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1、VisualBasicdesignmultimediaapplications（VisualBasic设计多媒体应用程序）VisualBasicdesignmultimediaapplicationsAuthor:WangXiangyangI.PrefaceWiththecontinuousimprovementofmultimediahardwareenvironmentandsoftwareenvironment,mostofthecomputersoftwaredevelopmentisrelatedt
2、otheapplicationofmultimediasoftwaretechnology.Multimediaapplicationsdesign,inprinciple,canbeusedfromC++tomultimediaspecificdevelopmentsystems(suchasTOOLBOOK,AUTHORWARE,DIRECTOR)andotherlevelsoftools.However,duetothecomplexityanddiversityofmultimediasoftware
3、tothemedia,shortdevelopmentcycleandrequireavarietyofprofessionalsinvolvedin,therefore,inordertodeveloppracticalandefficient,theselectionmustbesimpleandeasytouse,highefficiencyofsoftwaredevelopment.VisualBasicistheWindowsprogrammingtoolsoftwaredevelopedbyMic
4、rosoftcompany.Becauseofitsusewithadvanceddesign,fastandeasytomasterandcontrolthemediaobjectflexiblemeans,ispopularwithmultimediasoftwaredevelopers,hasbecomeanidealtoolformultimediaapplicationdevelopment.Two,VisualBasicmultimediacontrolMCI.OCXMCI(mediacontro
5、linterface)isthestandardofmediacontrolinterfaceprovidedbyMicrosoftcompanytorealizetheequipmentindependenceofWindowssystem.UserscaneasilyusetheMCIcontrolstandardformultimediadevices.MCIisincludedintheMMSYSTEMextensionoftheWindowsmultimediamoduletocoordinatec
6、ommunicationbetweeneventsandbetweenMCIdevicedrivers,providingdeviceindependentinterfaceproperties.UsuallytheapplicationistodistinguishbetweenMCIdevicesbyspecifyingaMCItypeofequipment,equipmenttypeindicatesthephysicaltypeofthecurrentactualuseofequipment,diff
7、erenttypesofequipmentusedtodescribedifferentcontrolproperties(seeTable1).Fromthemodeofcontrolused,theMCIdeviceisdividedintotwocategories:compositeandsimple.AsimpleMCIdevicedoesnotrequiredeviceelements.Forexample,CDaudioandCDmachineisworkinginanalreadyinstal
8、ledontheharddiskofthemediacontent,theydonotneedtheapplicationforitsoperationtoprovideanyinformation.ForcomplexMCIdevices,however,youneedtheapplicationtoprovidedeviceelements,thatis,asourcedatafileordes
