[C#] Process Memory Reading Class

[Chad]

Last year or two years ago I had looked into Process Memory Reading in order to inject values into games that where downloaded and playing to make a bot (ie; Runescape, WoW, LoL, 12Sky, etc etc) and I never fully grasped how to predict where or what the new value address would be when the program starts up as it's nearly different every time and a pain in the ass to find. However this class does all that its supposed to.

 using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
 
namespace ProcessMemoryReaderLib
{
    /// <summary>
    /// ProcessMemoryReader is a class that enables direct reading a process memory
    /// </summary>
    class ProcessMemoryReaderApi
    {
        // constants information can be found in <winnt.h>
        [Flags]
        public enum ProcessAccessType
        {
            PROCESS_TERMINATE            = (0x0001),
            PROCESS_CREATE_THREAD        = (0x0002), 
            PROCESS_SET_SESSIONID        = (0x0004), 
            PROCESS_VM_OPERATION        = (0x0008), 
            PROCESS_VM_READ                = (0x0010), 
            PROCESS_VM_WRITE            = (0x0020), 
            PROCESS_DUP_HANDLE            = (0x0040), 
            PROCESS_CREATE_PROCESS        = (0x0080), 
            PROCESS_SET_QUOTA            = (0x0100), 
            PROCESS_SET_INFORMATION        = (0x0200), 
            PROCESS_QUERY_INFORMATION    = (0x0400) 
        }
        
        // function declarations are found in the MSDN and in <winbase.h> 
        
        //        HANDLE OpenProcess(
        //            DWORD dwDesiredAccess,  // access flag
        //            BOOL bInheritHandle,    // handle inheritance option
        //            DWORD dwProcessId       // process identifier
        //            );
        [DllImport("kernel32.dll")]
        public static extern IntPtr OpenProcess(UInt32 dwDesiredAccess, Int32 bInheritHandle, UInt32 dwProcessId);
 
        //        BOOL CloseHandle(
        //            HANDLE hObject   // handle to object
        //            );
        [DllImport("kernel32.dll")]
        public static extern Int32 CloseHandle(IntPtr hObject);
 
        //        BOOL ReadProcessMemory(
        //            HANDLE hProcess,              // handle to the process
        //            LPCVOID lpBaseAddress,        // base of memory area
        //            LPVOID lpBuffer,              // data buffer
        //            SIZE_T nSize,                 // number of bytes to read
        //            SIZE_T * lpNumberOfBytesRead  // number of bytes read
        //            );
        [DllImport("kernel32.dll")]
        public static extern Int32 ReadProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress,[In, Out] byte[] buffer, UInt32 size, out IntPtr lpNumberOfBytesRead);
    
        //        BOOL WriteProcessMemory(
        //            HANDLE hProcess,                // handle to process
        //            LPVOID lpBaseAddress,           // base of memory area
        //            LPCVOID lpBuffer,               // data buffer
        //            SIZE_T nSize,                   // count of bytes to write
        //            SIZE_T * lpNumberOfBytesWritten // count of bytes written
        //            );
        [DllImport("kernel32.dll")]
        public static extern Int32 WriteProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress,[In, Out] byte[] buffer, UInt32 size, out IntPtr lpNumberOfBytesWritten);
    
        
    }
 
    public class ProcessMemoryReader
    {
 
        public ProcessMemoryReader()
        {
        }
 
        /// <summary>    
        /// Process from which to read        
        /// </summary>
        public Process ReadProcess
        {
            get
            {
                return m_ReadProcess;
            }
            set
            {
                m_ReadProcess = value;
            }
        }
 
        private Process m_ReadProcess = null;
 
        private IntPtr m_hProcess = IntPtr.Zero;
 
        public void OpenProcess()
        {
//            m_hProcess = ProcessMemoryReaderApi.OpenProcess(ProcessMemoryReaderApi.PROCESS_VM_READ, 1, (uint)m_ReadProcess.Id);
            ProcessMemoryReaderApi.ProcessAccessType access;
            access = ProcessMemoryReaderApi.ProcessAccessType.PROCESS_VM_READ 
                | ProcessMemoryReaderApi.ProcessAccessType.PROCESS_VM_WRITE 
                | ProcessMemoryReaderApi.ProcessAccessType.PROCESS_VM_OPERATION;
                m_hProcess = ProcessMemoryReaderApi.OpenProcess((uint)access, 1, (uint)m_ReadProcess.Id);
        }
 
        public void CloseHandle()
        {
            int iRetValue;
            iRetValue = ProcessMemoryReaderApi.CloseHandle(m_hProcess);
            if (iRetValue == 0)
                throw new Exception("CloseHandle failed");
        }
 
        public byte[] ReadProcessMemory(IntPtr MemoryAddress, uint bytesToRead, out int bytesRead)
        {
            byte[] buffer = new byte[bytesToRead];
            
            IntPtr ptrBytesRead;
            ProcessMemoryReaderApi.ReadProcessMemory(m_hProcess,MemoryAddress,buffer ,bytesToRead,out ptrBytesRead);
            
            bytesRead = ptrBytesRead.ToInt32();
 
            return buffer;
        }
 
        public void WriteProcessMemory(IntPtr MemoryAddress, byte[] bytesToWrite ,out int bytesWritten)
        {
            IntPtr ptrBytesWritten;
            ProcessMemoryReaderApi.WriteProcessMemory(m_hProcess,MemoryAddress,bytesToWrite,(uint)bytesToWrite.Length,out ptrBytesWritten);
            
            bytesWritten = ptrBytesWritten.ToInt32();
        }
 
        
 
 
    }
} 
  

Disclaimer: I had followed a tutorial in writing this class so not all or any of the code is mine.