Cheat Engine

Screitor · Last edited by Screitor on Sat Feb 23, 2013 12:45 am; edited 1 time in total

Hi there, I need to set a breakpoint in some address within a external process.

It's just to change the value of EAX, but I don't know how to set a breakpoint, is there some Windows API to do that or something?

Any help would be appreciated.

Screitor · Posted: Sat Feb 23, 2013 12:25 am Post subject:

*bump*

Is that so easy?

C'mon, if CE can do it, I think I also could, the problem is that I don't know where to start.

Dark Byte · Posted: Sat Feb 23, 2013 4:34 am Post subject:

First write something to capture debug exceptions. That can be by attaching the windows debugger to the game or registering an exception handler, or hooking into the unhandled exception handler function, or interrupt hooks, etc...

Now, set the debug registers(Dr0-4 and dr7 to control it) or a software breakpoint (0xcc: int 3) at the specific spot and wait for an exception to trigger and that it is a single step exception(DRx), or a breakpoint (int 3)

Then do your stuff and to continue:
If debug registers and vista+:
Set the RF flag in the eflags register and just continue

If you are on XP or using int3:
Set the TF flag, remove the breakpoint, do a single step, set the breakpoint back and resume

Screitor · Posted: Sat Feb 23, 2013 1:36 pm Post subject:

Thanks a ton, I'll try it.