Hid some more triplets.

NTwain/ITwainSession.cs

@@ -96,5 +96,12 @@ namespace NTwain
         /// <param name="session">The session.</param>
         /// <returns></returns>
         TWStatus GetStatus();
+
+        /// <summary>
+        /// Gets the manager status. Only call this at state 3 or higher.
+        /// </summary>
+        /// <param name="session">The session.</param>
+        /// <returns></returns>
+        TWStatusUtf8 GetStatusUtf8();
     }
 }

NTwain/Triplets/DGControl/DGControl.DeviceEvent.cs

@@ -6,10 +6,10 @@ namespace NTwain.Triplets
     /// <summary>
     /// Represents <see cref="DataArgumentType.DeviceEvent"/>.
     /// </summary>
-	public sealed class DeviceEvent : OpBase
+	sealed class DeviceEvent : OpBase
 	{
 		internal DeviceEvent(ITwainSessionInternal session) : base(session) { }
-        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1021:AvoidOutParameters", MessageId = "0#")]
+    
         public ReturnCode Get(out TWDeviceEvent sourceDeviceEvent)
 		{
 			Session.VerifyState(4, 7, DataGroups.Control, DataArgumentType.DeviceEvent, Message.Get);

NTwain/Triplets/DGControl/DGControl.StatusUtf8.cs

@@ -6,7 +6,7 @@ namespace NTwain.Triplets
     /// <summary>
     /// Represents <see cref="DataArgumentType.StatusUtf8"/>.
     /// </summary>
-	public sealed class StatusUtf8 : OpBase
+	sealed class StatusUtf8 : OpBase
 	{
 		internal StatusUtf8(ITwainSessionInternal session) : base(session) { }
 
@@ -16,8 +16,9 @@ namespace NTwain.Triplets
         /// </summary>
         /// <param name="status">The status.</param>
         /// <returns></returns>
-        public ReturnCode GetManager(TWStatusUtf8 status)
+        public ReturnCode GetManager(out TWStatusUtf8 status)
         {
+            status = new TWStatusUtf8();
             Session.VerifyState(3, 7, DataGroups.Control, DataArgumentType.StatusUtf8, Message.Get);
             return Dsm.DsmEntry(Session.AppId, null, Message.Get, status);
         }
@@ -28,8 +29,9 @@ namespace NTwain.Triplets
 		/// </summary>
 		/// <param name="status">The status.</param>
 		/// <returns></returns>
-		public ReturnCode GetSource(TWStatusUtf8 status)
+		public ReturnCode GetSource(out TWStatusUtf8 status)
 		{
+            status = new TWStatusUtf8();
 			Session.VerifyState(3, 7, DataGroups.Control, DataArgumentType.StatusUtf8, Message.Get);
 			return Dsm.DsmEntry(Session.AppId, Session.CurrentSource.Identity, Message.Get, status);
 		}

NTwain/Triplets/DGControl/DGControl.cs

@@ -62,7 +62,7 @@ namespace NTwain.Triplets
 			}
 		}
 		DeviceEvent _deviceEvent;
-		public DeviceEvent DeviceEvent
+		internal DeviceEvent DeviceEvent
 		{
 			get
 			{
@@ -163,7 +163,7 @@ namespace NTwain.Triplets
 			}
 		}
 		StatusUtf8 _statusUtf8;
-		public StatusUtf8 StatusUtf8
+		internal StatusUtf8 StatusUtf8
 		{
 			get
 			{

NTwain/Triplets/DGImage/DGImage.ImageInfo.cs

@@ -6,11 +6,10 @@ namespace NTwain.Triplets
     /// <summary>
     /// Represents <see cref="DataArgumentType.ImageInfo"/>.
     /// </summary>
-	public sealed class ImageInfo : OpBase
+    sealed class ImageInfo : OpBase
     {
         internal ImageInfo(ITwainSessionInternal session) : base(session) { }
 
-        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1021:AvoidOutParameters", MessageId = "0#")]
         public ReturnCode Get(out TWImageInfo info)
         {
             Session.VerifyState(6, 7, DataGroups.Image, DataArgumentType.ImageInfo, Message.Get);

NTwain/Triplets/DGImage/DGImage.cs

@@ -78,7 +78,7 @@ namespace NTwain.Triplets
         }
 
         ImageInfo _imgInfo;
-		public ImageInfo ImageInfo
+        internal ImageInfo ImageInfo
         {
             get
             {

NTwain/TwainSession.cs

@@ -139,7 +139,7 @@ namespace NTwain
                 TWIdentity id;
                 if (DGControl.Identity.GetDefault(out id) == ReturnCode.Success)
                 {
-                    return new TwainSource(this, id);
+                    return TwainSource.GetInstance(this, id);
                 }
                 return null;
             }
@@ -162,7 +162,7 @@ namespace NTwain
             TWIdentity id;
             if (DGControl.Identity.UserSelect(out id) == ReturnCode.Success)
             {
-                return new TwainSource(this, id);
+                return TwainSource.GetInstance(this, id);
             }
             return null;
         }
@@ -311,7 +311,7 @@ namespace NTwain
             var rc = DGControl.Identity.GetFirst(out srcId);
             while (rc == ReturnCode.Success)
             {
-                yield return new TwainSource(this, srcId);
+                yield return TwainSource.GetInstance(this, srcId);
                 rc = DGControl.Identity.GetNext(out srcId);
             }
         }
@@ -327,6 +327,18 @@ namespace NTwain
             return stat;
         }
 
+        /// <summary>
+        /// Gets the manager status. Only call this at state 3 or higher.
+        /// </summary>
+        /// <param name="session">The session.</param>
+        /// <returns></returns>
+        public TWStatusUtf8 GetStatusUtf8()
+        {
+            TWStatusUtf8 stat;
+            DGControl.StatusUtf8.GetManager(out stat);
+            return stat;
+        }
+
 
         #endregion
 

NTwain/TwainSource.cs

@@ -16,9 +16,21 @@ namespace NTwain
     /// </summary>
     public partial class TwainSource : INotifyPropertyChanged
     {
+        static readonly Dictionary<string, TwainSource> __globalInstances = new Dictionary<string, TwainSource>();
+
+        internal static TwainSource GetInstance(ITwainSessionInternal session, TWIdentity sourceId)
+        {
+            var key = string.Format("{0}|{1}", sourceId.Manufacturer, sourceId.ProductFamily, sourceId.ProductName);
+            if (__globalInstances.ContainsKey(key))
+            {
+                return __globalInstances[key];
+            }
+            return __globalInstances[key] = new TwainSource(session, sourceId);
+        }
+
         ITwainSessionInternal _session;
 
-        internal TwainSource(ITwainSessionInternal session, TWIdentity sourceId)
+        private TwainSource(ITwainSessionInternal session, TWIdentity sourceId)
         {
             _session = session;
             Identity = sourceId;
@@ -84,6 +96,18 @@ namespace NTwain
             _session.DGControl.Status.GetSource(out stat);
             return stat;
         }
+        /// <summary>
+        /// Gets the source status. Only call this at state 4 or higher.
+        /// </summary>
+        /// <param name="session">The session.</param>
+        /// <returns></returns>
+        public TWStatusUtf8 GetStatusUtf8()
+        {
+            TWStatusUtf8 stat;
+            _session.DGControl.StatusUtf8.GetSource(out stat);
+            return stat;
+        }
+
 
         #region properties