Chapter Two Windows Programming and MFC Application Framework.ppt

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1、C++ProgrammingChaper7WindowsProgrammingandMFCIntroducingIndex7.1TheWindowsProgrammingModel7.1.1MessageProcessing7.1.2Handles7.1.3WindowsAPIs7.1.4AWindowsProgram7.2IntroducingMFC7.2.1TheVisualC++Components7.2.2MFCApplicationFramework7.1TheWindowsProgrammingModelProgramswritte

2、nfortraditionaloperatingenvironmentsuseaproceduralprogrammingmodelinwhichprogramsexecutefromtoptobottominanorderlyfashion.Thepathtakenfromstarttofinishmayvarywitheachinvocationoftheprogramdependingontheinputitreceivesortheconditionsunderwhichitisrun,butthepathremainsfairlypr

3、edictable.InaCprogram,executionbeginswiththefirstlineinthefunctionnamedmainandendswhenmainreturns.Inbetween,mainmightcallotherfunctionsandthesefunctionsmightcallevenmorefunctions,butultimatelyitistheprogram—nottheoperatingsystem—thatdetermineswhatgetscalledandwhen.7.1TheWind

4、owsProgrammingModelWindowsprogramsoperatedifferently.Theyusetheevent-drivenprogrammingmodel,inwhichapplicationsrespondtoeventsbyprocessingmessagessentbytheoperatingsystem.Aneventcouldbeakeystroke,amouseclick,oracommandforawindowtorepaintitself,amongotherthings.7.1TheWindowsP

5、rogrammingModel7.1.1MessageProcessingWheredomessagescomefrom,andwhatkindsofinformationdotheyconvey?Windowsdefineshundredsofdifferentmessagetypes.Mostmessageshavenamesthatbeginwiththeletters"WM"andanunderscore,asinWM_CREATEandWM_PAINT.OnewaytocharacterizeaWindowsprogramistoth

6、inkofitasacollectionofmessagehandlers.Toalargeextent,itisaprogram'suniquewayofrespondingtomessagesthatgivesititspersonality.typedefstructtagMSG{HWNDhwnd;UINTmessage;WPARAMwParam;LPARAMlParam;DWORDtime;POINTpt;}MSG;7.1.1MessageProcessingCommonWindowsMessagesMessageSentWhenWM_

7、CHARAcharacterisinputfromthekeyboard.WM_COMMANDTheuserselectsanitemfromamenu,oracontrolsendsanotificationtoitsparent.WM_CREATEAwindowiscreated.WM_DESTROYAwindowisdestroyed.WM_LBUTTONDOWNTheleftmousebuttonispressed.WM_LBUTTONUPTheleftmousebuttonisreleased.WM_MOUSEMOVEThemouse

8、pointerismoved.WM_PAINTAwindowneedsrepainting.WM_QUITTheapplicationisaboutt