Archives and Serializations Programming Guide

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1、ArchivesandSerializationsProgrammingGuideContentsIntroduction5OrganizationofThisDocument5ObjectGraphs6Archives8Serializations8Archives9Coders9RootObject10ConditionalObjects10KeyedArchives11NamingValues11ReturnValuesforMissingKeys11TypeCoercions12ClassVersioning12RootObjects12Delegates1

2、2Non-KeyedCodingMethods12CreatingandExtractingArchives13CreatinganArchive13DecodinganArchive14EncodingandDecodingObjects16EncodinganObject16DecodinganObject17PerformanceConsiderations18MakingSubstitutionsDuringCoding18RestrictingCoderSupport19EncodingandDecodingCDataTypes21Pointers21Ar

3、raysofSimpleTypes212012-07-17

4、Copyright©2002,2012AppleInc.AllRightsReserved.2ArraysofObjects22StructuresandBitFields22MoreComplexDataTypes23ForwardandBackwardCompatibilityforKeyedArchives24BenefitsofKeyedArchiving24GeneralTipsonMaintainingCompatibility25AddingNewValuestoKeys25AddingNew

5、Keys25RemovingorRetiringKeys26ChangingBitSizesofValues27SubclassingNSCoder29SerializingPropertyLists31DocumentRevisionHistory332012-07-17

6、Copyright©2002,2012AppleInc.AllRightsReserved.3FiguresObjectGraphs6Figure1Partialobjectgraphofanapplication72012-07-17

7、Copyright©2002,2012AppleInc.A

8、llRightsReserved.4IntroductionArchivesandserializationsaretwowaysinwhichyoucancreatearchitecture-independentbytestreamsofhierarchicaldata.Bytestreamscanthenbewrittentoafileortransmittedtoanotherprocess,perhapsoveranetwork.Whenthebytestreamisdecoded,thehierarchyisregenerated.Archivespro

9、videadetailedrecordofacollectionofinterrelatedobjectsandvalues.Serializationsrecordonlythesimplehierarchyofproperty-listvalues.Youshouldreadthisdocumenttolearnhowtocreateandextractarchivedrepresentationsofobjectgraphs.OrganizationofThisDocumentThisprogrammingtopiccontainsthefollowingar

10、ticles:●“ObjectGraphs”(page6)introducestheconceptofanobjectgraphanddiscussesthetwotechniquesforturningobjectsintobytestreams:archivesandserializations.●“Archives”(page9)describesthedifferenttypesofarchiveandarchiverclasses.●“CreatingandExtractingArchives”(page13)describeshowtocreatea