shl,shr 移位处理字模提取的数据

来源：互联网发布：美工师编辑：程序博客网时间：2024/04/26 03:05

assume cs:code
data segment
DB 002H,000H,012H,000H,002H,000H,012H,010H,002H,010H,022H,030H,07FH,0F8H,062H,0C0H
DB 042H,010H,0A3H,000H,042H,011H,02EH,008H,042H,010H,022H,008H,042H,010H,021H,0F8H
DB 07FH,0F0H,024H,000H,002H,000H,004H,000H,002H,001H,0FFH,0F8H,002H,000H,004H,000H
DB 002H,000H,004H,000H,002H,000H,004H,000H,000H,000H,000H,000H,000H,000H,000H,000H
db 512 dup(0)
data ends
code segment
start:mov ax,data
      mov ds,ax
      mov si,0
      mov di,64 ;空内存段的首地址

      mov cx,64   ;data段总共32个字节
   s: mov al,ds:[si]
      call change
      inc si
      loop s
       mov di,64   ;转化后的数据填充到内存段的首地址
      call show

     mov ax,4c00h
     int 21h
;名称：change
;功能：利用移位的原理(利用标志寄存CF位）将每个字节的八位提取出来，放到ds:[di]
;参数：ds:[si]=字符串首地址，ds:[di]=转化后数据存放的地址
change: push cx

         mov cx,8
   chgs: shl al,1
         pushf
pop bx
and bx,00000001b
mov ds:[di],bl
inc di
loop chgs
          pop cx
ret

;名称：show
;功能：按字节显示字符，当为0时显示*，当为1时显示笑脸
;参数：ds:[di]指向字符串首地址
   show:push ax
        push cx
push si
        mov ax,0b800h
        mov es,ax
mov bx,5*160
mov si,2*10
mov cx,16     ;总共16行
shows0: push cx
mov cx,32    ;总共32列
shows1:mov al,ds:[di]
cmp al,1
jne next
mov byte ptr es:[bx+si],03h;为1则将此处变为红心
mov byte ptr es:[bx+si+1],04h
inc di
        add si,2
       loop shows1
       add bx,160
       mov si,2*10
       pop cx
       loop shows0

   next:mov byte ptr es:[bx+si],0 ;为0则将此处变为0
        inc di
add si,2
loop shows1
add bx,160
mov si,2*10
pop cx
loop shows0
     pop si
     pop cx
     pop ax
     ret

code ends
end start