- Instantiating an XPCOM component from JavaScript is as easy as...
/* get the factory */
var prefFactory =
Components.classes["component://netscape/preferences"];
/* create a default instance (nsISupports) */
var prefInstance =
prefFactory.createInstance();
/* query the instance for the correct interface */
var pref =
prefInstance.QueryInterface(Components.interfaces.nsIPref);
- Or, to put it more simply...
const nsIPref = Components.interfaces.nsIPref;
const PREF_PROGID = "component://netscape/preferences";
var pref = Components.classes[PREF_PROGID].createInstance(nsIPref);
- Both of the previous examples omitted error checks, it is generally
a good idea to wrap component creation in a try / catch
block.
|
