pre><code>bot.event_set(VP.EVENT_OBJECT_CLICK, click) </code></pre> <p>Indeed, the third argument <code>click</code> is a <strong>Python</strong> function object which you are passing in <code>event_set</code> to <code>vp_event_set</code>. Alas <code>vp_event_set</code> is expecting a <code>VPEventHandler</code> that is a <strong>C</strong> function pointer of type <code>void(*VPEventHandler)(VPInstance);</code></p> <p>I think I would build a dictionary associating to a <code>VPInstance</code> (<code>void *</code> pointer casted as integer) an instance of some <code>PyEvent</code> class which should contains itself the function click. Using that you can ensure that you need on one C function as callback. </p> <p>In <code>foo.pxd</code>:</p> <pre><code>cdef class PyEvent(object): cdef VPInstance instance cdef object py_callback </code></pre> <p>In <code>foo.pyx</code>: events = dict()</p> <pre><code>cdef void EventCallBack(VPInstance instance): PyEvent ev = <PyEvent> dict[events[<size_t> self.instance] ev.py_callback(ev) cdef class PyEvent(object): def __init__(self, click): self.instance = vp_create() self.py_callback = click def event_set(self, eventname): global events events[<size_t> self.instance] = self return vp_event_set(self.instance, eventname, EventCallBack) </code></pre> <p>I don't have a chance to test this, so I hope it more or less works. Also I would recommend asking on cython-users@googlegroups.com as they are usually really helpful and more expert than me.</p>

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