| Re: Function Hooking [message #490118 is a reply to message #490117] |
Wed, 24 December 2014 17:41   |
Neijwiert
Messages: 124
Registered: October 2009
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| jonwil wrote on Wed, 24 December 2014 14:42 |
If you want to hook Commands->Find_Object, just read the address out of that variable (the "original" Find_Object) then replace it with the address of your new function.
Your new funxtion would then call the stock function through the pointer you saved ealier.
p
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That would result in an infinite loop? For example:
typedef GameObject *(** FindObjectPointer)(int);
FindObjectPointer OriginalFindObject;
GameObject *Find_Object_Test(int obj_id)
{
Console_Output("Finding object with id: %d\n", obj_id);
return (* OriginalFindObject)(obj_id);
}
TimeMachine::TimeMachine()
{
OriginalFindObject = &Commands->Find_Object;
*&Commands->Find_Object = &Find_Object_Test;
}
The OriginalFindObject would point right back to the hooked one. Im trying to catch all calls to the original method and then do some stuff. I'm just using Find_Object as an example, the actual command I'm going to target is Start_Timer.
When I compile and run this I get an infinite loop.
NOTE: I'm also trying to catch calls to the method outside of my DLL. So there's no other way than memory hooking it with a jump? Or am I just thinking to difficult right now?
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