diff -r 19c1aaf900dc -r 7acec5059fa6 Server/WindowsHook.cs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Server/WindowsHook.cs	Tue Aug 12 20:55:50 2014 +0200
@@ -0,0 +1,186 @@
+//=============================================================================
+// COPYRIGHT: Prosoft-Lanz
+//=============================================================================
+//
+// $Workfile: WindowsHook.cs $
+//
+// PROJECT : CodeProject Components
+// VERSION : 1.00
+// CREATION : 19.02.2003
+// AUTHOR : JCL
+//
+// DETAILS : This class implement the Windows hook mechanism.
+//           From MSDN, Dino Esposito.
+//
+//-----------------------------------------------------------------------------
+using System;
+using System.Runtime.InteropServices;
+
+namespace CodeProject.Win32API.Hook
+{
+	///////////////////////////////////////////////////////////////////////
+	#region Class HookEventArgs
+
+	/// Class used for hook event arguments.
+	public class HookEventArgs : EventArgs
+	{
+		/// Event code parameter.
+		public int code;
+		/// wParam parameter.
+		public IntPtr wParam;
+		/// lParam parameter.
+		public IntPtr lParam;
+
+		internal HookEventArgs(int code, IntPtr wParam, IntPtr lParam)
+		{
+			this.code = code;
+			this.wParam = wParam;
+			this.lParam = lParam;
+		}
+	}
+	
+	#endregion
+
+	///////////////////////////////////////////////////////////////////////
+	#region Enum HookType
+
+	/// Hook Types.
+	public enum HookType : int
+	{
+		/// <value>0</value>
+		WH_JOURNALRECORD = 0,
+		/// <value>1</value>
+		WH_JOURNALPLAYBACK = 1,
+		/// <value>2</value>
+		WH_KEYBOARD = 2,
+		/// <value>3</value>
+		WH_GETMESSAGE = 3,
+		/// <value>4</value>
+		WH_CALLWNDPROC = 4,
+		/// <value>5</value>
+		WH_CBT = 5,
+		/// <value>6</value>
+		WH_SYSMSGFILTER = 6,
+		/// <value>7</value>
+		WH_MOUSE = 7,
+		/// <value>8</value>
+		WH_HARDWARE = 8,
+		/// <value>9</value>
+		WH_DEBUG = 9,
+		/// <value>10</value>
+		WH_SHELL = 10,
+		/// <value>11</value>
+		WH_FOREGROUNDIDLE = 11,
+		/// <value>12</value>
+		WH_CALLWNDPROCRET = 12,		
+		/// <value>13</value>
+		WH_KEYBOARD_LL = 13,
+		/// <value>14</value>
+		WH_MOUSE_LL = 14
+	}
+	#endregion
+
+	///////////////////////////////////////////////////////////////////////
+	#region Class WindowsHook
+
+	/// <summary>
+	/// Class to expose the windows hook mechanism.
+	/// </summary>
+	public class WindowsHook
+	{
+		/// <summary>
+		/// Hook delegate method.
+		/// </summary>
+		public delegate int HookProc(int code, IntPtr wParam, IntPtr lParam);
+
+		// internal properties
+		internal IntPtr hHook = IntPtr.Zero;
+		internal HookProc filterFunc = null;
+		internal HookType hookType;
+
+		/// <summary>
+		/// Hook delegate method.
+		/// </summary>
+		public delegate void HookEventHandler(object sender, HookEventArgs e);
+
+		/// <summary>
+		/// Hook invoke event.
+		/// </summary>
+		public event HookEventHandler HookInvoke;
+
+		internal void OnHookInvoke(HookEventArgs e)
+		{
+			if (HookInvoke != null)
+				HookInvoke(this, e);
+		}
+
+		/// <summary>
+		/// Construct a HookType hook.
+		/// </summary>
+		/// <param name="hook">Hook type.</param>
+		public WindowsHook(HookType hook)
+		{
+			hookType = hook;
+			filterFunc = new HookProc(this.CoreHookProc);
+		}
+		/// <summary>
+		/// Construct a HookType hook giving a hook filter delegate method.
+		/// </summary>
+		/// <param name="hook">Hook type</param>
+		/// <param name="func">Hook filter event.</param>
+		public WindowsHook(HookType hook, HookProc func)
+		{
+			hookType = hook;
+			filterFunc = func; 
+		}
+
+		// default hook filter function
+		internal int CoreHookProc(int code, IntPtr wParam, IntPtr lParam)
+		{
+			if (code < 0)
+				return CallNextHookEx(hHook, code, wParam, lParam);
+
+			// let clients determine what to do
+			HookEventArgs e = new HookEventArgs(code, wParam, lParam);
+			OnHookInvoke(e);
+
+			// yield to the next hook in the chain
+			return CallNextHookEx(hHook, code, wParam, lParam);
+		}
+
+		/// <summary>
+		/// Install the hook. 
+		/// </summary>
+		public void Install()
+		{
+			hHook = SetWindowsHookEx(hookType, filterFunc, IntPtr.Zero, (int)AppDomain.GetCurrentThreadId());
+		}
+
+		
+		/// <summary>
+		/// Uninstall the hook.
+		/// </summary>
+ 		public void Uninstall()
+		{
+			if (hHook != IntPtr.Zero)
+			{
+				UnhookWindowsHookEx(hHook);
+				hHook = IntPtr.Zero;
+			}
+		}
+
+		#region Win32 Imports
+
+		[DllImport("user32.dll")]
+		internal static extern IntPtr SetWindowsHookEx(HookType code, HookProc func, IntPtr hInstance, int threadID);
+
+		[DllImport("user32.dll")]
+		internal static extern int UnhookWindowsHookEx(IntPtr hhook); 
+
+		[DllImport("user32.dll")]
+		internal static extern int CallNextHookEx(IntPtr hhook, int code, IntPtr wParam, IntPtr lParam);
+
+		#endregion
+	}
+	#endregion
+}