How to WriteProcessMemory with multipointers

Question

First of all, what I am trying to do is changing a value in the memory of a game. In order to write to that variable I need to add the following pointer and offsets because then I always get to an address that works:

baseAddr + offset1 + offset2 + offset3 = myDesiredAddr

Now, this is what I have tried to do...

ReadProcessMemory(
hProc, (LPVOID)(BaseAddr + offset1), &myDesiredAddr, sizeof(myDesiredAddr), 0
);
ReadProcessMemory(
hProc, (LPVOID)(myDesiredAddr + offset2), &myDesiredAddr, sizeof(myDesiredAddr), 0
);
ReadProcessMemory(
hProc, (LPVOID)(myDesiredAddr + offset3), &myDesiredAddr, sizeof(myDesiredAddr), 0
);

I've tired to WriteProcessMemory on the final address that I got but it does not read and write successfully. Any advice will be helpful.

Answer 1

You could do something like this:

unsigned long offset1 =  /* your value              */
unsigned long offset2 =  /* your value              */
unsigned long offset3 =  /* your value              */
unsigned long BaseAddr = /* your value              */
unsigned long Pointer;   /* to hold the final value */
unsigned long temp;      /* hold the temp values    */
unsigned value =         /* value to write          */

The above shows your declarations. I presume you check if the read and write functions return successfully, otherwise I would suggest you do so.

ReadProcessMemory(
hProc, reinterpret_cast<LPVOID>(BaseAddr), &temp, sizeof(temp), 0);
Pointer = temp + offset1;

ReadProcessMemory(
hProc, reinterpret_cast<LPVOID>(Pointer), &temp, sizeof(temp), 0);
Pointer = temp + offset2;

ReadProcessMemory(
hProc, reinterpret_cast<LPVOID>(Pointer), &temp, sizeof(temp), 0);
Pointer = temp + offset3;

/* Now Pointer stores the final address and *
 * you can write to it                      */
WriteProcessMemory(
hProc, reinterpret_cast<unsigned*>(Pointer), &value, sizeof(value), 0);

By adding the memory addresses and offsets and storing the value in Pointer, you can continue to read from Pointer and store the temporary addresses in a temp variable until you get to the final address that you want.

I suggest you do this in a loop for efficiency and neater code.