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Copyright©1998byCharlieCalvertChapter17:OLEAutomationThistextisanexcerptfromtheupcomingbook:C++Builder3.0Unleashed.Copyright©1998byCharlieCalvertOverviewThisgoalofthischapterandthenextistogetyouuptospeedusingOLEAutomationandDCOM.Bythetimeyouarefinishedreadingthismaterial,youshouldfeelasthoughitiseasyforyoutowriteAutomationandDCOMprograms.Subjectscoveredinthischapterinclude:??CreatingInterfaces??WorkingwithDualInterfaces,IDispatchanddispinterfaces.??MarshallingData??TypeLibrariesandIDL??CreatingAutomationPrograms??TalkingtoWordandExcelIwillalsoincludeanintroductiontoCOM.IfyouareinterestedinamoreindepthdiscussionofCOMandrelatedissues,youshouldturntoGeorgeCross’scoverageofthesubjectinChapter19,“UsingActiveXComponents”,andChapter20,“CreatingNewActiveXComponents.”ThischapterwilldiscussmanydifferentaspectsofCOMprogramming.However,theprimaryfocuswillbeonAutomation.Automationisatechnologywhichallowsyoutocontroloneprogramfrominsideasecondprogram.Oneofthekeygoalsofthetechnologyistoallowyoutoworkwithsuitesofwellcoordinatedtools.Aswemoveontotheinternet,thesesuitesoftoolscanbedistributedacrossanetwork.Ultimately,thesedisparateapplicationsandobjectscanbewoventogetherintoatapestrythatmirrorstherealworldfunctionalityofcomplexsystemssuchascorporations,games,orevenlargescalesocialorganizationssuchascitiesorgovernments.ANoteonLanguageTheMicrosoftmarketingdepartmenthashadabitofastruggledecidingonhowtheywanttopresentCOMtotheworld.Withoutgettingintothedetailsofexactlyhowthisconfusionemerged,IwanttosayafewwordsabouthowIusethetermsthrownaboutthemarketeersinRedmond,WA.Inthisbook,IwillusuallyuseCOMandOLEasinterchangeableterms,exceptforafewoccasionswhenIwillspecificallyrefertoasubsetofCOMthathastodowithlinkingdocumentstogetherinwhatiscalledObjectLinkingandEmbedding.ThiscomplicatedandfairlyinterestingfieldwasoncethewholerealmofOLE,butitisnownothingmorethanasideshow.C++Builder3.0UnleashedPage12000-11-6Copyright©1998byCharlieCalvertActive
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