hi
I am trying to create a component as exactly the same steps as disscus
in Mozillazine
Forum<http://forums.mozillazine.org/viewtopic.php?t=308369&postdays=0&postorder=asc&postsperpage=15&start=0>
the whole code is:
*********************************************************************************************************
function MyComponent() {
// you can do |this.wrappedJSObject = this;| for the first version of the
component
// (in case you don't want to write IDL yet.)
}
MyComponent.prototype = {
classID: Components.ID("{xxxxxxxx-be3a-2b41-7a76-12533ba32166}"), // xxx
generate guid
contractID: "@mozilla.doslash.org/test/component;1", // XXX generated
contractid too
classDescription: "Test component",
QueryInterface: function(aIID) {
if(!aIID.equals(CI.nsISupports) && !aIID.equals(CI.nsIObserver) &&
!aIID.equals(CI.nsISupportsWeakReference)) // you can claim you implement
more interfaces here
throw CR.NS_ERROR_NO_INTERFACE;
return this;
},
// you can implement other interfaces here..
*MyVar: 'Hello' , // I need a Global Variable too*
// nsIObserver implementation
observe: function(aSubject, aTopic, aData) {
switch(aTopic) {
case "xpcom-startup":
dump("xpcom-startup");
// this is run very early, right after XPCOM is initialized, but
before
// user profile information is applied. Register ourselves as an
observer
// for 'profile-after-change' and 'quit-application'.
var obsSvc = CC["@mozilla.org/observer-service;1"].getService(
CI.nsIObserverService);
obsSvc.addObserver(this, "profile-after-change", true);
obsSvc.addObserver(this, "quit-application", true);
break;
case "profile-after-change":
// This happens after profile has been loaded and user preferences
have been read.
// startup code here
break;
case "quit-application":
dump("quit");
// shutdown code here
break;
default:
throw Components.Exception("Unknown topic: " + aTopic);
}
}
};
// constructors for objects we want to XPCOMify
var objects = [MyComponent];
/*
* Registration code.
*
*/
const CI = Components.interfaces, CC = Components.classes, CR =
Components.results;
const MY_OBSERVER_NAME = "My Observer";
function FactoryHolder(aObj) {
this.CID = aObj.prototype.classID;
this.contractID = aObj.prototype.contractID;
this.className = aObj.prototype.classDescription;
this.factory = {
createInstance: function(aOuter, aIID) {
if(aOuter)
throw CR.NS_ERROR_NO_AGGREGATION;
return (new this.constructor).QueryInterface(aIID);
}
};
this.factory.constructor = aObj;
}
var gModule = {
registerSelf: function (aComponentManager, aFileSpec, aLocation, aType)
{
aComponentManager.QueryInterface(CI.nsIComponentRegistrar);
for (var key in this._objects) {
var obj = this._objects[key];
aComponentManager.registerFactoryLocation(obj.CID, obj.className,
obj.contractID, aFileSpec, aLocation, aType);
}
// this can be deleted if you don't need to init on startup
var catman = CC["@mozilla.org/categorymanager;1"].getService(
CI.nsICategoryManager);
catman.addCategoryEntry("xpcom-startup", MY_OBSERVER_NAME,
MyComponent.prototype.contractID, true, true);
catman.addCategoryEntry("xpcom-shutdown", MY_OBSERVER_NAME,
MyComponent.prototype.contractID, true, true);
},
unregisterSelf: function(aCompMgr, aFileSpec, aLocation) {
// this must be deleted if you delete the above code dealing with
|catman|
var catman = CC["@mozilla.org/categorymanager;1"].getService(
CI.nsICategoryManager);
catman.deleteCategoryEntry("xpcom-startup", MY_OBSERVER_NAME, true);
// end of deleteable code
aComponentManager.QueryInterface(CI.nsIComponentRegistrar);
for (var key in this._objects) {
var obj = this._objects[key];
aComponentManager.unregisterFactoryLocation(obj.CID, aFileSpec);
}
},
getClassObject: function(aComponentManager, aCID, aIID) {
if (!aIID.equals(CI.nsIFactory)) throw CR.NS_ERROR_NOT_IMPLEMENTED;
for (var key in this._objects) {
if (aCID.equals(this._objects[key].CID))
return this._objects[key].factory;
}
throw CR.NS_ERROR_NO_INTERFACE;
},
canUnload: function(aComponentManager) {
return true;
},
_objects: {} //FactoryHolder
};
function NSGetModule(compMgr, fileSpec)
{
for(var i in objects)
gModule._objects[i] = new FactoryHolder(objects[i]);
return gModule;
}
*********************************************************************************************************
this component works perfectly as a observer but i have a problem to access
my Global variable
as discuss in
developer.mozilla<http://developer.mozilla.org/en/docs/Working_with_windows_in_chrome_code#Advanced_data_sharing>about
Advanced data sharing, i use this code to read/Write my Global
variable
var myService =
Components.classes["@mozilla.doslash.org/test/component;1"].getService();
myService.wrappedJS.MyVar = "Some Strings";
but this error occurs : myService.wrappedJS has no properties
any body can help
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