can't get with locals

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pr0x

Joined: 31 Jan 2006
Posts: 2

pr0x 31 Jan 2006, 10:09

I have some proc, like thisone:

Code:

proc    gwd
locals
        szdir   rd      100h
endl
        lea             edx,[szdir]
        stdcall [GetSystemDirectory],edx,100h
        invoke  MessageBox,0,edx,edx,0 ;

        ret

endp

So I need it to show me path to systemdir. How can I do this?
if szdir is in .data segment, then all works fune (in MessageBox edx should be changed to szdir), but using locals..endl I can't. Please help.[/code]

31 Jan 2006, 10:09

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 31 Jan 2006, 10:28

get OllyDbg (OllyDebug), and trace into procedure... debugging skill is as important as coding skill.

31 Jan 2006, 10:28

chris

Joined: 05 Jan 2006
Posts: 62
Location: China->US->China->?

chris 31 Jan 2006, 10:33

you can not expect that GetSystemDirectory preserve edx.
and the rule of fasm is that symbols outside square brackets are labels(addresses). so you may try:

Code:

proc    gwd 
locals 
        szdir   rd      100h 
endl 
        lea             edx,[szdir] 
        stdcall [GetSystemDirectory],edx,100h

        lea             edx,[szdir] 
        invoke  MessageBox,0,edx,edx,0 ; 

        ret 

endp

And actually there is a macro 'addr' in win32ax.inc that you could use in this case.

31 Jan 2006, 10:33

pr0x

Joined: 31 Jan 2006
Posts: 2

pr0x 31 Jan 2006, 11:19

Thank's for advice!

31 Jan 2006, 11:19

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