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vyrrt
How do I cheat?
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Joined: 11 Aug 2013
Posts: 4
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 Posted: Thu Aug 15, 2013 3:50 pm Post subject: C# ReadProcessMemory |
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Hi guys,
I am trying to access an address of a game and after 3 days of Googling and still hitting a brick wall I have decided to ask for help. From what I understand, I need to use ReadProcessMemory in order to get the base address.
My MemoryApi class is as follows:
| Code: | class MemoryApi
{
[Flags]
public enum ProcessAccessFlags : uint
{
All = 0x001F0FFF,
Terminate = 0x00000001,
CreateThread = 0x00000002,
VMOperation = 0x00000008,
VMRead = 0x00000010,
VMWrite = 0x00000020,
DupHandle = 0x00000040,
SetInformation = 0x00000200,
QueryInformation = 0x00000400,
Synchronize = 0x00100000
}
[DllImport("kernel32.dll")]
private static extern IntPtr OpenProcess(ProcessAccessFlags dwDesiredAccess, [MarshalAs(UnmanagedType.Bool)] bool bInheritHandle, int dwProcessId);
[DllImport("kernel32.dll", SetLastError = true)]
private static extern bool WriteProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress, byte[] lpBuffer, uint nSize, out int lpNumberOfBytesWritten);
[DllImport("kernel32.dll", SetLastError = true)]
static extern bool ReadProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress, [Out] byte[] lpBuffer, int dwSize, out int lpNumberOfBytesRead);
[DllImport("kernel32.dll")]
public static extern Int32 CloseHandle(IntPtr hProcess);
public static byte[] ReadMemory(Process process, int address, int numOfBytes, out int bytesRead)
{
var hProc = OpenProcess(ProcessAccessFlags.All, false, process.Id);
var buffer = new byte[numOfBytes];
ReadProcessMemory(hProc, new IntPtr(address), buffer, numOfBytes, out bytesRead);
return buffer;
}
} |
This is an example of the code that calls this method:
| Code: | class CurrentGameTime
{
public static GameTime GetCurrentGameTime()
{
var gameTime = new GameTime();
var gameProcess = BaseProcess.GetGameProcess();
int bytesRead;
byte[] test = MemoryApi.ReadMemory(gamrProcess, 0x193D0F4, 4, out bytesRead);
//TODO: Use result to instantiate gameTime
return gameTime;
}
} |
Whenever this runs, the byte array that is returned is 4 bytes in size with a value of 0. I am genuinely stuck and would appreciate any advice.
Incase it is needed, here is the code from my BaseProcess class:
| Code: | public class BaseProcess
{
public static Process GetGameProcess()
{
try
{
var processes = Process.GetProcessesByName("GameProcessName");
if (processes.Length > 0)
{
return processes[0];
}
throw new Exception("Client was not found.");
}
catch
{
return null;
}
}
} |
Thanks
Vyrrt
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TsTg
Master Cheater
 Reputation: 5
Joined: 12 Dec 2012
Posts: 340
Location: Somewhere....
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| Posted: Thu Aug 15, 2013 4:14 pm Post subject: |
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Use the pointer to the buffer instead:
| Code: | | ReadProcessMemory(hProc, new IntPtr(address), &buffer, numOfBytes, out bytesRead); |
also make sure the read process went ok (check if ReadProcessMemory returns 0 if failed)
or in your ReadMemory function, return the address of the array instead
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vyrrt
How do I cheat?
![]() Reputation: 0
Joined: 11 Aug 2013
Posts: 4
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| Posted: Fri Aug 16, 2013 12:35 am Post subject: |
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| Would that not require me to use unsafe?
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Dark Byte
Site Admin
 Reputation: 471
Joined: 09 May 2003
Posts: 25823
Location: The netherlands
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| Posted: Fri Aug 16, 2013 3:30 am Post subject: |
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You are reading the wrong address. It's modulebase+0x193D0F4, not 0x193D0F4,
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vyrrt
How do I cheat?
![]() Reputation: 0
Joined: 11 Aug 2013
Posts: 4
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| Posted: Fri Aug 16, 2013 1:07 pm Post subject: |
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Ah damn, that was it!
Many thanks.
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atom0s
Moderator
 Reputation: 205
Joined: 25 Jan 2006
Posts: 8587
Location: 127.0.0.1
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| Posted: Sat Aug 17, 2013 1:16 pm Post subject: |
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| vyrrt wrote: | | Would that not require me to use unsafe? |
Unsafe will only help you inside your own memory space (or if you are injected). Also there is basically never a reason to use unsafe in C# when everything you can do with it can be done with the Marshal class.
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