郁金香vc基础视频教程31-55合购vip收集-39.串指令

4、串指移动串指令MOVSB、MOVSW、MOVSD;从ESIEDI执行后ESIEDI比较串指令CMPSB、CMPSW、CMPSD;ESI、EDI执行后ESIEDI的地址扫描串指令SCASB、SCASW、SCASD;AL/AX/EAXEDI指向的数据,执行后EDI自动变化串指令:STOSB、STOSW、STOSD;将AL/AX/EAX中的数据到EDI给出的地址,执行后EDI自动变化载入串指令:LODSB、LODSW、LODSD;将ESI指向的数据载入到AL/AX/EAX执行后ESI自动变化B、W、DByte、Word、DWord表示每次操作的数据的大小单位 ECX0REPE(REPZ)ECX0ZF=1REPNE(REPNZECX0ZF=0;重复前缀可以自动按单位(1、2、4)mainmainendpendmainMOVSB:;.modelflat, includelibkernel32.libincludelibmasm32.libincludelibdebug.libszSourcedb'Delphi2010',0lenequ$-szSource-1szDestdblendup(?),0mainprocleaesi,szSourceleaedi,szDestmovecx,lencld;复位标志寄存器的方向标志repPrintStringszDest;Delphi上面的例子,假如不使用重复前缀;.modelflat, includelibkernel32.libincludelibmasm32.libincludelibdebug.libszSourcedb'Delphi2010',0lenequ$-szSource-1szDestdblendup(?),0mainprocleaesi,szSourceleaedi,szDestmovecx,len@@:dececxjnz@BPrintStringMOVSD例;.modelflat, includelibkernel32.libincludelibmasm32.libincludelibdebug.libddSourcedd ddlengthofddSourcemainprocleaesi,leaedi,movecx,lengthofrepDumpMemoffsetddDest,sizeofddDest;11000000-220000-330000mainendpendmainMOVSW例;.modelflat, includelibkernel32.libincludelibmasm32.libincludelibdebug.libddSourcedw dwlengthofddSourcemainprocleaesi,leaedi,movecx,lengthofrepDumpMemoffsetddDest,sizeofddDest;11002200-330000mainendpendmainCMPSD例;.modelflat,;;.modelflat, includelibkernel32.libincludelibmasm32.libincludelibdebug.libddVal1dd1234hddVal2ddmainprocleaesi,ddVal1leaedi,ddVal2jePrintText两数不等jmpL1PrintText两数相等L2:retmainendpendmainCMPSW例 includelibkernel32.libincludelibmasm32.libincludelibdebug.libdwArr1dwdwArr2dwmainprocleaesi,leaedi,movecx,lengthofrepecmpswjeL1PrintText两数组不等jmpL1PrintText两数组相等L2:retmainendpendmain对比数组时,假如数组长度不一致;;.modelflat, includelibkernel32.libincludelibmasm32.libincludelibdebug.libdwArr1dwdwArr2dwmainprocleaesi,leaedi,movecx,lengthofdwArr1cmpecx,lengthofdwArr2jneL1repecmpswjneL1PrintText两数组相等jmpL1PrintText两数组不等L2:retmainendpendmain如果对比的是0结束的字符串, includelibkernel32.libincludelibmasm32.libincludelibdebug.libszText1db'Delphi2010',szText2db'Delphi2011',mainprocleaesi,leaedi,movecx,lengthofrepecmpsbjeL1PrintText字符串不同jmpL1PrintText字符串相同L2:retmainendpendmainSCASB例 includelibkernel32.libincludelibmasm32.libincludelibdebug.libszTextdb'ABCDEFGH',mainprocleaedi,moval,movecx,lengthofszText-repnescasbjeL1PrintText没找到jmpL1:subecx,lengthofszText-negPrintDececx;如果找得到这里显示是第几个字符6L2:retmainendpendmainSTOSB例;.modelflat, includelibkernel32.libincludelibmasm32.libincludelibdebug.liblen=szTextdblendup(0),mainprocleaedi,moval,'x'movecx,lenrepPrintStringszTextmainendpendmainLODSW例:;.modelflat, includelibkernel32.libinc