Added most hooks except xfer logic and winform/wpf versions.

NTwain/TwainSessionWPF.cs

@@ -0,0 +1,48 @@
+using NTwain.Data;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Permissions;
+using System.Text;
+using System.Windows.Forms;
+using System.Windows.Interop;
+
+namespace NTwain
+{
+    /// <summary>
+    /// A customized TWAIN session for use in WPF environment.
+    /// Use this by using <see cref="PreFilterMessage"/> method as the target of <see cref="HwndSource.AddHook"/> delegate.
+    /// </summary>
+    public class TwainSessionWPF : TwainSessionBase
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="TwainSessionWPF" /> class.
+        /// </summary>
+        /// <param name="appId">The app id.</param>
+        /// <exception cref="System.ArgumentNullException"></exception>
+        public TwainSessionWPF(TWIdentity appId) : base(appId) { }
+
+        /// <summary>
+        /// Message loop processor for WPF.
+        /// </summary>
+        /// <param name="hwnd">The window handle.</param>
+        /// <param name="msg">The message ID.</param>
+        /// <param name="wParam">The message's wParam value.</param>
+        /// <param name="lParam">The message's lParam value.</param>
+        /// <param name="handled">A value that indicates whether the message was handled. Set the value to true if the message was handled; otherwise, false.</param>
+        /// <returns></returns>
+        [EnvironmentPermissionAttribute(SecurityAction.LinkDemand)]
+        public IntPtr PreFilterMessage(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
+        {
+            MSG winmsg = default(MSG);
+            winmsg.hwnd = hwnd;
+            winmsg.lParam = lParam;
+            winmsg.message = msg;
+            winmsg.wParam = wParam;
+
+            handled = base.HandleWndProcMessage(ref winmsg);
+
+            return IntPtr.Zero;
+        }
+    }
+}