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1、外文原文FromonecodebasetomanyplatformsusingVisualC++Multiple-platformdevelopmentisahotissuetoday.DeveloperswanttobeabletosupportdiverseplatformssuchastheMicrosoft®Windows®version3.x,MicrosoftWindowsNT®,andMicrosoftWindows95operatingsystems,andApple®,Macintosh®,UN
2、IX,andRISC(reducedinstructionsetcomputer)machines.Untilrecently,developerswantingtobuildversionsoftheirapplicationformorethanoneplatformhadfewchoices:·Maintainseparatecodebasesforeachplatform,writtentotheplatform'snativeapplicationprogramminginterface(API).·W
3、ritetoa"virtualAPI"suchasthoseprovidedbycross-platformtoolsets.·Buildtheirownmultiple-platformlayerandsupportit.Today,however,anewchoiceexists.DeveloperscanusetheirexistingcodewrittentotheWindowsAPIand,usingtoolsavailablefromMicrosoftandthirdparties,recompile
4、foralloftheplatformslistedabove.Thispaperlooksatthemethodsandsomeoftheissuesinvolvedindoingso.Currentlythemostlucrativemarketforgraphicaluserinterface(GUI)applications,afterMicrosoftWindows,istheAppleMacintosh.However,vastdifferencesseparatethesewhollydiffere
5、ntoperatingsystems,requiringdeveloperstolearnnewAPIs,programmingparadigms,andtools.Generally,MacintoshdevelopmentrequiresaseparatecodebasefromtheWindowssources,increasingthecomplexityofmaintenanceandenhancement.BecauseportingcodefromWindowstotheMacintoshcanbe
6、themostdifficultportingcase,thispaperconcentratesinthisarea.Ingeneral,ifyourcodebaseissufficientlyportabletoenablestraightforwardrecompilingfortheMacintosh(excludinganyplatform-specific,or"edge"code,youmayelecttoinclude),you'llfindthatitwillcomeuponotherplatf
7、ormseasilyaswell.MicrosoftVisualC++®Cross-DevelopmentEditionforMacintosh(VisualC++forMac™)providesasetofWindowsNT–orWindows95–hostedtoolsforrecompilingyourWindowscodefortheMotorola680x0andPowerPCprocessors,andaportabilitylibrarythatimplementsWindowsontheMacin
8、tosh.ThisallowsyoutodevelopGUIapplicationswithasinglesourcecodebase(writtentotheWin32®API)andimplementitonMicrosoftWindowsorAppleMacintoshplatforms.Figure1,below,illustrateshowVisualC++fo
