英文 VC程序中使用脚本引.docx

英文 VC程序中使用脚本引.docx

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英文VC程序中使用脚本引

ActiveXScriptinginMFC

BySteveWampler

LikeMicrosoftInternetExplorer,yourapplicationscansupportVBScript（VisualBasicScriptingEdition）andJScript（JavaScript）withverylittleeffortonyourpart.MicrosofthasdonemostoftheworkbyprovidingVBScriptandJScriptenginesandbydefiningtheActiveXscriptingCOMinterfacesthatenableyoutousetheengineswithinyourapplications.

We'lltakeMicrosoft'sworkonestepfurtherwithanMFC-likeC++classcalledCScriptEnginethatimplementstheActiveXscriptinginterfacesinthecontextofasampleMFCapplication.

YoushouldbefamiliarwithMFCandautomation.Ifnot,readuponbothintheVisualC++onlinedocumentation.

NotethatforActiveXscriptingtoworkinyourMFCapplications,yourVisualC++environmentmustbeversion4.2b.The4.2bupgradepatchisavailablefromMicrosoftatunder"DownloadsandPatches."YoumustalsohavetheVBScriptandJScriptDLLsthatcomewithInternetExplorer.YoucandownloadtheDLLsfromMicrosoftat

WhyActiveXscripting?

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"AutomationenablesautomationclientssuchasVisualBasictouseyourapplications.ButwhywouldyouwantyourapplicationtosupportActiveXscriptingaswell?

Theanswerdependsonyourapplication."

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AutomationenablesautomationclientssuchasVisualBasictouseyourapplications.ButwhywouldyouwantyourapplicationtosupportActiveXscriptingaswell?

Theanswerdependsonyourapplication.

Forexample,ifyourapplicationisanActiveXcontrolcontaineryouruserswilllikelywanttowritescriptsthataccessthecontrols'automationevents,properties,andmethods.Yourusersmayalsowanttheirscriptsstoredwithintheapplication'sdocuments.Andfinally,theylikelywantachoiceinscriptinglanguages.ByaddingsupportforActiveXscripting,yourapplicationscandoallofthesethings.Let'sexamineasampleapplicationcalledScriptTesttoseehow.

TheScriptTestapplicationfromtheuser'sperspective

ScriptTestisaHello,World!

–typeapplication.It'sasimpleSingleDocumentInterface（SDI）applicationgeneratedusingtheMFCAppWizard.Here'swhatScriptTestlookslikeinaction:

ToeditandrunaScriptTestscript,youinvoketheEnterScriptdialogbyselectingRunfromtheScriptmenu.Here'swhattheEnterScriptdialoglookslike:

IntheScriptTypebox,youchooseVBScriptorJScript.Youenterthescript'stextintheScripteditcontrol.

Togiveitatry,downloadtheScriptTestapplicationfromtheVCDJweb-siteandrunit.Fromthemenubar,selectScriptandRun,andenterthefollowingVBScript:

SubSayGoodbye

Document.Text="Goodbye,World!

"

EndSub

SayGoodbye

PressOKtorunthescript.

ThisVBScriptdeclaresaSayGoodbyesubroutinethatsimplysetsthedocument'sTextproperty（describedshortly）to"Goodbye,World!

"ThescriptthencallstheSayGoodbyesubroutine.Afterrunningthescript,ScriptTestdisplays"Goodbye,World!

"

ScriptTestfromaprogrammer'sperspective

WeenabledActiveXscriptinginScriptTestintwosteps:

first,weaddanautomationmethod,andapropertyinScriptTest'sdocumentclass,CScriptTestDoc,gaveascriptsomethingtodo;second,twoC++classesenabledScriptTesttocreateanduseanActiveXscriptingengine.

Step1:

automatingtheScriptTestapplication.BeforeaddingsupportforActiveXscripting,weusetheVisualC++ClassWizardtoaddanautomationpropertycalledTextandamethodcalledMsgBox（）toScriptTest'sCScriptTestDocclass.TheTextpropertyisheldinaCStringvariablewithinScriptTest'sdocumentclass.ItsvalueiswhatyouseewritteninScriptTest'swindow.

InVBScript,youcangetandsetthedocument'sTextpropertylikeso:

'gettheTextproperty

strText=Document.Text

'settheTextproperty

Document.Text="Goodbye,World!

"

TheMsgBox（）methodtakesonestringparametercontainingthemessagetext.Forexample,theVBScriptstatementDocument.MsgBox（"Goodbye,World!

"）causestheScriptTesttodisplaythefollowingmessage:

Step2:

creatingandusingascriptingengine.TocreateanduseanActiveXscriptingengine,ScriptTestincludestheclassesCScriptEngineandCScriptTestScriptEngine.

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"TheCScriptEngineclassisanMFC-likewrapperaroundanActiveXscriptingengine.It'sgeneralenoughthatyoushouldbeabletoreuseitinotherMFCapplications."

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TheCScriptEngineclassisanMFC-likewrapperaroundanActiveXscriptingengine.It'sgeneralenoughthatyoushouldbeabletoreuseitinotherMFCapplications