Added one direct triplet call for custom values.

NTwain.Net35/NTwain.Net35.csproj

@@ -202,6 +202,9 @@
     <Compile Include="..\NTwain\Triplets\DGControl\DGControl.XferGroup.cs">
       <Link>Triplets\DGControl\DGControl.XferGroup.cs</Link>
     </Compile>
+    <Compile Include="..\NTwain\Triplets\DGCustom.cs">
+      <Link>Triplets\DGCustom.cs</Link>
+    </Compile>
     <Compile Include="..\NTwain\Triplets\DGImage\DGImage.CieColor.cs">
       <Link>Triplets\DGImage\DGImage.CieColor.cs</Link>
     </Compile>

NTwain/ITwainOperation.cs

@@ -24,6 +24,11 @@ namespace NTwain
         /// </summary>
         DGImage DGImage { get; }
 
+        /// <summary>
+        /// Gets the direct triplet operation entry for custom values.
+        /// </summary>
+        DGCustom DGCustom { get; }
+
         /// <summary>
         /// Opens the data source manager. This must be the first method used
         /// before using other TWAIN functions. Calls to this must be followed by <see cref="CloseManager"/> when done with a TWAIN session.

NTwain/NTwain.csproj

@@ -82,6 +82,7 @@
     <Compile Include="Triplets\DGControl\DGControl.Callback2.cs" />
     <Compile Include="Triplets\DGControl\DGControl.CapabilityCustom.cs" />
     <Compile Include="Triplets\DGImage\DGImage.Filter.cs" />
+    <Compile Include="Triplets\DGCustom.cs" />
     <Compile Include="Triplets\OpBase.cs" />
     <Compile Include="Triplets\Dsm.Linux.cs" />
     <Compile Include="Triplets\Dsm.WinOld.cs" />

NTwain/Triplets/DGCustom.cs

@@ -0,0 +1,43 @@
+using NTwain.Data;
+using NTwain.Internals;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace NTwain.Triplets
+{
+    /// <summary>
+    /// Provides direct access to the triplet call.
+    /// </summary>
+    public class DGCustom
+    {
+        ITwainSessionInternal _session;
+        internal DGCustom(ITwainSessionInternal session)
+        {
+            if (session == null) { throw new ArgumentNullException("session"); }
+            _session = session;
+        }
+
+
+        /// <summary>
+        /// Direct DSM_Entry call with full arguments for custom values.
+        /// </summary>
+        /// <param name="group">The group.</param>
+        /// <param name="dat">The dat.</param>
+        /// <param name="message">The message.</param>
+        /// <param name="data">The data.</param>
+        /// <returns></returns>
+        public ReturnCode DsmEntry(
+            DataGroups group,
+            DataArgumentType dat,
+            Message message,
+            ref IntPtr data)
+        {
+            _session.VerifyState(3, 7, group, dat, message);
+            return Dsm.DsmEntry(_session.AppId, _session.SourceId, group, dat, message, ref data);
+        }
+
+        // todo: add other data value types?
+    }
+}

NTwain/TwainSession.cs

@@ -204,6 +204,19 @@ namespace NTwain
             }
         }
 
+        DGCustom _dgCustom;
+        /// <summary>
+        /// Gets the direct triplet operation entry for custom values.
+        /// </summary>
+        public DGCustom DGCustom
+        {
+            get
+            {
+                if (_dgCustom == null) { _dgCustom = new DGCustom(this); }
+                return _dgCustom;
+            }
+        }
+
         #endregion
 
         #region INotifyPropertyChanged Members