Cheat Engine

deama1234 · Posted: Thu Jan 22, 2015 11:08 am Post subject: GetAsyncKeyState Problem...

Well, here's my code, when I enable it and press "C" on my keyboard it doesn't do anything; what did I do wrong?

Geri · Moderator Reputation: 111 Joined: 05 Feb 2010 Posts: 5636

You can't just call a function whenever you want. The easiest way is usually to change a conditional jump to enable/disable the execution of a certain code (eg that you never get hit or never die).

If you want to make a script that will be executed only once, it's better if you are using flags. Setting the flag to 1 will execute the code and set the flag to 0, until the user will set the flag to 1 again. Look at Recifense's scripts to see how is he using flags. Pretty much all of his scripts are using 0/1 flags.

deama1234 · Posted: Thu Jan 22, 2015 11:50 am Post subject:

I see, makes sense...

Ok, another question; how do I find the "jump" opcode set? The bit that says ' '? Cause the jump is mapped to "space", so I was wondering if I can find that bit and just make it call my code everytime I jump.

Geri · Moderator Reputation: 111 Joined: 05 Feb 2010 Posts: 5636

The reason of why you can't call and execute a random code anytime is the environment. The registers will be different, the stack will be different, etc.

What you want to do is to change your space ship into a bicycle at the speed of light. The environment is not suitable. In order to do it, you have to change the whole environment.

deama1234 · Posted: Thu Jan 22, 2015 3:51 pm Post subject:

Alright, so, how do I search for keypresses? Do I just search for a 1 byte value for whether the player has pressed it or not? Or is there an easier way?

Geri · Moderator Reputation: 111 Joined: 05 Feb 2010 Posts: 5636

It isn't guaranteed that you will find a flag like that. Eg with the API that you have used, the result is not stored anywhere, just temporarily on eax. Scanning will not find anything in that case.

But for jump, you can often find a flag which is related to the jump. Eg a flag which is 0 when you are not jumping and 1 if you are jumping. If there is double jump, it's even better, as there is probably a value to store how many times did you jump (eg 0 on ground, 1 after jump, 2 after double jump). This can help you to find functions related to jumping.

A better solution would be to store the address of the exp and add it to the cheat table, then assign a hotkey to it to increase the value with x amount when you press the defined hotkey.

deama1234 · Posted: Thu Jan 22, 2015 8:21 pm Post subject:

Geri · Moderator Reputation: 111 Joined: 05 Feb 2010 Posts: 5636

It's as I have said above. If you call a function just like that, it will not work, because you call it from a wrong environment.

When I have mentioned conditional jumps, that has absolutely nothing to do with jumping in the game. Conditional jumps are certain instructions which will decide that the code execution will jump or not when certain conditions are met. They are "branches" in the otherwise linearly executed code. Google conditional jumps for more info (it's a long topic).

Your game is crashing, because you are doing something at the wrong location. That function is just part of a big machine, it's not working on it's own and if you put that part in the wrong place, it will cause malfunction.