Cheat Engine

[Thiago]

What's wrong with my code:

[Dark Byte]

WriteProcessMemory(hProcess, (LPVOID)JNPAddr, &jnp, 2, NULL);

[Thiago]

It stops from crashing, but the opcode is not being written, I've checked the addresses and stuff but nothing yet.

[Dark Byte]

you're sure the original code isn't 7b 22 ? (because if writing fails then it should also have failed on that 3 bytes)

anyhow, try using virtualprotectex to make the memory writable first

[Thiago]

This is the original instructions, without messing with it.

After writting the code to give permissions it works, but only jumps one instruction away from the jmp, causing the program to crash.

I think it's because it's vanishing the opcode " 22 " instead of just modifying the " 7B " to a " EB ".

[Zanzer]

That shows the address is the dynamic address: main.exe+4DD8C
Your code is using the static address: 0x0044DDB0
Open Cheat Engine and go to address 0044DDB0 in memory view
That's where you're writing

[Thiago]

[Zanzer]

There is still a huge difference between those addresses.
Go read up on dynamic vs static.
In memory viewer, go to address 0044DD8C.
It's not the same place as in your screenshot.

[Stylo]

Why are you writing 3 bytes from the buffer when there's actually 2 bytes?
and if I'm correct, the buffer argument you pass is the address of the local variable of the buffer instead the address of the buffer itself
shouldn't it be

[Thiago]

[Zanzer]

That's because strings are null terminated by a 0x00, and it's therefore three characters.

[Thiago]

I see it, I finally found the error, I was missing one number in the address, just so it wrote to the wrong address, and it crashed the game, but now I got everything working properly.

Thanks for helping everyone.