系统级编程-lab

《系统级编程-lab》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。

1、LaboratoryTwo–DecodingLab(Part1)Objectives:Forthisexercise,youhavetocompileaprogramasattachedandsupplyfoursecretkeystodeterminethecontents.Inthislaboratory,youhavetosupplythefirsttwo.Theremainingwillbedonenextweek.Iwillguideyoutosolvetheproblem.ThisexerciseisextractedfromtheCTE,SSD6–

2、Exerciseone.Thedetailsareasfollows.Starttheprogram:1)invokethevisualC++andusenewtostarttheworkplace.2)SelecttheNewMenuandclick“workplace”.Thenameiscalledexercise13)Theprojectisexercise1:SelectWin32Console121)Theoutputafterselectingtheprojectisasfollows.2)Selecttheemptybuttonuntilyous

3、eethefollowingscreen3)NowSelectNewagainandthenFiles,typethenameoffile“Exercise1”andselectC++sourcefile.121)Clickthefileviewandthesourcefilesyouwillseeexercise1.cppisthere,butisempty.2)Nowyoudownloadthesecretfile(secret.cpp)fromCTEwebsiteorgetitfromappendix.121)Compiletheprogramwithou

4、tanybug.Setabreakpoint:Setabreakpointtoforcetheprogramtobreak,pressF9.Agoodprogrammermustknowhowtodebug.1)PressF9atthelocationofintdummyundermain()2)NowClickDebugandchoosestartdebugthengo,youwillseethescreen12Itmeanstheprogramstopsatthislocation,Youcannowdummythemessagetoanalysisthed

5、ata.1)Rightclickyourmouseandyouwillgetascreenasfollows:2)Selectquickwatchandyouwillseeaquickwatch121)TypethedataandwritetheaddressAddressofdatais:_______0x00424ab0______(hint:inhex,ox……..)2)Intheaddressscreen:Enterthevalueoftheaddressofdata:0x00424ab0__________.Youcanseethevalueofont

6、herighthandside.12Writedownthefirst40characters.cccccccccFFrromo:mFr:iendCTTo：EYouTDeterminethevalueofstartandstride:[Hint]Nowyoufindthatifyoucanextractthemessage,pickthestartmessageandthenthestride(afterhowmanycharactersforthenext),youcanthenguesshowtodetermineit.Forexample,12345678

7、90AStart:0andstride:2,willproduce13579AStart:0andstride:3,willproduce1245780AStart:0andstride:4,willproduce12356790AStart:1andstride:3,willproduce235689AIfyouchoosethevalueproperly,youwillget:Startvalue:indecimalinordertoproducetheabovemessageis___9____12Stride:lengthofnextcharacter(

8、Hint:Youhave