(Ffos Gecko)-Several ways of registering a XPCOM Component

1. JavaScript Component

(1) Add a customcomponent.manifest

inch customcomponent.jscomponent {e6b866e3-41b2-4f05-a4d2-3d4bde0f7ef8} components/ Customcomponent.jscontract @foobar/customcomponent;1 {e6b866e3-41b2-4f05-a4d2-3d4bde0f7ef8}category Profile-after-change customcomponent @foobar/customcomponent;1

(2) Export a nsgetfactory () function

Components.utils.import ("RESOURCE://GRE/MODULES/XPCOMUTILS.JSM");functioncustomcomponent () {}customcomponent.prototype= {  //This must match whatever are in chrome.manifest!ClassID:Components.ID ("{E6b866e3-41b2-4f05-a4d2-3d4bde0f7ef8}"), QueryInterface:XPCOMUtils.generateQI ([Components.interfaces.nsICustomComponent]),/*nsicustomcomponent implementation goes here*/  ...};//The following line is a XPCOM uses to create components. Each component prototype//must has a. ClassID which is used to create it.if(xpcomutils.generatensgetfactory) {const nsgetfactory=xpcomutils.generatensgetfactory ([customcomponent]);  This. Nsgetfactory =xpcomutils.generatensgetfactory ([customcomponent]);} Else {    //For Mozilla 1.9.2 (Firefox 3.6)    varNsgetmodule =Xpcomutils.generatensgetmodule ([customcomponent]);}

(3) Add to Moz.build

# Extra_components installs components written JavaScript to# dist/bin/+ =    [' Customcomponent.js ',    ' customcomponent.manifest ',]

Reference:https://developer.mozilla.org/en-us/docs/mozilla/javascript_code_modules/xpcomutils.jsm

2. C + + Component

Copy from Gecko/xpcom/sample/nssamplemodule.cpp

//////////////////////////////////////////////////////////////////////////Define the Contructor function for the object Nssampleimpl////What this does is defines a function nssampleimplconstructor which we//Would specific in the nsmodulecomponentinfo table. This function would//be used by the generic factory to create a instance of Nssampleimpl.////Note:this creates an instance of Nssampleimpl by using the default//Constructor Nssampleimpl::nssampleimpl ()//ns_generic_factory_constructor (Nssampleimpl)//The following line defines a kns_sample_cid CID variable.ns_define_named_cid (ns_sample_cid);//Build a table of ClassIDs (CIDs) which is implemented by the This module. CIDs//should be completely unique UUIDs.//Each entry have the form {CID, service, Factoryproc, Constructorproc}//where Factoryproc is usually nullptr.Static ConstMozilla::module::cidentry ksamplecids[] = {  { &kns_sample_cid,false, nullptr, Nssampleimplconstructor}, {nullptr}};//Build a table which maps contract IDs to CIDs.//a contract is a string which identifies a particular set of functionality. In some//cases an extension component may override the contract ID of a builtin Gecko component//To modify or extend functionality.Static ConstMozilla::module::contractidentry ksamplecontracts[] ={{Ns_sample_contractid,&Kns_sample_cid}, {nullptr}};//Category entries is category/key/value triples which can be used//To register contract ID as content handlers or to observe certain//notifications. Most modules don't need to register any category//Entries:this is just a sample of what you ' d do it.//@see Nsicategorymanager For information on retrieving category data.Static ConstMozilla::module::categoryentry ksamplecategories[] = {  { "my-category","My-key", Ns_sample_contractid}, {nullptr}};Static ConstMozilla::module Ksamplemodule ={mozilla::module::kversion, ksamplecids, ksamplecontracts, ksamplecategories};//The following line implements the One-and-only ' nsmodule ' symbol exported from this//shared library.Nsmodule_defn (nssamplemodule) = &Ksamplemodule;//The following line implements the One-and-only "Nsgetmodule" symbol//For compatibility with Mozilla 1.9.2. You should//If you need a binary which are backwards-compatible and if you use//interfaces carefully across multiple versions.Ns_impl_mozilla192_nsgetmodule (&ksamplemodule)

(Ffos Gecko)-Several ways of registering a XPCOM Component