XPCOM: Javascript function call alternative 
Mozilla May 31st, 2009
I have wrote a blog post about how to call JavaScript function from C++ XPCOM (XPCOM: Javascript function call), but just found another way to achieve this goal by observer mechanism.
C++ XPCOM code:
1 2 | nsCOMPtr<nsIObserverService> observerService = do_GetService("@mozilla.org/observer-service;1"); observerService->NotifyObservers(NULL, "ping", ToNewUnicode(NS_ConvertASCIItoUTF16("www.google.com"))); |
JavaScript code:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | const Cc = Components.classes; const Ci = Components.interfaces; var aObserver = { observe: function(subject, topic, data) { if (topic == "ping") { alert("Ping: " + data); } } }; var observerService = Cc["@mozilla.org/observer-service;1"].getService(Ci.nsIObserverService); observerService.addObserver(aObserver, "ping", false); |
In multithreading XPCOM, sometime we should call JavaScript function by nsIProxyObjectManager (JavaScript and UI are on a single thread, see nsISupports proxies and nsProxiedService.h for detail)
Related posts:
