Reading or Writing to Another Processes Memory in C# z

http://www.jarloo.com/reading-and-writing-to-memory/

 

Declarations

[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);

Reading from another processes Memory

public static byte[] ReadMemory(Process process, int address, int numOfBytes, out int bytesRead)
{
    IntPtr hProc = OpenProcess(ProcessAccessFlags.All, false, process.Id);
 
    byte[] buffer = new byte[numOfBytes];
 
    ReadProcessMemory(hProc, new IntPtr(address), buffer, numOfBytes, out bytesRead);
    return buffer;
}

Here is an example of a call to this function:

Process process = Process.GetProcessesByName("My Apps Name").FirstOrDefault();           
int address = 0x02ED2910;
 
int bytesRead;
byte[] value = ReadMemory(process, address, 4, out bytesRead);

Writing to another processes memory

public static bool WriteMemory(Process process, int address, long value, out int bytesWritten)
{
    IntPtr hProc = OpenProcess(ProcessAccessFlags.All, false, process.Id);
             
    byte[] val = BitConverter.GetBytes(value);
             
    bool worked = WriteProcessMemory(hProc, new IntPtr(address), val, (UInt32) val.LongLength, out bytesWritten);
 
    CloseHandle(hProc);
 
    return worked;
}

Here is an example of a call to this function:

Process process = Process.GetProcessesByName( "My Apps Name" ).FirstOrDefault();
int address = 0x02ED2910;

int bytesWritten;
bool worked = WriteMemory(process, address, value, out bytesWritten);

Readprocessmemory用法

函数功能：该函数从指定的进程中读入内存信息，被读取的区域必须具有访问权限。

 

函数原型：BOOL ReadProcessMemory(HANDLE hProcess,LPCVOID lpBaseAddress,LPVOID lpBuffer,DWORD nSize,LPDWORD lpNumberOfBytesRead)；

 

参数：

hProcess：进程句柄

 

lpBaseAddress：读出数据的地址

 

lpBuffer：存放读取数据的地址

 

nSize：读出的数据大小

 

lpNumberOfBytesRead：数据的实际大小

 

C#中使用该函数首先导入命名空间：

 

using System.Runtime.InteropServices;

using System.Runtime.InteropServices;

 

 

然后写API引用部分的代码，放入 class 内部

 

[DllImport("kernel32.dll ")]
static extern bool ReadProcessMemory(int hProcess, int lpBaseAddress,out int lpBuffer, int nSize, out int lpNumberOfBytesRead);

[DllImport("kernel32.dll ")] static extern bool ReadProcessMemory(int hProcess, int lpBaseAddress,out int lpBuffer, int nSize, out int lpNumberOfBytesRead);

 

这个函数有五个参数，第一个参数是 进程句柄，由OpenProcess函数获取；第二个参数是要读出数据的地址，使用CE等辅助工具可取得；第三个参数是用于存放读取数据的地址；第四个参数是 要读出的数据大小；第五个参数是读出数据的实际大小。例如：

IntPtr hwnd = FindWindow(null, "计算器");
const int PROCESS_ALL_ACCESS = 0x1F0FFF;
const int PROCESS_VM_READ = 0x0010;
const int PROCESS_VM_WRITE = 0x0020;
if (hwnd != IntPtr.Zero)
{
    int calcID;
    int calcProcess;
    int dataAddress;
    int readByte;
    GetWindowThreadProcessId(hwnd, out calcID);
    calcProcess = OpenProcess(PROCESS_VM_READ | PROCESS_VM_WRITE, false, calcID);
    //假设地址0X0047C9D4存在信息
    ReadProcessMemory(calcProcess, 0X0047C9D4, out dataAddress, 4, out readByte);
    MessageBox.Show(dataAddress.ToString());
}
else
{
    MessageBox.Show("没有找到窗口");
}

IntPtr hwnd = FindWindow(null, "计算器"); const int PROCESS_ALL_ACCESS = 0x1F0FFF; const int PROCESS_VM_READ = 0x0010; const int PROCESS_VM_WRITE = 0x0020; if (hwnd != IntPtr.Zero) { int calcID; int calcProcess; int dataAddress; int readByte; GetWindowThreadProcessId(hwnd, out calcID); calcProcess = OpenProcess(PROCESS_VM_READ | PROCESS_VM_WRITE, false, calcID); //假设地址0X0047C9D4存在信息 ReadProcessMemory(calcProcess, 0X0047C9D4, out dataAddress, 4, out readByte); MessageBox.Show(dataAddress.ToString()); } else { MessageBox.Show("没有找到窗口"); }

如果我们读取的一段内存中的数据，我们引入部分可修改成如下：

//二维数组
[DllImport("kernel32.dll ")]
static extern bool ReadProcessMemory(int hProcess, int lpBaseAddress, byte[,] lpBuffer, int nSize, out int lpNumberOfBytesRead);
//一维数组
[DllImport("kernel32.dll ")]
static extern bool ReadProcessMemory(int hProcess, int lpBaseAddress, byte[] lpBuffer, int nSize, out int lpNumberOfBytesRead);

//二维数组 [DllImport("kernel32.dll ")] static extern bool ReadProcessMemory(int hProcess, int lpBaseAddress, byte[,] lpBuffer, int nSize, out int lpNumberOfBytesRead); //一维数组 [DllImport("kernel32.dll ")] static extern bool ReadProcessMemory(int hProcess, int lpBaseAddress, byte[] lpBuffer, int nSize, out int lpNumberOfBytesRead);

由于数组是引用传递，我们不需要写out关键字。