pointer to structure

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HarryTuttle

Joined: 26 Sep 2003
Posts: 211
Location: Poland

HarryTuttle 23 Jan 2004, 16:45

when I create the structure like:

Code:


do_nothing struc{

lazy_men_counter dd ?
lazy_woma_counter dd ?
}

I can get :

Code:

.data
room do_nothing
.code
mov eax,[room.lazy_men_counte]

now eax hold the number of men who do nothing

i C the code may looks like this:

Code:

int a =room.lazy_men_counter;

when I want to point the system memory I could not create any structure but just to get the pointer and point the place.

Code:

do_nothing * room;
room=getSystemOperation(); //not real function just set the pointer called 'room'
int a=room->lazy_men_counter;

How it could be done in ASM Question

THX
harry

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23 Jan 2004, 16:45

roticv

Joined: 19 Jun 2003
Posts: 374
Location: Singapore

roticv 23 Jan 2004, 16:50

Code:

        virtual at eax ;assuming that eax contains the pointer to the structure
        .nothing   do_nothing
        end     virtual
        mov     eax,[.nothing.lazy_men_counter ]

If I am not wrong.

23 Jan 2004, 16:50

decard

Joined: 11 Sep 2003
Posts: 1092
Location: Poland

decard 23 Jan 2004, 17:03

You can use struct macro from struct.inc file (from both Fasm and Fresh packages):

Code:

do_nothing struc{ 

lazy_men_counter dd ? 
lazy_woma_counter dd ? 
}
struct do_nothing          ; <----------

and now you can write:

Code:

mov ebx,[eax+do_nothing.lazy_man_counter]

(assuming that eax contains pointer to your structure)

regards

23 Jan 2004, 17:03

fasm9

Joined: 19 Jun 2003
Posts: 439

fasm9 23 Jan 2004, 22:36

Hi, still i considering a compiler written in FASM, but,

C#(vs.net, mono) produce il assembly,
if (let me say this again, if) FASM understand il assembly, life is much easier.

--

23 Jan 2004, 22:36

HarryTuttle

Joined: 26 Sep 2003
Posts: 211
Location: Poland

HarryTuttle 25 Jan 2004, 00:10

Decard! Fantastyczne, dzięki za pomoc!

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Microsoft: brings power of yesterday to computers of today.

25 Jan 2004, 00:10

BiDark

Joined: 22 Jun 2003
Posts: 109
Location: .th

BiDark 25 Jan 2004, 03:35

roticv wrote:

Code:

        virtual at eax ;assuming that eax contains the pointer to the structure
        .nothing   do_nothing
        end     virtual
        mov     eax,[.nothing.lazy_men_counter ]

If I am not wrong.

May be this?

Code:

  virtual at eax
    eax.do_nothing do_nothing
  end virtual

So you can access like this:

Code:

  mov eax,[eax.do_nothing.members]

25 Jan 2004, 03:35

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