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POCython callback works correctly for function, but not for bound method
 

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  1. POCython callback works correctly for function, but not for bound method
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    <p>I am implementing a cython-based interface to a C++ library. I implemented a callback system that works with normal functions but fails strangely when passing in bound methods. Here is a portion of my cython code:</p> <pre><code>cdef extern from "VolumeHapticTool.h": cdef cppclass HDButtonEvent: bool isPressed() unsigned int getButtonId() Vec3[float] getPosition() ctypedef void (*HDButtonCallback)(HDButtonEvent, void *) cdef extern from "Scene.h": cdef cppclass Scene: Scene() void setDrillButtonCallback( HDButtonCallback, void*) cdef void pyHDButtonCallback(HDButtonEvent e, void *user_data): print &lt;object&gt;user_data (&lt;object&gt;user_data)( (e.isPressed(), e.getButtonId(), topy_vec3f(e.getPosition())) ) cdef class pyScene: cdef Scene * m_scene def __init__(self): self.m_scene = new Scene() def __del__(self): del self.m_scene def setDrillButtonCallback(self, func): print func self.m_scene.setDrillButtonCallback(pyHDButtonCallback, &lt;void*&gt;func) </code></pre> <p>And here is how I'm trying to call it:</p> <pre><code>class RenderCanvas(GLCanvas): def __init__(self, parent): self.scene = cybraincase.pyScene() self.scene.setDrillButtonCallback(self.OnDrillButtonPress) def OnDrillButtonPress(self, event): print event </code></pre> <p>When this code is run initially, this is printed: <code>&lt;bound method RenderCanvas.OnDrillButtonPress of &lt;UI.RenderCanvas; proxy of &lt;Swig Object of type 'wxGLCanvas *' at 0x42b70a8&gt; &gt;&gt;</code></p> <p>That seems right. The problem is when the callback is triggered, this is printed: <code>&lt;bound method Shell.readline of &lt;wx.py.shell.Shell; proxy of &lt;Swig Object of type 'wxStyledTextCtrl *' at 0x3a12348&gt; &gt;&gt;</code></p> <p>A totally different bound method is being called. However, when I make <code>OnDrillButtonPress</code> a static method, <code>&lt;function OnDrillButtonPress at 0x042FC570&gt;</code> is printed both on initialization and triggering calls.</p> <p>Is there an incompatibility with saving bound methods as void*? </p>
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