【匯編】常用的DOS功能調用

 

 

 

 

 

 

.386
DATA1 SEGMENT USE16
BUF DB 0AH,0DH, 'I WISH YOU SUCCESS!$'
DATA1 ENDS

CODE SEGMENT USE16
    ASSUME CS:CODE,DS:DATA1
START:
    MOV AX,DATA1
    MOV DS,AX
    
    MOV DL,31H
    MOV AH,2
    INT 21H

    MOV AH,4CH
    INT 21H
CODE ENDS
END START

 

 從DS段開始偏移DX，遇到‘$’字符結束

 

.386
DATA1 SEGMENT USE16
BUF DB 0AH,0DH, 'I WISH YOU SUCCESS!$'   ;0AH,0DH回車換行
DATA1 ENDS

CODE SEGMENT USE16
    ASSUME CS:CODE,DS:DATA1
START:
    MOV AX,DATA1
    MOV DS,AX
    
    LEA DX, BUF
    MOV AH, 9
    INT 21H

    MOV AH,4CH
    INT 21H
CODE ENDS
END START

 

 

.386
DATA1 SEGMENT USE16
T1 DB 'abcdef'
T2 DB 31H,32H,33H,'$',34H,35H
DATA1 ENDS

CODE SEGMENT USE16
    ASSUME CS:CODE,DS:DATA1
START:
    MOV AX,DATA1
    MOV DS,AX
    
    LEA DX,T1
    MOV AH,9
    INT 21H

    MOV AH,4CH
    INT 21H
CODE ENDS
END START

輸出：abcdef123

.386
DATA1 SEGMENT USE16
T1 DB 'abcdef'
T2 DB 31H,32H,33H,34H,35H,'$'
DATA1 ENDS

CODE SEGMENT USE16
    ASSUME CS:CODE,DS:DATA1
START:
    MOV AX,DATA1
    MOV DS,AX
    
    LEA DX,T1
    MOV AH,9
    INT 21H

    MOV AH,4CH
    INT 21H
CODE ENDS
END START

輸出：abcdef12345

 

輸出：abcdef

 

10號調用

 

 

.386
DATA1 SEGMENT USE16
T1 DB 11
   DB ?
   DB 11 DUP(0)
T2 DB 31H,32H,33H,34H,35H,'$'
DATA1 ENDS

CODE SEGMENT USE16
    ASSUME CS:CODE,DS:DATA1
START:
    MOV AX,DATA1
    MOV DS,AX

    LEA DX,T1
    MOV AH,10
    INT 21H
    
    LEA DX,T1
    MOV AH,9
    INT 21H

    MOV AH,4CH
    INT 21H
CODE ENDS
END START

輸入：1234567890

輸出：1234567890

 

.386
DATA1 SEGMENT USE16
T1 DB 10,5 dup(0)；  10表示緩沖區最多能輸入是字符個數，還要減一
str DB 1,2,3
T2 DB 31H,32H,33H,34H,35H,'$'
DATA1 ENDS

CODE SEGMENT USE16
    ASSUME CS:CODE,DS:DATA1
START:
    MOV AX,DATA1
    MOV DS,AX

    LEA DX,T1
    MOV AH,10
    INT 21H
    
    LEA DX,T1
    MOV AH,9
    INT 21H

    MOV AH,4CH
    INT 21H
CODE ENDS
END START

打開TD 調試

輸入：abcdefgi

 

OA后面的09表示9個，原來的1，2，3被覆蓋掉，相當於數組越界，到 0D 結束