Add method to set filexfer options on xferready event.

src/Directory.Build.props

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <!--change these in each release-->
     <VersionPrefix>4.0.0.0</VersionPrefix>
-    <VersionSuffix>alpha.5</VersionSuffix>
+    <VersionSuffix>alpha.6</VersionSuffix>
     
     <!--keep it the same until major # changes-->
     <AssemblyVersion>4.0.0.0</AssemblyVersion>

src/NTwain/TransferReadyEventArgs.cs

@@ -8,11 +8,11 @@ namespace NTwain
     /// </summary>
     public class TransferReadyEventArgs : EventArgs
     {
-        public TransferReadyEventArgs(TWSX imgXferMech, TWSX audXferMech, int pendingCount, TWEJ endOfJobFlag)
+        public TransferReadyEventArgs(TwainAppSession twain, TWSX imgXferMech, TWSX audXferMech, int pendingCount, TWEJ endOfJobFlag)
         {
+            _twain = twain;
             ImgXferMech = imgXferMech;
             AudXferMech = audXferMech;
-            //_twain = twain;
             PendingCount = pendingCount;
             EndOfJobFlag = endOfJobFlag;
         }
@@ -43,9 +43,20 @@ namespace NTwain
         /// </summary>
         public int PendingCount { get; private set; }
 
-        //TW_IMAGEINFO? _imgInfo;
+        private readonly TwainAppSession _twain;
-        //private readonly TwainAppSession _twain;
 
+        /// <summary>
+        /// If the transfer mech is file-related,
+        /// setup the file transfer options here.
+        /// </summary>
+        /// <param name="fileXfer"></param>
+        /// <returns></returns>
+        public STS SetupFileTransfer(ref TW_SETUPFILEXFER fileXfer)
+        {
+            return _twain.SetFileXfer(ref fileXfer);
+        }
+
+        //TW_IMAGEINFO? _imgInfo;
         ///// <summary>
         ///// Gets the tentative image information for the current transfer if applicable.
         ///// This may differ from the final image depending on the transfer mode used (mostly when doing mem xfer).

src/NTwain/TwainAppSession.PropEvents.cs

@@ -3,8 +3,8 @@ using NTwain.Triplets;
 using System;
 using System.Runtime.InteropServices;
 
-namespace NTwain
+namespace NTwain;
-{
+
 // this file contains property and event definitions
 
 partial class TwainAppSession
@@ -16,7 +16,7 @@ namespace NTwain
     {
         get => _appIdentity;
     }
-    TW_IDENTITY_LEGACY _appIdentity;
+    internal TW_IDENTITY_LEGACY _appIdentity;
 
     /// <summary>
     /// Gets the current (opened) data source.
@@ -34,7 +34,7 @@ namespace NTwain
             catch { }
         }
     }
-    TW_IDENTITY_LEGACY _currentDS;
+    internal TW_IDENTITY_LEGACY _currentDS;
 
     /// <summary>
     /// Gets/sets the default data source.
@@ -167,4 +167,3 @@ namespace NTwain
     /// </summary>
     public event TwainEventDelegate<TransferredEventArgs>? Transferred;
 }
-}

src/NTwain/TwainAppSession.Xfers.cs

@@ -23,6 +23,17 @@ namespace NTwain
             return WrapInSTS(DGImage.ExtImageInfo.Get(ref _appIdentity, ref _currentDS, ref container));
         }
 
+        /// <summary>
+        /// Can only be called in state 6, so it's here and only exposed
+        /// in transfer ready event.
+        /// </summary>
+        /// <param name="settings"></param>
+        /// <returns></returns>
+        internal STS SetFileXfer(ref TW_SETUPFILEXFER settings)
+        {
+            return WrapInSTS(DGControl.SetupFileXfer.Set(ref _appIdentity, ref _currentDS, ref settings));
+        }
+
 
         /// <summary>
         /// Start the transfer loop.
@@ -66,7 +77,7 @@ namespace NTwain
             {
                 do
                 {
-                    var readyArgs = new TransferReadyEventArgs(imgXferMech, audXferMech, pending.Count, (TWEJ)pending.EOJ);
+                    var readyArgs = new TransferReadyEventArgs(this, imgXferMech, audXferMech, pending.Count, (TWEJ)pending.EOJ);
                     try
                     {
                         TransferReady?.Invoke(this, readyArgs);