ok, I have finally managed. Heres the code:
//class decl
class LocationListener: public nsIWebProgressListener, public
nsSupportsWeakReference
{
public:
LocationListener();
virtual ~LocationListenerW();
NS_DECL_ISUPPORTS
NS_DECL_NSIWEBPROGRESSLISTENER
};
//class impl
NS_IMPL_ISUPPORTS2(LocationListener, nsIWebProgressListener,
nsISupportsWeakReference)
NS_IMETHODIMP LocationListener::OnXXChange(...)
{
return NS_OK;
}
//and class usage. plistener must be created non-locally
LocationListener * listener = new LocationListener();
nsCOMPtr<nsISupports> plistener = static_cast<nsIWebProgressListener
*>(listener);
nsCOMPtr<nsIWeakReference> weakref = do_GetWeakReference(plistener, &retval);
retval = browser->AddWebBrowserListener(weakref,
NS_GET_IID(nsIWebProgressListener));
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