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4684-8appA.f.qc3/3/009:46AMPage697AppendixAWhenBadThingsHappenruescriptingfunalmostalwaysrequiresadditionalCOMobjectstospiceTupthebasicsetsofcommands.Finding,orevenprogramming,suchscriptextensionsisn’thard—you’llfindnumerousexamplesandfullsourcecodeinthisbook.However,beforeyoucanusesuchextensions,you’llneedtoinstallthem.Thisiswherethingscanbecometricky.ICan’tInstallSomeoftheScriptComponents!AllscriptsonCDautomaticallycheckwhetherornottherequiredCOMobjectsarecurrentlyinstalledonyoursystem.IfaCOMobjectismissing,thescriptwon’tsitsilently.Instead,itwilltellyouwhichcomponentismissing,andallyouneedtodoisinstallthecomponentfromthecompanionCD.Butwhatifyoucan’tgetaCOMobjectinstalled?Whatifsomesourcecodewon’tcompile?Onthenextcoupleofpages,I’llprovideyouwithalotofundocumentedbackgrounddetailsthatwillhelpyouunderstand(andresolve)thoseissues.DetailsaboutCOMObjectinstallationTheeasiestwaytogetaCOMobjectworkingobviouslyistheuseofthepreparedinstallpackages.AllyouneedtodoiscallSETUP.EXE,andtheVisualBasicinstallertakescareofeverythingelse.Unfortunately,theinstallerisn’tveryclever.Itworksmostofthetime,butnotalways,andsometimes,itmayevenhavebadsideeffects.ThefirststeptheinstallerneedstodoiscopyingtheOCXfiletoyoursystem.TheOCX-fileisthe“heart”ofyourCOMobject.Theinstallerwon’tcopythisfile,though,ifthere’salreadyafileofthesamenamestoredintheWindowsfolder.Itwon’twarnyou,either.Itjustwon’tinstallthenewOCXcomponentbutstillreport“success”.Sothefirstthingyoushoulddouble-checkiswhetherornottherearealreadyOCXfilesofthenameyouareabouttoinstall.OncetheinstallerhassuccessfullycopiedtheOCX-filetoyoursystem,itregistersthefileautomatically.Registeringmeansthatitwillwriteallthe4684-8appA.f.qc3/3/009:46AMPage698698Appendixes importantobjectinformationintotheWindowsregistry.Mostofthetime,thisworkssmoothly.However,onaWindowsNT/2000system,youmayberequiredtohavetheappropriatepermissions.OnWindows9x-systems,acorruptregistrymayrefusetoacceptthenewregistrationi
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