diff -r 000000000000 -r f6eca6facd07 CbtHook.cs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CbtHook.cs	Sat Jun 14 12:51:25 2014 +0200
@@ -0,0 +1,171 @@
+//=============================================================================
+// COPYRIGHT: Prosoft-Lanz
+//=============================================================================
+//
+// $Workfile: CbtHook.cs $
+//
+// PROJECT : CodeProject Components
+// VERSION : 1.00
+// CREATION : 19.02.2003
+// AUTHOR : JCL
+//
+// DETAILS : This class implement the WH_CBT Windows hook mechanism.
+//           From MSDN, Dino Esposito.
+//           WindowCreate, WindowDestroy and WindowActivate user events.
+//
+//-----------------------------------------------------------------------------
+using System;
+using System.Text;
+using System.Runtime.InteropServices;
+
+namespace CodeProject.Win32API.Hook
+{
+	///////////////////////////////////////////////////////////////////////
+	#region Enum CbtHookAction
+
+	/// <summary>
+	/// CBT hook actions.
+	/// </summary>
+	internal enum CbtHookAction : int
+	{
+		HCBT_MOVESIZE = 0,
+		HCBT_MINMAX = 1,
+		HCBT_QS = 2,
+		HCBT_CREATEWND = 3,
+		HCBT_DESTROYWND = 4,
+		HCBT_ACTIVATE = 5,
+		HCBT_CLICKSKIPPED = 6,
+		HCBT_KEYSKIPPED = 7,
+		HCBT_SYSCOMMAND = 8,
+		HCBT_SETFOCUS = 9
+	}
+
+	#endregion
+
+	///////////////////////////////////////////////////////////////////////
+	#region Class CbtEventArgs
+
+	/// <summary>
+	/// Class used for WH_CBT hook event arguments.
+	/// </summary>
+	public class CbtEventArgs : EventArgs
+	{
+		/// wParam parameter.
+		public IntPtr wParam;
+		/// lParam parameter.
+		public IntPtr lParam;
+		/// Window class name.
+		public string className;
+		/// True if it is a dialog window.
+		public bool IsDialog;
+
+		internal CbtEventArgs(IntPtr wParam, IntPtr lParam)
+		{
+			// cache the parameters
+			this.wParam = wParam;
+			this.lParam = lParam;
+
+			// cache the window's class name
+			StringBuilder sb = new StringBuilder();
+			sb.Capacity = 256;
+			USER32.GetClassName(wParam, sb, 256);
+			className = sb.ToString();
+			IsDialog = (className == "#32770");
+		}
+	}
+
+	#endregion
+
+	///////////////////////////////////////////////////////////////////////
+	#region Class CbtHook
+	
+	/// <summary>
+	/// Class to expose the windows WH_CBT hook mechanism.
+	/// </summary>
+	public class CbtHook : WindowsHook
+	{
+		/// <summary>
+		/// WH_CBT hook delegate method.
+		/// </summary>
+		public delegate void CbtEventHandler(object sender, CbtEventArgs e);
+
+		/// <summary>
+		/// WH_CBT create event.
+		/// </summary>
+		public event CbtEventHandler WindowCreate;
+		/// <summary>
+		/// WH_CBT destroy event.
+		/// </summary>
+		public event CbtEventHandler WindowDestroye;
+		/// <summary>
+		/// WH_CBT activate event.
+		/// </summary>
+		public event CbtEventHandler WindowActivate;
+
+		/// <summary>
+		/// Construct a WH_CBT hook.
+		/// </summary>
+		public CbtHook() : base(HookType.WH_CBT)
+		{
+			this.HookInvoke += new HookEventHandler(CbtHookInvoked);
+		}
+		/// <summary>
+		/// Construct a WH_CBT hook giving a hook filter delegate method.
+		/// </summary>
+		/// <param name="func">Hook filter event.</param>
+		public CbtHook(HookProc func) : base(HookType.WH_CBT, func)
+		{
+			this.HookInvoke += new HookEventHandler(CbtHookInvoked);
+		}
+
+		// handles the hook event
+		private void CbtHookInvoked(object sender, HookEventArgs e)
+		{
+			// handle hook events (only a few of available actions)
+			switch ((CbtHookAction)e.code)
+			{
+				case CbtHookAction.HCBT_CREATEWND:
+					HandleCreateWndEvent(e.wParam, e.lParam);
+					break;
+				case CbtHookAction.HCBT_DESTROYWND:
+					HandleDestroyWndEvent(e.wParam, e.lParam);
+					break;
+				case CbtHookAction.HCBT_ACTIVATE:
+					HandleActivateEvent(e.wParam, e.lParam);
+					break;
+			}
+			return;
+		}
+
+		// handle the CREATEWND hook event
+		private void HandleCreateWndEvent(IntPtr wParam, IntPtr lParam)
+		{
+			if (WindowCreate != null)
+			{
+				CbtEventArgs e = new CbtEventArgs(wParam, lParam);
+				WindowCreate(this, e);
+			}
+		}
+
+		// handle the DESTROYWND hook event
+		private void HandleDestroyWndEvent(IntPtr wParam, IntPtr lParam)
+		{
+			if (WindowDestroye != null)
+			{
+				CbtEventArgs e = new CbtEventArgs(wParam, lParam);
+				WindowDestroye(this, e);
+			}
+		}
+
+		// handle the ACTIVATE hook event
+		private void HandleActivateEvent(IntPtr wParam, IntPtr lParam)
+		{
+			if (WindowActivate != null)
+			{
+				CbtEventArgs e = new CbtEventArgs(wParam, lParam);
+				WindowActivate(this, e);
+			}
+		}
+	}
+	#endregion
+}