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62 lines
2.1 KiB
62 lines
2.1 KiB
# comtypes._meta helper module
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from ctypes import POINTER, c_void_p, cast
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import comtypes
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################################################################
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# metaclass for CoClass (in comtypes/__init__.py)
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def _wrap_coclass(self):
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# We are an IUnknown pointer, represented as a c_void_p instance,
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# but we really want this interface:
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itf = self._com_interfaces_[0]
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punk = cast(self, POINTER(itf))
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result = punk.QueryInterface(itf)
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result.__dict__["__clsid"] = str(self._reg_clsid_)
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return result
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def _coclass_from_param(cls, obj):
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if isinstance(obj, (cls._com_interfaces_[0], cls)):
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return obj
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raise TypeError(obj)
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#
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# The mro() of a POINTER(App) type, where class App is a subclass of CoClass:
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#
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# POINTER(App)
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# App
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# CoClass
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# c_void_p
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# _SimpleCData
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# _CData
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# object
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class _coclass_meta(type):
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# metaclass for CoClass
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#
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# When a CoClass subclass is created, create a POINTER(...) type
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# for that class, with bases <coclass> and c_void_p. Also, the
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# POINTER(...) type gets a __ctypes_from_outparam__ method which
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# will QueryInterface for the default interface: the first one on
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# the coclass' _com_interfaces_ list.
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def __new__(cls, name, bases, namespace):
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klass = type.__new__(cls, name, bases, namespace)
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if bases == (object,):
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return klass
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# XXX We should insist that a _reg_clsid_ is present.
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if "_reg_clsid_" in namespace:
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clsid = namespace["_reg_clsid_"]
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comtypes.com_coclass_registry[str(clsid)] = klass
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PTR = _coclass_pointer_meta("POINTER(%s)" % klass.__name__,
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(klass, c_void_p),
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{"__ctypes_from_outparam__": _wrap_coclass,
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"from_param": classmethod(_coclass_from_param),
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})
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from ctypes import _pointer_type_cache
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_pointer_type_cache[klass] = PTR
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return klass
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# will not work if we change the order of the two base classes!
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class _coclass_pointer_meta(type(c_void_p), _coclass_meta):
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pass
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