Hello, 2009/7/8 Erik Groeneveld <e...@cq2.nl>: > I am working on an extension that allows one to open Java .jar files > and use the objects defined in it (via CNI or JNI) in Python. It > works like a charm, but I am stuck with the definition of a metatype > for the wrappers. I have to do this in Python now, with a helper > class. > > I did find examples of how to define metatypes, but I can't find > anything on how to declare one type using this metatype. > > Could anyone point me to examples or documentation or help me fix my code > below? [...]
There are several changes to do in your code: - Don't define a JObjectMeta struct, use JObjectType directly instead. An instance of the metatype is the type itself! - Don't set JObjectMetaType.tp_basicsize, let it inherit from the base type (the correct value would be sizeof(PyHeapTypeObject), this is important in order to create derived classes in python) - Don't set JObjectMetaType.tp_new, let it inherit from the base type (PyType_GenericNew just allocates memory; types are more complex...) - JObjectType.tp_base = &JObjectMetaType" is wrong, it should be "JObjectType.ob_type = &JObjectMetaType;", or better to be compatible with python3: "Py_TYPE(JObjectType) = &JObjectMetaType;" In summary, I made your example work with: JObjectMetaType.tp_name = "metaclass.JObjectMeta"; JObjectMetaType.tp_flags = Py_TPFLAGS_DEFAULT; JObjectMetaType.tp_doc = "JObjectMeta objects"; JObjectMetaType.tp_init = JObjectMeta_init; JObjectMetaType.tp_base = &PyType_Type; JObjectMetaType.tp_getattro = JObjectMeta_getattro; Py_TYPE(&JObjectType) = &JObjectMetaType; JObjectType.tp_name = "metaclass.JObject"; JObjectType.tp_basicsize = sizeof(JObject); JObjectType.tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE; JObjectType.tp_doc = "JObject objects"; JObjectType.tp_init = JObject_init; -- Amaury Forgeot d'Arc _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
