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How to read double at memory address?

 
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Morbod
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PostPosted: Wed Dec 13, 2017 4:30 am    Post subject: How to read double at memory address? Reply with quote

Hi. I have two questions actually. The first one is, if I have a pointer that points to a double value, how do I properly read this value?
I found a few examples on the net, but none of it works, one of the things being something like this:

Code:

UINT32* pAddress = 0x200000;
double* pValue = (double*)pAddress;
double value = *pValue;


- which just end up crashing. I know the value is there though, as Cheat Engine can read it when I click on the address in the memory viewer.

The second question is, if I have a pointer like this:
Code:

UINT32* pAddress = new UINT32(0x200000);


And I did this:
Code:

UINT32* pAddress2 = (UINT32*)pAddress[8];


Would pAddress2 then point to an offset of 8 from pAddress, or what does it mean? I just saw this in an example on the internet and wasn't sure what exactly it meant.

Thanks!
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Dark Byte
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PostPosted: Wed Dec 13, 2017 5:20 am    Post subject: Reply with quote

Are you sure the the address is there and you're not just following a pointer? (nr1 mistake when people follow pointers from CE is that they just calculate base with offsets by just adding them)

this code should work:
Code:

double value = *(*double)0x200000;


when you test the code, do you run it in your own process or in the target process, because if your own, then that may be why it crashes

---

as for your second question:
Code:

UINT32* pAddress = new UINT32(0x200000);


why new ? What language is this ?

anyhow,
Code:

UINT32* pAddress2 = (UINT32*)pAddress[8];

will read the value at pAddress[8] (that's 0x200020) and store it as a pointer to pAddress2
Not quite sure what that would accomplish

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Morbod
How do I cheat?
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Joined: 17 Jun 2017
Posts: 2

PostPosted: Wed Dec 13, 2017 6:01 am    Post subject: Reply with quote

Thanks for your reply. As for the second question, it seems like it was used to access different properties within a structure in a game, so I guess that's a way to do it.

Code:

double value = *(*double)0x200000;


I suppose you meant "(double*)" here, so after not before, right? The other one wouldn't compile anyway. However, this still doesn't seem to work for whatever reason.
And yes the code is in a DLL which I inject into the target process when testing it. I logged the address that the DLL uses, and when I go to that address in the memory viewer, it does in fact give me the correct double value, but when my DLL tries getting it, it still crashes.
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