C# keystroke interceptor when minimized

Question

Ok, so I am trying to write a program that will track my keystrokes while playing a game so that I can analyze the data later to help me improve my game. What I have been trying to do was implement a Global Hotkey Hook using user32.dll's RegisterHotKey. but this captures the keystroke completely, and the game no longer receives the keystroke. I don't know where to go from here and any pointers would be much appreciated. Here is some additional info:

• I am using C#
• .NET 4
• Using Visual Studio 2010
• I am NOT trying to do anything illegal, or against a game TOS

Answer 1

This is taken from Stephan Toubs blog back from 2006:

http://blogs.msdn.com/b/toub/archive/2006/05/03/589423.aspx

using System.Diagnostics;
using System.Windows.Forms;
using System.Runtime.InteropServices;

class InterceptKeys
{
   private const int WH_KEYBOARD_LL = 13;
   private const int WM_KEYDOWN = 0x0100;
   private static LowLevelKeyboardProc _proc = HookCallback;
   private static IntPtr _hookID = IntPtr.Zero;

   public static void Main()
   {
       _hookID = SetHook(_proc);
       Application.Run();
       UnhookWindowsHookEx(_hookID);
   }

   private static IntPtr SetHook(LowLevelKeyboardProc proc)
   {
       using (Process curProcess = Process.GetCurrentProcess())
       using (ProcessModule curModule = curProcess.MainModule)
       {
        return SetWindowsHookEx(WH_KEYBOARD_LL, proc,
            GetModuleHandle(curModule.ModuleName), 0);
       }
    }

    private delegate IntPtr LowLevelKeyboardProc(
    int nCode, IntPtr wParam, IntPtr lParam);

    private static IntPtr HookCallback(
    int nCode, IntPtr wParam, IntPtr lParam)
   {
       if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
       {
           int vkCode = Marshal.ReadInt32(lParam);
           Console.WriteLine((Keys)vkCode);
       }

       return CallNextHookEx(_hookID, nCode, wParam, lParam);
}

   [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
   private static extern IntPtr SetWindowsHookEx(int idHook,
   LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

   [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
   [return: MarshalAs(UnmanagedType.Bool)]
   private static extern bool  UnhookWindowsHookEx(IntPtr hhk);

   [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
   private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode,
    IntPtr wParam, IntPtr lParam);

   [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
   private static extern IntPtr GetModuleHandle(string lpModuleName);
}