VB.NET Signature:

<DllImport("kernel32.dll", SetLastError:=True)> _
    Public Shared Function WriteProcessMemory(
    ByVal hProcess As IntPtr,
    ByVal lpBaseAddress As IntPtr,
    ByVal lpBuffer As Byte(),
    ByVal nSize As Int32,
    <Out()> ByRef lpNumberOfBytesWritten As IntPtr) As Boolean
    End Function

C# Signature:

[DllImport("kernel32.dll", SetLastError = true)]
  public static extern bool WriteProcessMemory(
  IntPtr hProcess,
  IntPtr lpBaseAddress,
  byte[] lpBuffer,
  Int32 nSize,
  out IntPtr lpNumberOfBytesWritten);

[DllImport("kernel32.dll", SetLastError = true)]
  public static extern bool WriteProcessMemory(
  IntPtr hProcess,
  IntPtr lpBaseAddress,
  [MarshalAs(UnmanagedType.AsAny)] object lpBuffer,
  int dwSize,
  out IntPtr lpNumberOfBytesWritten);

C# Generic Usage Snippet: (Also added RPM-> ReadProcessMemory example)

public bool Wpm<T>(IntPtr lpBaseAddress, T value) where T : struct
    {
        var buffer = new T[Marshal.SizeOf<T>()];
        buffer[0] = value;
        return WriteProcessMemory(_gameProcess.Process.Handle, lpBaseAddress, buffer, Marshal.SizeOf<T>(), out var bytesread);
    }

public bool Wpm<T>(IntPtr lpBaseAddress, T value, List<int> offsets) where T : struct
    {
        IntPtr address = lpBaseAddress;

        var lastOffset = offsets.Last();
        offsets.RemoveAt(offsets.Count - 1);

        foreach (var offset in offsets)
        {
        address = Rpm<IntPtr>(IntPtr.Add(address, offset));
        }

        return Wpm<T>(IntPtr.Add(address, lastOffset), value);
    }

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).