ReadProcessMemory() doesn't works with long address like 0x2840C6C68D8

Question

I am trying to read values from a game with ReadProcessMemory() but it seems like i can only use that with short addresses. I was successful reading values with exact same code but a game that has shorter addresses. Like this 0x5CD38994 However when i try to do same thing with a different game that has longer addresses like 0x2840C6C68D8 i just get 0. I think it's about ReadProcessMemory() What should i do?

ReadProcessMemory(pHandle,(LPVOID)0x2840C6C68D8, &my_value, sizeof(my_value),0);

Entire Code:
#include <iostream>
#include <Windows.h>
#include <string>
#include <cstdint>

DWORD pid;
int my_value;

int main(){

    HWND hWnd = FindWindowA(0, ("game"));

    GetWindowThreadProcessId(hWnd, &pid);
    std::cout << pid << std::endl;
    HANDLE pHandle = OpenProcess(PROCESS_VM_READ, FALSE, pid);
    while(1){
        ReadProcessMemory(pHandle, (LPVOID)0x2840C6C68D8, &my_value, sizeof(my_value),0);
        std::cout << my_value << std::endl;
    }
}

This post should help you: https://stackoverflow.com/questions/39690525/readprocessmemory-with-int64-address — Dennis Kozevnikoff, Jul 09 '20 at 17:38
Are you compiling this code for 32bit or 64bit? `0x2840C6C68D8` is not valid to use if compiling in 32bit, as it will exceed the size of a 32bit `void*` pointer, but `0x5CD38994` will not. If you want to access data in a remote 64bit process, your code should be compiled for 64bit as well. — Remy Lebeau, Jul 09 '20 at 20:59
@Lebeau my machine is 64bit. But i don't know if i am compiling it for 32bit or 64bit. How can i learn that and how to compile it for 64bit. — Okilata, Jul 09 '20 at 21:29

score 1 · Answer 1 · answered Jul 20 '20 at 21:16

1

You must compile for x64 by using `gcc -m64', otherwise you cannot use ReadProcessMemory() to read 64bit addresses.

answered Jul 20 '20 at 21:16

GuidedHacking

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ReadProcessMemory() doesn't works with long address like 0x2840C6C68D8

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