Yeah, I have read that at least a dozen times today ;)

self.browser.addWebBrowserListener(WeakReference(chrome, interfaces.nsIWebProgressListener),
                                   interfaces.nsIWebProgressListener)

doesn't work: 

File "<XPCOMObject method 'addWebBrowserListener'> ", line 3, in addWebBrowserListener
TypeError: Objects of type 'instance' can not be used as COM objects

On Thu, 2007-06-21 at 11:29 -0700, Shane Caraveo wrote: 
>  From the doc string for WeakReference:
>  
>  class WeakReference:
>       """A weak-reference object.  You construct a weak reference by passing
>       any COM object you like.  If the object does not support weak
>       refs, you will get a standard NS_NOINTERFACE exception.
>  
>       Once you have a weak-reference, you can "call" the object to get
>       back a strong reference.  Eg:
>  
>       >>> some_ob = components.classes['...']
>       >>> weak_ref = WeakReference(some_ob)
>       >>> new_ob = weak_ref() # new_ob is effectively "some_ob" at this point
>       >>> # EXCEPT: new_ob may be None if some_ob has already died - a
>       >>> # weak reference does not keep the object alive (that is the point)
>  
>       You should never hold onto this resulting strong object for a long 
>  time,
>       or else you defeat the purpose of the weak-reference.
>       """
>  
>  
>  Tomeu Vizoso wrote:
>  > Hi all,
>  > 
>  > I need to pass a reference to a nsIWeakReference to
>  > nsIWebBrowser.addWebBrowserListener(nsIWeakReference listener, nsIIDRef
>  > IID).
>  > 
>  > The only way I've found to do it is this:
>  > 
>  > listener = xpcom.server.WrapObject(chrome, interfaces.nsIWebProgressListener)
>  > weak_ref2 = xpcom.client.WeakReference(listener)
>  > self.browser.addWebBrowserListener(weak_ref2._comobj_,
>  >                                    interfaces.nsIWebProgressListener)
>  > 
>  > I guess weak_ref2._comobj_ is not the best way to get a nsIWeakReference.
>  > 
>  > Any suggestion?
>  > 
>  > Thanks,
>  > 
>  > Tomeu
>  > 
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