something about 'strcall'

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iklin

Joined: 20 Mar 2004
Posts: 120
Location: Russia, Siberia

iklin 20 Mar 2004, 17:43

Greetings to all from Siberia!

First, sorry for my not so good English...
Second, I'm a beginner not only in fasm but in assembly at all.
I'm maker-up and poetry editor.

Third, I could overlook something but in fasm I can't find
'sizeof' or such. And this plunge me into deep despair.
But after reading about 50% of threads I think I found
a solution for my trouble.

Problem: if I wanna display some string only 1 time, but wan't
to declare them and wan't to call 'lstrlen' or 'wsprintf', e.g.

Code:

invoke WriteFile, [hout], 'abracadabra', ???, written

Such coding makes trouble to 'step over' debugging but not for
'step into'. And beginners may use this way of coding
'till they get more experience. And there is one more thing
which I want from fasm - listing. I'm lost all of symbols with
disassemblers (like 'hiew') or debugger (like 'ollydbg').
I need listing after all of macro parsing passes and before
assembling - with it I could fall deeper in assembler.

Solution: some kind of 'invoke'

Code:

macro sinvoke proc, [arg] { 
reverse 
  if arg eq 
  else if arg eqtype ''
    local .@string
    call .@string
    label raw byte
    db arg,0
    .size = $-raw-1
    .@string:
  else       
    pushd arg 
  end if    
common 
  call [proc]    
}

...used like...

Code:

sinvoke WriteFile, [hout], 'abracadabra', .size, written

It works! But...

Code:

sinvoke WriteFile, [hout], <'abracadabra',10,13>, .size, written

...alas

Question: can somebody explain me what happens, what's wrong?

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O, tempora! O, mores!

20 Mar 2004, 17:43

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 21 Mar 2004, 09:29

what happens is that
<'abracadabra',10,13> eqtype ''
isn't true condition, thus it isn't assembled as string

21 Mar 2004, 09:29

iklin

Joined: 20 Mar 2004
Posts: 120
Location: Russia, Siberia

iklin 21 Mar 2004, 10:55

Thanx, vid!
I play around the macro above and was confused with another bad thing. 'sinvoke' can be placed only one time. If there are more 'sinvoke''s - it fails. Well, I decide that this ability isn't so important for me and just forget it. I'm always can declare such string Smile

21 Mar 2004, 10:55

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8359
Location: Kraków, Poland

Tomasz Grysztar 21 Mar 2004, 11:08

To make it usable more than once, put the following lines at the beginning of macro:

Code:

common
 local ..sz,..str,..raw
 .size equ ..sz
 .@string equ ..str
 raw equ ..raw

21 Mar 2004, 11:08

iklin

Joined: 20 Mar 2004
Posts: 120
Location: Russia, Siberia

iklin 24 Mar 2004, 18:42

Thanks a lot, Privalov!
I couldn't do it by my hands 'cos fasm manual isn't clear for me yet... in some places... But now I'm trying to translate it into Russian to dive into fasm deeper.
I wrote simple and dirty dos16 disasm using nasm for training. Now I think to write simple asm using fasm, just to let me know how it works.
I need only free time...

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24 Mar 2004, 18:42

S.T.A.S.

Joined: 09 Jan 2004
Posts: 173
Location: Ru#27

S.T.A.S. 25 Mar 2004, 06:44

[offtop]
iklin,
you might want to take a look at this short FASM tutorial by pas and here for IceStudent's .chm

25 Mar 2004, 06:44

iklin

Joined: 20 Mar 2004
Posts: 120
Location: Russia, Siberia

iklin 26 Mar 2004, 16:07

Thanx, S.T.A.S. I saw it. It's not bad, but can't cover all of things I want.

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O, tempora! O, mores!

26 Mar 2004, 16:07

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