Struc array

Index > Main > Struc array

Author

Thread

Jin X

Joined: 06 Mar 2004
Posts: 104
Location: Russia

Jin X

Hello!

1. How can I define array of uninitialized structures?

Code:

struc POINT
{
  .x dd ?
  .y dd ?
}

Points POINT 10 dup (?)  ; error!!!

And then use mov eax,[Points.y+edx*8]

2. Can I define structure without label name?

Code:

POINT ; error

Last edited by Jin X on 17 Aug 2018, 13:25; edited 1 time in total

17 Aug 2018, 13:20

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 18472
Location: In your JS exploiting you and your system

revolution

1. Your POINT structure doesn't define its size so it will be tricky, but it can be done like this:

Code:

Points POINT ; the first POINT structure
rept 9 {
 local .dummy_label
 .dummy_label POINT
}

2. Macros and Strucs are the same thing except that struc requires a label name. If you want to place structures without a label then you can define a macro of the same name. Macros and Strucs are kept in separate places so you can define both in same code with the same name.

17 Aug 2018, 13:25

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 18472
Location: In your JS exploiting you and your system

revolution

Jin X wrote:

And then use mov eax,[Points.y+edx*8]

Ideally you would define the size of the structure so that changes will be applied to any code that uses it.

Code:

mov eax,[Points.y+edx*sizeof.POINT]

Last edited by revolution on 17 Aug 2018, 16:46; edited 1 time in total

17 Aug 2018, 13:28

Jin X

Joined: 06 Mar 2004
Posts: 104
Location: Russia

Jin X

How can I access some scturture field relative to some address. Something like:

Code:

mov eax,[edx+POINT.y]  ; mov eax,[edx+4]

???

17 Aug 2018, 15:10

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 18472
Location: In your JS exploiting you and your system

revolution

Jin X wrote:

How can I access some scturture field relative to some address. Something like:
Code:
mov eax,[edx+POINT.y]  ; mov eax,[edx+4]    
???

You have to define POINT.y as a label

Code:

struc POINT {
y dd ?
}
POINT POINT ;define POINT.y label

17 Aug 2018, 16:08

Jin X

Joined: 06 Mar 2004
Posts: 104
Location: Russia

Jin X

Something like this? Smile

Else I will get addressing relative to POINT (label definition) offset.

Code:

virtual at 0
  POINT POINT
end virtual

17 Aug 2018, 16:42

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 18472
Location: In your JS exploiting you and your system

revolution

Yes, if you don't need the memory allocated, and only want the label values.

17 Aug 2018, 16:45

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum