On Feb 26, 1:12 am, Steven D'Aprano <st...@remove-this- cybersource.com.au> wrote: > On Thu, 25 Feb 2010 21:07:55 -0800, darnzen wrote: > > Having an odd problem that I solved, but wondering if its the best > > solution (seems like a bit of a hack). > > > First off, I'm using an external DLL that requires static callbacks, but > > because of this, I'm losing instance info. > [...] > > How can I get at the app instance (currently I'm storing that along with > > the class instance in the constructor)? Is there another way to do this > > that's not such a hack? > > Pass the instance explicitly: > > >>> class K(object): > > ... @staticmethod > ... def static(self, x, y): > ... print self, x, y > ...>>> k = K() > >>> k.static(k, 1, 2) > > <__main__.K object at 0xb7c2544c> 1 2 > > -- > Steven
Unfortunately, since the callback is from the DLL which I didn't write, I can not change what is passed to the function. Also, the DLL has no idea about my local namespace. The DLL typically will pass back two integers (which I can set the values of when I register the callback), and some data. Currently Im' using these integers as keys in a local dict where I'm storing the instances. I suppose I could use the integers to store the high and low order bytes of a pointer to the instance, but not sure how to do that in Python (would be easy in c/c++). Also, I'm not sure how python memory management works, if it will move objects around and make things buggy. Also, that is definitely a hack and isn't very 'pythonesque' -- http://mail.python.org/mailman/listinfo/python-list
