Problem with DUP

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Cthulhu

Joined: 12 May 2005
Posts: 29

Cthulhu 13 May 2005, 17:48

How can I declare a variable and initialize it with zeros like DUP in Masm and Tasm?

In Masm I would code it this way:

Code:

.386
.model flat, stdcall
option casemap:none

include d:\masm32\include\windows.inc
include d:\masm32\include\kernel32.inc
includelib d:\masm32\lib\kernel32.lib

.data
        WinDir db MAX_PATH dup(0)
        
.code   
start:
        push MAX_PATH
        push offset WinDir
        call GetWindowsDirectoryA
        
        push 0
        call ExitProcess
end start

I can't manage to do the same with Fasm Confused

13 May 2005, 17:48

JohnFound

Joined: 16 Jun 2003
Posts: 3499
Location: Bulgaria

JohnFound 13 May 2005, 18:02

Code:

WinDir  rb  MAX_PATH

"rb" means "reserve bytes"

13 May 2005, 18:02

Cthulhu

Joined: 12 May 2005
Posts: 29

Cthulhu 13 May 2005, 18:09

Thanks friend

13 May 2005, 18:09

YONG

Joined: 16 Mar 2005
Posts: 7997
Location: 22° 15' N | 114° 10' E

YONG 14 May 2005, 07:52

The code

Code:

WinDir  rb  MAX_PATH

simply reserves MAX_PATH bytes of space. It does not initialize
those bytes to zero, i.e., those bytes may contain any random values
at program start.

To make sure that those bytes are initialized to zero at program start,
use the following code:

Code:

WinDir: times   MAX_PATH        db      0

YONG

14 May 2005, 07:52

Cthulhu

Joined: 12 May 2005
Posts: 29

Cthulhu 14 May 2005, 13:16

Thank you YONG!

14 May 2005, 13:16

Matrix

Joined: 04 Sep 2004
Posts: 1164
Location: Overflow

Matrix 25 Jun 2005, 05:01

Hy,
newbies, pls read the FASM documentation , Design Principles, or Why fasm Is Different and the faqs:

25 Jun 2005, 05:01

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