Cheat Engine

[qoazi]

So yes, i have a memory scanner that to my knowledge is acting rather strangely, It reads memory, And skips unallocated memory, up to a Point
after a certain Point it suddenly tries to read a section of unallocated memory, Throwing an Access Violation exception.
If i try handling this exception then i'll notice that pretty much every single unallocated memoryspace after the first one is read too, and the code after a while suddenly returns a seemingly random adress somewhere in unallocated memoryspace.

I know for a fact that what i'm searching has an extremely minimal chance of existing in the program, And it should in theory therefore Always scan all the memory and return 0, Something it does not when the exception is handled.

To show some of this in action: (Not handling the exception on this one, I'd rather make sure it never happens) EDIT: I Put the link in my Signature, As i'm apparently unable to post links (I couldn't find the rules D: And didn't see anything about posting links in the FAQ?)

Any thoughts?

[Dark Byte]

Welcome to injected memory scanning.
It's a hell.

During the scan, after virtualQueryEx, but before the scan is finished, a thread of the game can free the memoryblock you're currently scanning.
(Another issue with injected scanners is that sometimes you're scanning your own allocated memory where you add the results, which you will find again, which you'll add, and again, ....)

You could add some exception handling around every page you're going to read, and if an exception happens, do virtualquery again and start from the next available page

[qoazi]

Yea, That's Pretty much what i tried earlier, added it again and compiled and retried, Result in the second video in my signature

These is what i mentioned in my first post, When handling the exception i instead get wierd seemingly random return values of addresses pointing to unallocated memoryspace.

Considering this memoryspace is unallocated it should had been skipped, But it wasn't

Considering it is unallocated (again) it should have thrown an exception when read, But it didn't!

Considering it doesn't exist at all the comparisons should be wrong! But instead they all match up and return the adress?!

I can't wrap my head around it!

can the try/Catch statement somehow cause a return that exits the function? (and returns an adress :7 )

[qoazi]