Locals and parameters.

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booter

Joined: 08 Dec 2006
Posts: 67

booter 03 May 2009, 09:17

I'm rather confused with proc parameters and locals.
Why can't I use them the same way as "outside" variables?

Code:

StdOutHdl   dd 0  ; handle
 ...
macro TstTst
{stdcall Test,handle}
 ...
proc Test hdl:DWORD
  invoke  WriteFile,[StdOutHdl], ...   ; OK
  invoke  WriteFile,hdl, ... ; compile error (why?)
  invoke  WriteFile,addr hdl, ... ; doesn't work 
  invoke  WriteFile,[hdl], ... ; doesn't work 
endp

I found some (ugly) solution, but why would I need this?

Code:

  mov     ebx,[hdl]
  mov     ebx,[ebx]
  invoke  WriteFile,ebx, ... ; works

03 May 2009, 09:17

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 19876
Location: In your JS exploiting you and your system

revolution 03 May 2009, 09:52

Works for me:

Code:

include 'win32ax.inc'

proc start hd1:DWORD
  invoke  WriteFile,[hd1]
     invoke  WriteFile,addr hd1
endp

macro A param,[arg] {nop}

macro B [arg]{
  common
  A xyz,arg
}

B 1,2,3,4

.end start

03 May 2009, 09:52

Neutrino

Joined: 18 Dec 2008
Posts: 2

Neutrino 04 May 2009, 08:22

To get variable value you should use brackets:

Code:

  macro TstTst   {stdcall Test,[handle]}

and:

Code:

  invoke  WriteFile,[hdl], ...

04 May 2009, 08:22

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