CODEWITHSUNDEEP
vb.netmemory
FraserOfSmeg
FraserOfSmeg

Reputation: 1148

How to lock WriteProcessMemory so that values stay constant

I've successfully implemented the WriteProcessMemory function in vb.net (WOOP!). However when I try and change a value it sometimes is automatically changed back to it's previous value. I'd like a way to lock and unlock these values if possible.

Here's the code the changes the values:

  _memManager.TryAttachToProcess("SomeAPP")

    Dim bytes() As Byte = _memManager.ReadBytes(xpos(0), 4)

    Dim currentx As Double = BitConverter.ToSingle(bytes, 0)

    Dim targetx As Double = currentx + 2
    bytes = BitConverter.GetBytes(targetx)
    For i = 0 To xpos.GetLength(0) - 1

        _memManager.WriteBytes(xpos(i), bytes.Length, bytes)

    Next

    _memManager.DetachFromProcess()

    RichTextBox1.AppendText("compleate" & Chr(13))

Any help/advice or links would be great!

Upvotes: 1

Views: 238

Answers (1)

Jens
Jens

Reputation: 6375

I believe what those "gamehack" - programs usually do is just changing the values on a timer. Say the memory value gets set to the new values every 100ms or so. The program you are trying to target may have anti-temper mechanics in it that uses for example multiple variables for 1 value. it can't reset to the previous value if that value isn't stored somewhere else, maybe you should find this location and change the value there as well. I don't believe you can really permanently lock write-access to part of some other programs memory, but i may be wrong there. I guess the target would just instantly crash with a memory corruption error.

Upvotes: 2

Related Questions