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Using the registersymbol/unregistersymbol functions

 
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Dark Byte
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Location: The netherlands

PostPosted: Wed Dec 07, 2005 10:39 pm    Post subject: Using the registersymbol/unregistersymbol functions Reply with quote

I am assuming you have read the info about auto assembler scripts in cheat tables: http://forum.cheatengine.org/viewtopic.php?t=4868

Let's continue with explaining the use of registersymbol and unregistersymbol.

When you have registered a symbol by either manually inputting it in the userdefined symbollist in the memory view, or by registering it by auto assemble script, you can then use it as if it is a normal address.

So, if you allocate some memory, and store a address there using the script, you can then easily access it by it's name.

Let's take a look at the auto assembler script of the pinball tutorial, and change it slightly:
Code:

[ENABLE]
//code from here to '[DISABLE]' will be used to enable the cheat
registersymbol(pointertoballs) //add "pointertoballs" to the userdefined symbollist

alloc(newmem,2048) //2kb should be enough
alloc(pointertoballs,4)


label(returnhere)
label(originalcode)
label(exit)

Pinball.exe+175b7:
jmp newmem
nop
returnhere:

newmem: //this is allocated memory, you have read,write,execute access
//place your code here
mov [pointertoballs],esi //store the base address to pointertoballs

originalcode:
mov [esi+00000146],eax

exit:
jmp returnhere
 
 
[DISABLE]
//code from here till the end of the code will be used to disable the cheat
unregistersymbol(pointertoballs)
dealloc(newmem)
dealloc(pointertoballs)

Pinball.exe+175b7:
mov [esi+00000146],eax


as you see, I allocated 4 extra bytes to store the register value of esi in, and registered that address, and deallocate that memory in the disable part, and unregister it (so it becomes useless after disabling it)

I could have used:
Code:

push eax
lea eax,[esi+146]
mov [pointertoballs],eax
pop eax

to store the exact address, but let's keep it easy for people with only a little assembler knowledge


One downside is of course that after enabling the script, the address doesn't immeadiatly hold the right value, but only after it has been executed. So keep that in mind.

Another thing is that addresses that use the symbolname pointertoballs only get updated after a few seconds, so the first few seconds it may be pointing at a old address. One way to get by this is rightclick and choose "force recheck symbols"

anyhow, when the script has been executed you can use it for all sorts of usefull things, like a base pointer...



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supea
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Joined: 29 Aug 2006
Posts: 323
Location: Finland

PostPosted: Tue Nov 14, 2006 8:11 am    Post subject: Reply with quote

i understand like half but nice i think ...
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weirdokidxx
How do I cheat?
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Joined: 29 Jan 2008
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PostPosted: Wed Apr 16, 2008 9:46 am    Post subject: Reply with quote

Thx!! now i know how!! ty ty ty ty ty ty tty ty ty t yyyy!!!
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Chase Payne
Grandmaster Cheater
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Joined: 20 Mar 2008
Posts: 533

PostPosted: Sat Apr 19, 2008 12:22 am    Post subject: Reply with quote

what does
Code:
lea
do?
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elradur
How do I cheat?
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Joined: 17 Jan 2007
Posts: 1

PostPosted: Tue Jul 29, 2008 3:23 am    Post subject: RE: What does LEA do? Reply with quote

Hello Folks, this is my first post Smile

Cause I'm a little lazy I just post a definition / description of LEA

LEA - Load Effective Address
8D / r LEA r16,m Store effective address for m in register r16
8D / r LEA r32,m Store effective address for m in register r32

Description
Computes the effective address of the second operand (the source operand) and stores it in the first operand (destination operand). The source operand is a memory address (offset part) specified with one of the processors addressing modes; the destination operand is a general-purpose register. The address-size and operand-size attributes affect the action performed by this instruction, as shown in the following table. The operand-size attribute of the instruction is determined by the chosen register; the address-size attribute is determined by the attribute of the codesegment.
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