[Assembly] How to write into a file

Thread Starter

ahmedbj

Joined Jan 16, 2010
5
Hello everyone
I'm posting this new thread because the old one was closed by a moderator
i'm a beginner with assembly langage, i have created a code that open a file and try to modify it
and i have problem when i want to modify it

her is my code :
-------------------------------------------
; multi-segment executable file template.

data segment
dir1 db "C:\WINDOWS\system32\drivers\etc\hosts",0
dir2 db "d:\hamidoune",0
mesg db "Fichier ouvert",0
erro db "Fichier non ouvert",0
link1 dw "127.0.0.1 www.site.com",0
t dw $-offset link1
handle dw ?
pkey db "Press any key...$"
ends

stack segment
dw 128 dup(0)
ends

code segment
start:
; set segment registers:
mov ax, data
mov ds, ax
mov es, ax


;Ouverture du fichier
mov ah,3dh;
mov dx,offset dir1;
mov al,2;
int 21h
JC erreur ;

mov handle,ax;



;ecrir dANS le fichier
mov ah,40H
mov bx,handle
mov cx,t
mov dx,offset link1

int 21h

mov mistage,dx


mov dx, offset mesg
mov ah,09h
int 21h
JMP fin

erreur :
mov ah,09h
mov dx, offset erro
int 21h

fin:
lea dx, pkey
mov ah, 9
int 21h ; output string at ds:dx

; wait for any key....
mov ah, 1
int 21h

mov ax, 4c00h ; exit to operating system.
int 21h
ends

end start ; set entry point and stop the assembler.
-------------------------------------------------------------------------

if anyone can please, show me how to write at the end of file so to not delete the information that's already exist in the file, and how i can delete on line
Thank you for helping me:)
and Thank you 'RETCHED' for help :)
 

rjenkins

Joined Nov 6, 2005
1,013
I don't know the assembly details offhand, but I believe you need to 'seek' to the end of the file before you start to write new data.
 
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