【汇编】常用的DOS功能调用

 

 

 

 

 

 

.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

 

 从DS段开始偏移DX，遇到‘$’字符结束

 

.386
DATA1 SEGMENT USE16
BUF DB 0AH,0DH, 'I WISH YOU SUCCESS!$'   ;0AH,0DH回车换行
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

输出：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

输出：abcdef12345

 

输出：abcdef

 

10号调用

 

 

.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

输入：1234567890

输出：1234567890

 

.386
DATA1 SEGMENT USE16
T1 DB 10,5 dup(0)；  10表示缓冲区最多能输入是字符个数，还要减一
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

打开TD 调试

输入：abcdefgi

 

OA后面的09表示9个，原来的1，2，3被覆盖掉，相当于数组越界，到 0D 结束