I'm short on ideas. Perhaps if you make a more complete version of
your code available then someone will see something. For instance, I
don't see the QueryInterface implementation of your C++ object. If
that method fails to handle the nsICancelable case then XPConnect will
fail to build a wrapper around it when it is passed to the JS code -
and the call would fail. There are other such possibilities :)
You could also just try adding a method with no params to the callback
interface, implement it in JS, and try calling that. i.e. get
*something* working and then figure out what is different about what
doesn't work.
John.
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