ASM Community

Yo all. I'm new in fasm so... please help me about some macro functions :>
1) How can macros return something like in masm -> EXITM ... ?
2) How can I create Struct with functions like in the c++ classes?
3) How can I make a macro like: MSGBOX('text', x, MB_OK) like in the hll?
4) How can I write in other sections with a macro:
(MASM:)
.data ; <~
wText db "bla bla bla",0
.code ; <~
-- --------------------------------------------------------
please help me I really need theese things
btw sorry about my bad english :)

hi,

Have you read the fasm doc, it has alot of examples and stuff. Might help you, its a great file. if you still have some questions then ask away.

to create a structure you do

struc somestruc

{

.something dd ?

.something2 dd ?

}

i how to make structures, but i need structures with functions in them - like in C++ classes

How to make a macro who returns a value and require brackets?
Something like MsgBox(param1,param2,param3)?
Could someone tell me please... i need this :(

What exactly do you mean by "returns a value"?
The assembly macro syntax doesn't use the brackets, it could be possible with some extended macro syntax I had been thinking of some time ago, but I haven't found to be really necessary (at least there wasn't large interest in it) at that's why I have never started implementing it.

Maybe something like the hll syntax:
;----
if msgbox('some','text',mb_yesno) == idyes
;----
I need something like in masm - 'exitm arg', but i didn't find nothing at the fasm manual... please tell me how to do this in fasm

p.s. sorry about my stupid posts but i'm new in fasm :)

It's not like the EXITM, be you need to test the value returned at run time, not at assembly time. Win32 API functions are returning the values in EAX register, so you'd just need to test the value of this register.
If you want to do it with some similar one-line syntax, you can do it using the following macro as a extension to the standard .if macros package (it's in FASMW distribution, in INCLUDE/MACRO/IF.INC file):

macro .iff func,c,num

{

  __IF equ

  local ..endif

  __ENDIF equ ..endif

  local ..else

  __ELSE equ ..else

  func

  if num eq & c eq

   cmp eax,0

   je __ELSE

  else

   cmp eax,num

   jn#c __ELSE

  end if

}

It allows to use some function instead of register or memory operand for comparision.
Here's the example how you can use it:

macro MsgBox message,caption,flags

 {

  pushd flags

  call @f

  db caption,0

  @@:

  call @f

  db message,0

  @@:

  pushd 0

  call [MessageBox]

 }



.iff <MsgBox "Some message","Some caption",MB_YESNO>,e,IDYES

  MsgBox "You have answered YES!","Some caption",MB_OK

.endif

Tanx, this works really fine but how can I edit the .IF macro to do this? I want it just like in the hll languages
:)

Why?

Anyway you can merge these two syntaxes into one .if directive using the eqtype directive:

macro .if func,c,num

{

  __IF equ

  local ..endif

  __ENDIF equ ..endif

  local ..else

  __ELSE equ ..else

  if func eqtype eax | func eqtype [0]

   if num eq & c eq

    cmp func,0

    je __ELSE

   else

    cmp func,num

    jn#c __ELSE

   end if

  else

   func

   if num eq & c eq

    cmp eax,0

    je __ELSE

   else

    cmp eax,num

    jn#c __ELSE

   end if

  end if

}

This is just the thing I needed :grin: thank you Privalov. :alright:
P.S Can you add the Switch (case) macro in the next version of Fasm it's good to have hll functions in a low level language :)

I would prefer to implement it as select/case (as in powerbasic) like this:

macro .select arg
{
__SELECT equ arg
__CASE equ _
local ..endselect
__ENDSELECT equ ..endselect
}

macro .case c,i
{
if ~ __CASE eq _
jmp __ENDSELECT
__CASE:
end if
local ..case
restore __CASE
__CASE equ ..case
cmp __SELECT,i
jn#c __CASE
}

macro .otherwise
{
if ~ __CASE eq _
jmp __ENDSELECT
__CASE:
restore __CASE
__CASE equ _
end if
}

macro .endselect
{
if ~ __CASE eq _
__CASE:
end if
__ENDSELECT:
restore __ENDSELECT
restore __CASE
restore __SELECT
}

and use them like this:

mov eax,
.select eax
.case e,WM_DESTROY
invoke PostQuitMessage,0
xor eax,eax
.otherwise
invoke DefWindowProc,,,,
.endselect

what do think guys? :)

Happy coding

If this macro works it will be perfect for my project :)

Those brackets you were talking about (and were planing to implement) would be very interesting... Is it to much to ask for (do you have too much to do?)?

Thanks for a great tool!