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

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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