oh come on, in a new patch the address of the opcode changes...
all it takes is for any proc above it to be altered...i would be very very surprised if the va of the opcode you're talking about is consistant from v1 -> 1.05 (or even higher)

well, of course. I was talking about unaltered exe file. But i was wondering if some game programmer leave on purpose codes caves and altered they own opcodes or scaning some strategic part of they own code for alterations to make cheating harder? I saw something like that in monster garage (the kind of game that i paid 10$ at the pharmacy). It is like the game is detecting any change in is opcode within 2 sec and quit to windows. Frustrating i say.

probably just a crc check, its relatively hard in a high level language to force code cave generation in the code (especially if you have the compiler optimisation flags) so i'd say its pretty rare

unaltered exe file? well how would it be a patch/upgrade?

change in opcode can be one of 2 possibilities

1. crc used
2. actual opcodes are used as a crypt/decrypt key

you just need to investigate it further, remember that its very rare for this sort of stuff to be put in at compile time, rather its done after compile, via binary patching / external tools and so on, so at one point in time the code was 'clean', thus, if the stuff is removed properly, the code should run fine.

Hey, you know what i was talking about... you pulling my leg here u naughty boy.:p Making fun of a poor french guys how have a hard time to make himself clear sometime.

Of course if change the excecutable, big chance are that the opcode wont be the same.

sometime my bigest difficulty sometime making trainers is to find some value actually (mostly lifebar). so if someone are better than me to do that and could give the opcode who write's in it, that cool with me.

heh

well if you've found the value and the location then you simply kick in a debugger and bpm the area, and find the code that does the alteration,
could be an add dword ptr [blah] or an mov dword ptr [blah], some register
etc, bpming is the next step.. so you're 1/2 way there already

Going through the code and all is easier now for me once i have the value. When the need will be there, then i will move to more advanced stuff. The asm tuts here a good though. I printed it and put it beside my toilet seat and my bed so i read bits here and there.

Finding the value still the harder think to do like lifebar mostly (not the ghost value one's). Bah. I just need to find some advanced tuts about hard to find values and advance methodes :) . I learn more when i learn by myself.

Sometime i found that tsearch for example can find some value that other can't and but the oposite is true so i have a couple of search engine just in case and then i use cheat engine mostly to do the debuging stuff.

The ASM tuts are only the basic opcodes, you have more sophisticated ones and harder to learn. But usually when training games you will hardly have the need to use them, BUT, they do make guest appearances.

So perhaps learn up on REP ops, like REPE (repeat if equal), REPZ (repeat if zero) and so on.

Others like SBB, PUNPCKLWD, PXOR, LAHF, CDQ etc

and floating point x87 too basically any opcode that adjusts a register and / or a memory address you need to learn and understand totally

i degraded my CNC3 to 1.04 for the trainers lol

ORLY?
How do you do that then? :eek:

Reinstalled no doubt.

And ORLY? isnt really funny anymore just to let you know :P

dunno about that. Still stads up compared to some of the shit people get away with. ;)

Then maybe i should start writing some small stuff in asm. any idea of a free good asm compiler that support 32 and 16 bits reg? That way, someone can get use with asm stuff.

i used to write some routine (mainly for ems, mouse and grfx) within my C programs. Nothing big.

YAY ;D

http://masm32.com/

And a very nice IDE for MASM:
http://www.winasm.net/

If I'm not mistaken an ASM compiler is called an assembler, just to let you know ;)

thanx. i had an old masm and tasm myself but i does only 16 regs.