14.14.1.6 Calling functions with your own custom data types
You can also customize ctypes argument conversion to allow
instances of your own classes be used as function arguments.
ctypes looks for an _as_parameter_ attribute and uses this as
the function argument. Of course, it must be one of integer, string,
or unicode:
>>> class Bottles(object):
... def __init__(self, number):
... self._as_parameter_ = number
...
>>> bottles = Bottles(42)
>>> printf("%d bottles of beer\n", bottles)
42 bottles of beer
19
>>>
If you don't want to store the instance's data in the
_as_parameter_ instance variable, you could define a property
which makes the data avaiblable.
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Release 2.5, documentation updated on 19th September, 2006.