On Fri, Mar 23, 2001 at 03:58:49PM -0800, Alec Flett wrote:
> John,
> I was just talking with shaver on IRC about this, was wondering if you
> had any ideas about what to do. Basically, I'm trying to move a C++
> implementation of an nsIURIContentListener into JS. The way these are
> used are via the URILoader service:
>
> uriLoader.registerContentListener(foo);
>
> and uriLoader stores a weak reference to "foo" in an nsVoidArray.
> but the problem is that when I go to unregister the javascript version:
>
> uriLoader.unRegisterContentListener(foo)
>
> a different pointer seems to get passed into unRegisterContentListener()
> - so the unregistration never happens, and we're left with a weak
> reference to a disposed-of wrapper object in a void array, which
> subsequently causes a crash.... and just to make sure I wasn't going
> crazy, I did this:
>
> uriLoader.unRegisterContentListener(foo)
> uriLoader.unRegisterContentListener(foo)
>
> and amazingly got two different pointers from c++, neither of which
> matched the original.
>
> any thoughts? I'm holding a strong reference to the object else from
> C++, but I haven't looked to see what the value of THAT pointer is yet...
>
And just to get this question out of the way... Your QI does specifically
list nsISupportsWeakReference, right?
jag
