插件编程框架Pluginsarethecommonwayforextendingapplications.TheyareusuallyimplementedasDLLs.Thehostapplicationlocatestheplugins(eitherbylookinginapredefinedfolder,orbysomesortofregistrysettingorconfigurationfile)thenloadsthemonebyonewithLoadLibrary.Thepluginsarethenintegratedintothehosta