系统级编程-lab

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1、WORD资料下载可编辑LaboratoryTwo–DecodingLab(Part1)Objectives:Forthisexercise,youhavetocompileaprogramasattachedandsupplyfoursecretkeystodeterminethecontents.Inthislaboratory,youhavetosupplythefirsttwo.Theremainingwillbedonenextweek.Iwillguideyoutosolvetheproblem.ThisexerciseisextractedfromtheCTE,S

2、SD6–Exerciseone.Thedetailsareasfollows.Starttheprogram:1)invokethevisualC++andusenewtostarttheworkplace.2)SelecttheNewMenuandclick“workplace”.Thenameiscalledexercise13)Theprojectisexercise1:SelectWin32Console专业资料整理分享WORD资料下载可编辑1)Theoutputafterselectingtheprojectisasfollows.2)Selecttheemptyb

3、uttonuntilyouseethefollowingscreen3)NowSelectNewagainandthenFiles,typethenameoffile“Exercise1”andselectC++sourcefile.专业资料整理分享WORD资料下载可编辑1)Clickthefileviewandthesourcefilesyouwillseeexercise1.cppisthere,butisempty.2)Nowyoudownloadthesecretfile(secret.cpp)fromCTEwebsiteorgetitfromappendix.专业资

4、料整理分享WORD资料下载可编辑1)Compiletheprogramwithoutanybug.Setabreakpoint:Setabreakpointtoforcetheprogramtobreak,pressF9.Agoodprogrammermustknowhowtodebug.1)PressF9atthelocationofintdummyundermain()2)NowClickDebugandchoosestartdebugthengo,youwillseethescreen专业资料整理分享WORD资料下载可编辑Itmeanstheprogramstopsat

5、thislocation,Youcannowdummythemessagetoanalysisthedata.1)Rightclickyourmouseandyouwillgetascreenasfollows:2)Selectquickwatchandyouwillseeaquickwatch专业资料整理分享WORD资料下载可编辑1)TypethedataandwritetheaddressAddressofdatais:_______0x00424ab0______(hint:inhex,ox……..)2)Intheaddressscreen:Enterthevalueo

6、ftheaddressofdata:0x00424ab0__________.Youcanseethevalueofontherighthandside.专业资料整理分享WORD资料下载可编辑Writedownthefirst40characters.cccccccccFFrromo:mFr:iendCTTo：EYouTDeterminethevalueofstartandstride:[Hint]Nowyoufindthatifyoucanextractthemessage,pickthestartmessageandthenthestride(afterhowmanych

7、aractersforthenext),youcanthenguesshowtodetermineit.Forexample,1234567890AStart:0andstride:2,willproduce13579AStart:0andstride:3,willproduce1245780AStart:0andstride:4,willproduce12356790AStart:1andstride:3,willproduce235689AIfyouchoosethevalueproperly,yo