Question

Hello everyone, say if I'm to have a "text.txt" file that has something like "Hello,world". Can you show me a program to read this file and then print it out? Thank you! Written in MASM x86 assembly language please!

Answer 1

The following code reads the file with the name

.MODEL SMALL
.STACK 100H
.DATA
FILENAME DB 'text.txt',0
HANDLE DW ?
MSG DB 'Hello,World'
BUFFER DB 25 DUP(?)
COUNT DB 20 ;displaying 20 bytes of information. change according to your requirement
.CODE 
MAIN PROC
MOV AX,@DATA
MOV DS,AX

;***************OPENING AN EXISTING FILE***************;
MOV AH,3DH
MOV DX,OFFSET(FILENAME)
MOV AL,1  ; 1 MEAN FOR WRITING PURPOSE 
INT 21H
MOV HANDLE,AX

MOV AH,40H
MOV BX,HANDLE
MOV CX,25
MOV DX, OFFSET(MSG)
INT 21H

MOV AH,3EH
MOV DX,HANDLE
INT 21H

;***************OPENING A FILE FOR READING***************;
MOV AH,3DH
MOV DX,OFFSET(FNAME)
MOV AL,0  ; 1 MEAN FOR WRITING PURPOSE 
INT 21H
MOV HANDLE,AX

MOV AH,3FH
MOV BX,HANDLE
MOV DX,OFFSET(BUFFER)
MOV CX,10
INT 21H

;***************DISPLAYING 10 BYTES***************;
MOV SI,OFFSET(BUFFER)
L1:
MOV AH,2
MOV DL,[SI]
INT 21H
INC SI
DEC COUNT
JNZ L1
 ;***************CLOSING A FILE***************; 
;MOV AH,3EH 
;MOV DX,HANDLE 
;INT 21H

MOV AH,4CH
INT 21H
MAIN ENDP
END MAIN