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附录1外文原文[8]TheWindowsProgrammingModelNomatterwhichdevelopmenttoolsyouuse,programmingforWindowsisdifferentfromold-stylebatch-orientedortransaction-orientedprogramming.Togetstarted,youneedtoknowsomeWindowsfundamentals.Asaframeofreference,we'llusethewell-knownMS-DOSprogrammingmodel.Evenifyoudon'tcurrentlyprogramforplainMS-DOS,you'reprobablyfamiliarwithit.MessageProcessingWhenyouwriteanMS-DOS-basedapplicationinC,theonlyabsoluterequirementisafunctionnamedmain.Theoperatingsystemcallsmainwhentheuserrunstheprogram,andfromthatpointon,youcanuseanyprogrammingstructureyouwant.Ifyourprogramneedstogetuserkeystrokesorotherwiseuseoperatingsystemservices,itcallsanappropriatefunction,suchasgetchar,orperhapsusesacharacter-basedwindowinglibrary.WhentheWindowsoperatingsystemlaunchesaprogram,itcallstheprogram'sWinMainfunction.SomewhereyourapplicationmusthaveWinMain,whichperformssomespecifictasks.Itsmostimportanttaskiscreatingtheapplication'smainwindow,whichmusthaveitsowncodetoprocessmessagesthatWindowssendsit.AnessentialdifferencebetweenaprogramwrittenforMS-DOSandaprogramwrittenforWindowsisthatanMS-DOS-basedprogramcallstheoperatingsystemtogetuserinput,butaWindows-basedprogramprocessesuserinputviamessagesfromtheoperatingsystem.NOTEManydevelopmentenvironmentsforWindows,includingMicrosoftVisualC++version6.0withtheMicrosoftFoundationClass(MFC)Libraryversion6.0,simplifyprogrammingbyhidingtheWinMainfunctionandstructuringthemessage-handlingprocess.WhenyouusetheMFClibrary,youneednotwriteaWinMainfunctionbutitisessentialthatyouunderstandthelinkbetweentheoperatingsystemandyourprograms.MostmessagesinWindowsarestrictlydefinedandapplytoallprograms.Forexample,aWM_CREATEmessageissentwhenawindowisbeingcreated,aWM_LBUTTONDOWNmessageissentwhentheuserpressestheleftmousebutton,aWM_CHARmessageissentwhentheusertypesacharacter,andaWM_CLOSEmessageissentwhentheuserclosesawindow.Allmessageshavetwo32-bitparametersthatconveyinformationsuchascursorcoordinates,keycode,andsoforth.WindowssendsWM_COMMANDmessagesto
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