So what am I missing? The component factory does seem to support nsIClassInfo, but it just doesn't implement the GetInterfaces hook?
That's correct. As I said, nsGenericFactory implements nsIClassInfo (in the sense of "can be QId to it"), but to have a useful GetInterface implementation, the component must support classinfo.
I was under the impression that the class
info, if at all implemented, would be provided by the components factory.
hm, well, I was surprised to see that :). But classinfo support in the factory requires consideration from the component author. (and it costs codesize of course).
Should I be creating an instance of the component and query that for the nsIClassInfo interface instead?
Will give exactly the same result :)
Is it considered okay to create instances of
random components?
I'd say so. Although, if you do this in a current mozilla, you'll createinstance stuff which already exists as a service, and that may be bad... so it's probably better to use the classobject.
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