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majidkamali1370



Joined: 31 Oct 2010
Posts: 50
Location: Iran
majidkamali1370
Hi.
I created a Header.inc file, which has below content

;;*********************************
PrintChar:
mov ah, 2
int 21
ret
;;*********************************

and an asm file that has below content

;;*********************************
org 100h
include 'Header.inc'

mov dl, 'A'
jmp PrintChar
;;*********************************

but when I run the com file it does not print 'A' on the screen.
Instead it prints 'P' on the screen.
What's the problem?
Can I create a procedure without using windows proc macros?

Thanks Very Happy
Post 06 Nov 2011, 16:39
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17714
Location: In your JS exploiting you and your system
revolution
'Include' will include the external file just as if you had typed it directly
Code:
org 100h
;include 'Header.inc'

  PrintChar:
  mov ah, 2
  int 21
  ret

mov dl, 'A'
jmp PrintChar    
Post 06 Nov 2011, 16:43
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majidkamali1370



Joined: 31 Oct 2010
Posts: 50
Location: Iran
majidkamali1370
there are 2 files. first, header.inc and the second, project.asm file.
I don't know why it does not work.
Actually I want to create a function that prints a character and be in another file.
Post 06 Nov 2011, 16:52
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17714
Location: In your JS exploiting you and your system
revolution
majidkamali1370: Look at the code I posted above. That is exactly what fasm assembles.

If you need me to give you a direct answer then do this:
Code:
org 100h

mov dl, 'A'
jmp PrintChar

include 'Header.inc'    
Post 06 Nov 2011, 17:06
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majidkamali1370



Joined: 31 Oct 2010
Posts: 50
Location: Iran
majidkamali1370
Thanks. It works. but in big projects, should I include all header files at the end?
Post 06 Nov 2011, 19:55
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17714
Location: In your JS exploiting you and your system
revolution
You need to understand what include does. It inserts the text of the included file directly at the place of the include directive.

This would also work:
Code:
org 100h
jmp start: ;skip over the included code

include 'Header.inc' ;include our print function here

start:
mov dl, 'A'
jmp PrintChar    
Post 06 Nov 2011, 20:04
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AsmGuru62



Joined: 28 Jan 2004
Posts: 1419
Location: Toronto, Canada
AsmGuru62
You need CALL - not a JMP.

Also, JMP START: may trigger anti-virus.
You can include all functions at the end of COM file:
Code:
org 100h
...

include 'Module1.asm'
include 'Module2.asm'
include 'Module3.asm'
    


Last edited by AsmGuru62 on 08 Nov 2011, 18:04; edited 1 time in total
Post 07 Nov 2011, 15:38
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edfed



Joined: 20 Feb 2006
Posts: 4242
Location: 2018
edfed
depending on what is in your header, you can also do that:
Code:
include 'header.inc'
mov dl,'A'
call printchar
ret
    


it will let you separate system specific code and applications codes.

Header.inc
Code:
org 100h
call start
ret ;quit the program
include 'printchar.inc'
start:
    
Post 07 Nov 2011, 20:35
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