I am currently working with Gecko SDK/XULRunner 10.* and I am trying to
observe application on shutdown thanks to nsIObserverService. Well,
according to [1], it is possible to observe the topic
“quit-application*” but none of them seems to work with me (and it is a
little bit frustrating ;-)). Here is the code I use:

    var applicationQuitObserver = {

    get observerService ( ) {

    return Cc['...@mozilla.org/observer-service;1'].getService(
    Ci.nsIObserverService
    );
    },

    observe: function ( subject, topic, data ) {

    dump('Here?');
    // Just as an example.
    },

    register: function ( ) {

    dump('Register');
    this.observerService.addObserver(this, 'quit-application-granted',
    false);
    },

    unregister: function ( ) {

    this.observerService.removeObserver(this,
    'quit-application-granted', false);
    }
    };
    applicationQuitObserver.register();

And when I close the window with the “close button” or with the
nsIAppStartup [2], the dump “Here?” does not appear in console whereas
the dump “Register” appears as expected. If you want to try, you can
start with the sample-app [3] proposed by Mark Finkle with the simple
following prefs.js:

    pref("toolkit.defaultChromeURI", "chrome://myapp/content/main.xul");
    pref("browser.dom.window.dump.enabled", true);
    pref("javascript.options.showInConsole", true);
    pref("javascript.options.strict", true);
    pref("nglayout.debug.disable_xul_cache", true);
    pref("nglayout.debug.disable_xul_fastload", true);

Immediatly, I thought the I/O was closed to early for me. So I have
tried to open a new file and writing in it. It works when I was
observing the topic “xul-window-visible” (for a test) but still not with
“quit-application*”.

So. Any thoughts?
Cheers.

[1] <https://developer.mozilla.org/en/Observer_Notifications>
[2]
<https://developer.mozilla.org/en/XPCOM_Interface_Reference/nsIAppStartup>
[3] <https://developer.mozilla.org/en/Getting_started_with_XULRunner>

--
Ivan Enderlin
Developer of Hoa
http://hoa.42/ or http://hoa-project.net/

PhD. student at DISC/Femto-ST (Vesontio) and INRIA (Cassis)
http://lifc.univ-fcomte.fr/ and http://www.inria.fr/

The quit-application-requested notification is fired in the following cases:

* when the user is logging out of Windows
* when the user chooses "quit" from the mac application menu
* when the addons service or update services wishes to restart the
application
* when gnome on Linux tells Firefox that the desktop is logging out
* when something in the XUL code calls "goQuitApplication" on
globalOverlay.js (which is used by the "Quit Firefox" menu item
* when something calls "closeWindow" on globalOverlay.js (which is used
by the Firefox frontend)

But as you'll note, if you have just written your own XUL app and close
a window, the application will quit without any of those conditions
being triggered, so no quit-application-requested will ever be fired.
Quit-application-granted is fired by the app runner, so it should be
fired in almost all shutdown cases:
http://mxr.mozilla.org/mozilla-central/source/toolkit/components/star...

In any case, I'm not sure who maintains that Devmo page, and it looks
pretty woeful: I would recommend using
https://wiki.mozilla.org/XPCOM_Shutdown instead.

On 12/03/12 19:28, Benjamin Smedberg wrote:

Thank you :-).
Best regards.

--
Ivan Enderlin
Developer of Hoa
http://hoa.42/ or http://hoa-project.net/

PhD. student at DISC/Femto-ST (Vesontio) and INRIA (Cassis)
http://lifc.univ-fcomte.fr/ and http://www.inria.fr/