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Stuck on tutorial 9

 
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chez
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Joined: 02 Jun 2020
Posts: 33
PostPosted: Wed Jun 24, 2020 4:52 pm    Post subject: Stuck on tutorial 9 Reply with quote
I've watched many tutorials on how to do this, but I still can't manage to get my script to work.

Code:
The script as follows:
label(code)
label(return)
label(compare)
label(player)

compare:
  cmp [ebx+0C],1   //1 is the value that differs from player and pc
  je player
  jmp code
player:
  sub [ebx+04],0
  jmp return
code:
  mov [ebx+04],eax
  fldz
  jmp return

INJECT:
  jmp newmem
return:
registersymbol(INJECT)


anything I'm doing wrong here?
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happyTugs
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Joined: 23 Apr 2020
Posts: 26
PostPosted: Wed Jun 24, 2020 9:11 pm    Post subject: Reply with quote
Are you sure you used the right compare? I think you forgot to de-reference each address before dissecting structs, hence you got offset C.

As such, I believe offset 10 is the correct choice for the compare.

Code:
...
  cmp [ebx+10],1   
  je player
  jmp code
...


Moroever, the below code will throw an exception since you forgot to add fldz.

Code:
...
player:
  sub [ebx+04],0
  jmp return
code:
...


A way to remedy that is through this.

Code:
...
player:
  fldz -- add this since it was part of the original code (it's also important in this context) 
  jmp return
code:
...

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