Thanks for your suggestions. I did use the do_GetService(getService) before
using CreateInstance(createInstance).
It was not working. Now, I use do_GetService(getService) and test again. I
found that it wouldn't work until I reloaded
the page again. That's a bit of weird. I don't see why it doesn't work on
first load. Upon reloading the page and then
pressing the button associated with the javascript method again, it popped
up a window to say "a script from "file://" has
requested enhanced privilege..." message to ask me if allowing the
privilege. The message is actually defined in
the /caps/src/security.properties. It's a bit of annoying. I like to turn on
the privilege option in some config file like pref.js
so that the message window won't popup while it still grants the privilege.
So, which setting in which config file grants the privilege?
Or, some other setting like "UniversalXPConnect" could do so from
javascript?
Thanks
"Mike Shaver" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Chris Shen wrote:
>
> > Components.classes["@mozilla.org/notifservice;1"].createInstance();
>
>
> > notifserv = do_CreateInstance(NS_NOTIFSERVICE_CONTRACTID, &rv);
>
>
> > I expect:
> > At the runtime, my browser application loads the notifservice first and
> > add itself as a listener to the service. By the time, I assume the
> > notifservice
> > remaining in memory. Then my browser app loads the test html page which
> > loads
> > the notifservice as well. Because the notifservice already registered in
> > memory,
> > I assume the xpconnect only increases the reference count rather than
> > creates
> > a new instance again.
>
>
> do_CreateInstance (C++) and createInstance (JS) will always create a new
> instance. To access (possibly instantiating, if none exists) a shared
> service, use do_GetService (C++) and getService (JS) instead.
>
> > The breakpoint never reaches nsNotifService's notif method. It seems
tell me
> > that
> > loading the notifservice in js isn't successfully.
>
>
> What's the error it gives? Did you put the typelib for the
> nsINotifService in the components directory?
>
> (We have nsIObserver for this sort of mechanism already, which you might
> find requires you to write less new code -- you'd just need an
> implementation of nsIObserver in C++, really, and there are lots to
follow.)
>
> Mike
>
