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logging values at breakpoints..

 
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Caliber
Expert Cheater
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Joined: 20 Aug 2007
Posts: 102
PostPosted: Wed Jul 31, 2013 9:19 am    Post subject: logging values at breakpoints.. Reply with quote
haven't used cheatengine to do these things before so I thought I would inquire:

in the case of the code here:

005B1202 - 8B 91 88040000 - mov edx,[ecx+00000488]

is it possible for cheatengine to log values?

for instance

log EDX

or log [ECX+0x488]

etc..


or log [ECX+00488] only if [EBX+40] == 0x70

thanks in advance if you have info on this..

best,
Cal
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Dark Byte
Site Admin
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Joined: 09 May 2003
Posts: 25804
Location: The netherlands
PostPosted: Wed Jul 31, 2013 11:26 am    Post subject: Reply with quote
Well, you could use the conditional breakpoint method. After setting the breakpoint set an complex conditonal breakpoint with this code:
Code:

  if readInteger(EBX+0x40)==0x70 then
    print(readInteger(ECX+0x448))
  end
  return false  --never break, just log



Or you can use a predefined onBreakpoint function
E.g if you execute this lua script before setting the breakpoint it will log it from the start
Code:

function debugger_onBreakpoint()
  if (EIP==0x005B1202) then
    if readInteger(EBX+0x40)==0x70 then
      print(readInteger(ECX+0x448))
    end
    return 1 --continue and do not update the gui
  else
    --something else
    return 0 --let the user know about this
  end
end


If you wish to log to a file or something else, then replace print with a function that does that for you.
Also, all registers are defined in the global context of lua, so you don't have to pass on all the registers to subfunctions you may call
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