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Testing a basic xfer loop.

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This commit is contained in:
Eugene Wang 2023-04-03 21:25:41 -04:00
parent 0f0f613ced
commit a12abe7ab6
12 changed files with 594 additions and 20 deletions
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7
LICENSE.txt
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@ -1,3 +1,5 @@
# For NTwain
The MIT License (MIT)
Copyright (c) 2012 - 2023 Eugene Wang
@ -21,10 +23,9 @@ FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
# Third Party Code Used
# for twaincs
## For twaincs
Copyright(C) 2013 - 2021 Kodak Alaris Inc.

9
NTwain.sln
View File

@ -24,9 +24,7 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "NTwain", "src\NTwain\NTwain
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "NTwain-temp", "src\NTwain-temp\NTwain-temp.csproj", "{A7020B90-5CE4-43EF-A75D-5E1F9B501CAC}"
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Console32", "samples\Console32\Console32.csproj", "{AAF9FE1B-B695-4AFD-A014-CA4DFDD06A79}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WinForm32", "samples\WinForm32\WinForm32.csproj", "{7792A94E-D0B4-440D-8BD5-CA1CA548782C}"
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WinForm32", "samples\WinForm32\WinForm32.csproj", "{7792A94E-D0B4-440D-8BD5-CA1CA548782C}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
@ -41,10 +39,6 @@ Global
{A7020B90-5CE4-43EF-A75D-5E1F9B501CAC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{A7020B90-5CE4-43EF-A75D-5E1F9B501CAC}.Release|Any CPU.ActiveCfg = Release|Any CPU
{A7020B90-5CE4-43EF-A75D-5E1F9B501CAC}.Release|Any CPU.Build.0 = Release|Any CPU
{AAF9FE1B-B695-4AFD-A014-CA4DFDD06A79}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{AAF9FE1B-B695-4AFD-A014-CA4DFDD06A79}.Debug|Any CPU.Build.0 = Debug|Any CPU
{AAF9FE1B-B695-4AFD-A014-CA4DFDD06A79}.Release|Any CPU.ActiveCfg = Release|Any CPU
{AAF9FE1B-B695-4AFD-A014-CA4DFDD06A79}.Release|Any CPU.Build.0 = Release|Any CPU
{7792A94E-D0B4-440D-8BD5-CA1CA548782C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{7792A94E-D0B4-440D-8BD5-CA1CA548782C}.Debug|Any CPU.Build.0 = Debug|Any CPU
{7792A94E-D0B4-440D-8BD5-CA1CA548782C}.Release|Any CPU.ActiveCfg = Release|Any CPU
@ -54,7 +48,6 @@ Global
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(NestedProjects) = preSolution
{AAF9FE1B-B695-4AFD-A014-CA4DFDD06A79} = {707B4313-8EF8-4D0F-A95E-590783422187}
{7792A94E-D0B4-440D-8BD5-CA1CA548782C} = {707B4313-8EF8-4D0F-A95E-590783422187}
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution

13
src/NTwain/Data/TWAINH_EXTRAS.cs
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@ -2,6 +2,7 @@
using System;
using System.Globalization;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes;
using System.Text;
namespace NTwain.Data
@ -621,9 +622,15 @@ namespace NTwain.Data
try
{
#if NETFRAMEWORK
var bytes = new byte[Size];
Marshal.Copy(locked, bytes, 0, bytes.Length);
val = Encoding.UTF8.GetString(bytes);
// safe method but with 2 copies (arr and parsed string)
var bytes = new byte[Size];
Marshal.Copy(locked, bytes, 0, bytes.Length);
val = Encoding.UTF8.GetString(bytes);
//// unsafe method with 1 copy (does it work?)
//sbyte* bytes = (sbyte*)locked;
//var str = new string(bytes, 0, length, Encoding.UTF8);
//return str;
#else
val = Marshal.PtrToStringUTF8(locked, (int)Size);
#endif

340
src/NTwain/Native/BITMAP.cs Normal file
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@ -0,0 +1,340 @@
using System;
using System.Runtime.InteropServices;
using System.Text;
namespace NTwain.Native
{
// this is a good read
// http://atlc.sourceforge.net/bmp.html
/// <summary>
/// Defines the dimensions and color information for a DIB.
/// </summary>
[StructLayout(LayoutKind.Sequential)]
struct BITMAPINFO
{
/// <summary>
/// Structure that contains information about the dimensions of color format.
/// </summary>
public BITMAPINFOHEADER bmiHeader;
/// <summary>
/// This contains one of the following:
/// 1. An array of RGBQUAD. The elements of the array that make up the color table.
/// 2. An array of 16-bit unsigned integers that specifies indexes into the currently realized logical palette. This use of bmiColors is allowed for functions that use DIBs.
/// The number of entries in the array depends on the values of the biBitCount and biClrUsed members of the BITMAPINFOHEADER structure.
/// </summary>
public IntPtr bmiColors;
};
/// <summary>
/// Structure that contains information about the dimensions and color format of a DIB.
/// </summary>
[StructLayout(LayoutKind.Sequential)]
struct BITMAPINFOHEADER
{
#region fields
/// <summary>
/// The number of bytes required by the structure.
/// </summary>
public uint biSize;
/// <summary>
/// The width of the bitmap, in pixels.
/// If Compression is JPEG or PNG, the Width member specifies the width of the decompressed
/// JPEG or PNG image file, respectively.
/// </summary>
public int biWidth;
/// <summary>
/// The height of the bitmap, in pixels. If Height is positive,
/// the bitmap is a bottom-up DIB and its origin is the lower-left corner.
/// If Height is negative, the bitmap is a top-down DIB and its origin is the upper-left corner.
/// If Height is negative, indicating a top-down DIB, Compression must be either RGB or BITFIELDS. Top-down DIBs cannot be compressed.
/// If Compression is JPEG or PNG, the Height member specifies the height of the decompressed JPEG or PNG image file, respectively.
/// </summary>
public int biHeight;
/// <summary>
/// The number of planes for the target device. This value must be set to 1.
/// </summary>
public ushort biPlanes;
/// <summary>
/// The number of bits-per-pixel. The BitCount member
/// determines the number of bits that define each pixel and the maximum number of colors in the bitmap.
/// </summary>
public ushort biBitCount;
/// <summary>
/// The type of compression for a compressed bottom-up bitmap (top-down DIBs cannot be compressed).
/// </summary>
public CompressionType biCompression;
/// <summary>
/// The size, in bytes, of the image. This may be set to zero for RGB bitmaps.
/// If Compression is JPEG or PNG, SizeImage indicates the size of the JPEG or PNG image buffer, respectively.
/// </summary>
public uint biSizeImage;
/// <summary>
/// The horizontal resolution, in pixels-per-meter, of the target device for the bitmap.
/// An application can use this value to select a bitmap from a resource group that
/// best matches the characteristics of the current device.
/// </summary>
public int biXPelsPerMeter;
/// <summary>
/// The vertical resolution, in pixels-per-meter, of the target device for the bitmap.
/// </summary>
public int biYPelsPerMeter;
/// <summary>
/// The number of color indexes in the color table that are actually used by the bitmap.
/// If this value is zero, the bitmap uses the maximum number of colors corresponding to
/// the value of the BitCount member for the compression mode specified by Compression.
/// </summary>
public uint biClrUsed;
/// <summary>
/// The number of color indexes that are required for displaying the bitmap.
/// If this value is zero, all colors are required.
/// </summary>
public uint biClrImportant;
#endregion
#region utilities
const double METER_INCH_RATIO = 39.3700787;
/// <summary>
/// Gets the horizontal dpi of the bitmap.
/// </summary>
/// <returns></returns>
public float GetXDpi()
{
return (float)Math.Round(biXPelsPerMeter / METER_INCH_RATIO, 0);
}
/// <summary>
/// Gets the vertical dpi of the bitmap.
/// </summary>
/// <returns></returns>
public float GetYDpi()
{
return (float)Math.Round(biYPelsPerMeter / METER_INCH_RATIO, 0);
}
/// <summary>
/// Gets the size of the structure.
/// </summary>
/// <returns></returns>
public static uint GetByteSize()
{
return (uint)Marshal.SizeOf(typeof(BITMAPINFOHEADER));
}
/// <summary>
/// Checks to see if this structure contain valid data.
/// It also fills in any missing pieces if possible.
/// </summary>
/// <returns></returns>
public bool Validate()
{
if (biHeight != 0 && biWidth != 0 && biBitCount != 0)
{
if (biSize == 0)
{
biSize = GetByteSize();
}
if (biClrUsed == 0)
{
switch (biBitCount)
{
case 1:
biClrUsed = 2;
break;
case 4:
biClrUsed = 16;
break;
case 8:
biClrUsed = 256;
break;
}
}
if (biSizeImage == 0)
{
biSizeImage = (uint)((((
biWidth * biBitCount) + 31) & ~31) >> 3) * (uint)Math.Abs(biHeight);
}
return true;
}
return false;
}
/// <summary>
/// Gets the pointer to scan0 given the header pointer.
/// </summary>
/// <param name="headerPtr">The header PTR.</param>
/// <returns></returns>
public IntPtr GetScan0(IntPtr headerPtr)
{
int p = (int)biClrUsed;
if ((p == 0) && (biBitCount <= 8))
{
p = 1 << biBitCount;
}
p = (p * 4) + (int)biSize + headerPtr.ToInt32();
return new IntPtr(p);
}
/// <summary>
/// Gets whether the bitmap is bottom-up or top-down format.
/// </summary>
/// <value>
/// <c>true</c> if this instance is bottom up image; otherwise, <c>false</c>.
/// </value>
/// <returns></returns>
public bool IsBottomUpImage
{
get
{
return biHeight > 0;
}
}
///// <summary>
///// Gets the System.Drawing pixel format of current structure.
///// </summary>
///// <returns></returns>
//public PixelFormat GetDrawingPixelFormat()
//{
// switch (biBitCount)
// {
// case 1:
// return PixelFormat.Format1bppIndexed;
// case 4:
// return PixelFormat.Format4bppIndexed;
// case 8:
// return PixelFormat.Format8bppIndexed;
// case 16:
// return PixelFormat.Format16bppRgb565;
// case 24:
// return PixelFormat.Format24bppRgb;
// case 32:
// return PixelFormat.Format32bppRgb;
// case 48:
// return PixelFormat.Format48bppRgb;
// }
// return PixelFormat.DontCare;
//}
///// <summary>
///// Gets the color palette that's contained in the header.
///// Note not all images will have palette, so check if the return value
///// is null before using it.
///// </summary>
///// <returns></returns>
//public ColorPalette? GetDrawingPalette(IntPtr headerPtr)
//{
// //if (format == PixelFormat.Format8bppIndexed)
// //{
// // // update color palette to grayscale version
// // ColorPalette grayPallet = bitmap.Palette;
// // for (int i = 0; i < grayPallet.Entries.Length; i++)
// // {
// // grayPallet.Entries[i] = Color.FromArgb(i, i, i);
// // }
// // bitmap.Palette = grayPallet; // this is what makes the gray pallet take effect
// //}
// if (biClrUsed > 0)
// {
// byte[] data = new byte[biClrUsed * 4];
// Marshal.Copy(new IntPtr(headerPtr.ToInt32() + biSize), data, 0, data.Length);
// var dummy = new System.Drawing.Bitmap(1, 1, GetDrawingPixelFormat());
// ColorPalette pal = dummy.Palette;
// dummy.Dispose();
// int index = 0;
// int setCount = data.Length / 4;
// for (int i = 0; i < setCount; i++)
// {
// index = i * 4;
// pal.Entries[i] = Color.FromArgb(data[index + 2], data[index + 1], data[index]);
// }
// return pal;
// }
// return null;
//}
/// <summary>
/// Gets the stride size of this bitmap.
/// </summary>
/// <returns></returns>
public int GetStride()
{
int bitsPerRow = (biBitCount * biWidth);
int strideTest = bitsPerRow / 8 + (bitsPerRow % 8 != 0 ? 1 : 0);
int overage = strideTest % 4;
if (overage > 0)
{
strideTest += (4 - overage);
}
return strideTest;
}
/// <summary>
/// Returns a <see cref="System.String" /> that represents this instance.
/// </summary>
/// <returns>
/// A <see cref="System.String" /> that represents this instance.
/// </returns>
public override string ToString()
{
return new StringBuilder().Append("BitmapInfoHeader:")
.Append("\r\n\tSize = " + biSize)
.Append("\r\n\tWidth = " + biWidth)
.Append("\r\n\tHeight = " + biHeight)
.Append("\r\n\tPlanes = " + biPlanes)
.Append("\r\n\tBitCount = " + biBitCount)
.Append("\r\n\tCompression = " + biCompression)
.Append("\r\n\tSizeImage = " + biSizeImage)
.Append("\r\n\tXPixelsPerMeter = " + biXPelsPerMeter)
.Append("\r\n\tYPixelsPerMeter = " + biYPelsPerMeter)
.Append("\r\n\tColorUsed = " + biClrUsed)
.Append("\r\n\tColorImportant = " + biClrImportant).ToString();
}
#endregion
/// <summary>
/// Indicates the bitmap compression of <seealso cref="BITMAPINFOHEADER"/>.
/// </summary>
public enum CompressionType : uint
{
/// <summary>
/// An uncompressed format.
/// </summary>
BI_RGB = 0,
/// <summary>
/// A run-length encoded (RLE) format for bitmaps with 8 bpp. The compression format is a 2-byte format consisting of a count byte followed by a byte containing a color index. For more information, see Bitmap Compression.
/// </summary>
BI_RLE8 = 1,
/// <summary>
/// An RLE, format for bitmaps with 4 bpp. The compression format is a 2-byte format consisting of a count byte followed by two word-length color indexes. For more information, see Bitmap Compression.
/// </summary>
BI_RLE4 = 2,
/// <summary>
/// Specifies that the bitmap is not compressed and that the color table consists of three DWORD color masks that specify the red, green, and blue components of each pixel.
/// This is valid when used with 16- and 32-bpp bitmaps.
/// </summary>
BI_BITFIELDS = 3,
/// <summary>
/// Indicates that the image is a JPEG image.
/// </summary>
BI_JPEG = 4,
/// <summary>
/// Indicates that the image is a PNG image.
/// </summary>
BI_PNG = 5
}
};
[StructLayout(LayoutKind.Sequential, Pack = 1)]
struct BITMAPFILEHEADER
{
public ushort bfType;
public uint bfSize;
public ushort bfReserved1;
public ushort bfReserved2;
public uint bfOffBits;
}
}

75
src/NTwain/Native/TIFF.cs Normal file
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@ -0,0 +1,75 @@
///////////////////////////////////////////////////////////////////////////////////////
//
// TwainWorkingGroup.TWAIN
//
// This is a wrapper class for basic TWAIN functionality. It establishes
// behavior that every application should adhere to. It also hides OS
// specific details, so that toolkits or applications can use one unified
// interface to TWAIN.
//
///////////////////////////////////////////////////////////////////////////////////////
// Author Date TWAIN Comment
// M.McLaughlin 17-May-2021 2.5.0.0 Updated to latest spec
// M.McLaughlin 13-Mar-2019 2.4.0.3 Add language code page support for strings
// M.McLaughlin 13-Nov-2015 2.4.0.0 Updated to latest spec
// M.McLaughlin 13-Sep-2015 2.3.1.2 DsmMem bug fixes
// M.McLaughlin 26-Aug-2015 2.3.1.1 Log fix and sync with TWAIN Direct
// M.McLaughlin 13-Mar-2015 2.3.1.0 Numerous fixes
// M.McLaughlin 13-Oct-2014 2.3.0.4 Added logging
// M.McLaughlin 24-Jun-2014 2.3.0.3 Stability fixes
// M.McLaughlin 21-May-2014 2.3.0.2 64-Bit Linux
// M.McLaughlin 27-Feb-2014 2.3.0.1 AnyCPU support
// M.McLaughlin 21-Oct-2013 2.3.0.0 Initial Release
///////////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2013-2021 Kodak Alaris Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
///////////////////////////////////////////////////////////////////////////////////////
using System.Runtime.InteropServices;
namespace NTwain.Native
{
/// <summary>
/// The TIFF file header.
/// Needed for supporting DAT.IMAGENATIVEXFER...
/// </summary>
[StructLayout(LayoutKind.Sequential, Pack = 1)]
struct TIFFHEADER
{
public ushort u8ByteOrder;
public ushort u16Version;
public uint u32OffsetFirstIFD;
public ushort u16u16IFD;
}
/// <summary>
/// An individual TIFF Tag.
/// Needed for supporting DAT.IMAGENATIVEXFER...
/// </summary>
[StructLayout(LayoutKind.Sequential, Pack = 1)]
struct TIFFTAG
{
public ushort u16Tag;
public ushort u16Type;
public uint u32Count;
public uint u32Value;
}
}

11
src/NTwain/ThreadMarshaller.Windows.cs
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@ -5,7 +5,11 @@ using System.Windows.Threading;
namespace NTwain
{
/// <summary>
/// An <see cref="IThreadMarshaller"/> that can be used
/// to integrate <see cref="TwainSession"/> with
/// an existing Winforms app.
/// </summary>
public class WinformMarshaller : IThreadMarshaller
{
private readonly Control control;
@ -26,6 +30,11 @@ namespace NTwain
}
}
/// <summary>
/// An <see cref="IThreadMarshaller"/> that can be used
/// to integrate <see cref="TwainSession"/> with
/// an existing WPF app.
/// </summary>
public class WpfMarshaller : IThreadMarshaller
{
private readonly Dispatcher dispatcher;

2
src/NTwain/ThreadMarshaller.cs
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@ -24,7 +24,7 @@ namespace NTwain
}
/// <summary>
/// No marshalling occurs. Invokes happen right in place.
/// No marshalling occurs. Invokes happen right in place synchronously.
/// </summary>
public class InPlaceMarshaller : IThreadMarshaller
{

47
src/NTwain/TransferErrorEventArgs.cs Normal file
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@ -0,0 +1,47 @@
using NTwain.Data;
using System;
namespace NTwain
{
/// <summary>
/// Contains TWAIN codes and source status when an error is encountered during transfer.
/// </summary>
public class TransferErrorEventArgs : EventArgs
{
/// <summary>
/// Initializes a new instance of the <see cref="TransferErrorEventArgs"/> class.
/// </summary>
/// <param name="error">The error.</param>
public TransferErrorEventArgs(Exception error)
{
Exception = error;
}
/// <summary>
/// Initializes a new instance of the <see cref="TransferErrorEventArgs"/> class.
/// </summary>
/// <param name="code">The code.</param>
/// <param name="status">Additional status info from TWAIN.</param>
public TransferErrorEventArgs(STS code, string? info)
{
Code = code;
Info = info;
}
/// <summary>
/// Gets the return code or condition code from the transfer.
/// </summary>
public STS Code { get; private set; }
/// <summary>
/// Gets the additional status info from TWAIN.
/// </summary>
public string? Info { get; private set; }
/// <summary>
/// Gets the exception if the error is from some exception
/// and not from TWAIN.
/// </summary>
public Exception? Exception { get; private set; }
}
}

5
src/NTwain/TwainSession.PropEvents.cs
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@ -135,5 +135,10 @@ namespace NTwain
/// Fires when the source has some device event happening.
/// </summary>
public event Action<TwainSession, TW_DEVICEEVENT>? DeviceEvent;
/// <summary>
/// Fires when there's an error during transfer.
/// </summary>
public event EventHandler<TransferErrorEventArgs>? TransferError;
}
}

5
src/NTwain/TwainSession.Windows.cs
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@ -36,6 +36,8 @@ namespace NTwain
/// <summary>
/// Registers this session for use in a WPF UI thread.
/// This requires the hwnd used in <see cref="OpenDSM(IntPtr)"/>
/// be a valid WPF window handle.
/// </summary>
public void AddWpfHook()
{
@ -57,12 +59,11 @@ namespace NTwain
}
}
bool System.Windows.Forms.IMessageFilter.PreFilterMessage(ref System.Windows.Forms.Message m)
bool IMessageFilter.PreFilterMessage(ref Message m)
{
return CheckIfTwainMessage(m.HWnd, m.Msg, m.WParam, m.LParam);
}
// wpf use with HwndSource.FromHwnd(Handle).AddHook(
IntPtr WpfHook(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
handled = CheckIfTwainMessage(hwnd, msg, wParam, lParam);

91
src/NTwain/TwainSession.Xfers.cs
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@ -1,6 +1,8 @@
using NTwain.Data;
using NTwain.Triplets;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
@ -10,5 +12,94 @@ namespace NTwain
partial class TwainSession
{
/// <summary>
/// Start the transfer loop.
/// This should be called after receiving
/// <see cref="MSG.XFERREADY"/> in the background thread.
/// </summary>
void EnterTransferRoutine()
{
// default options if source don't support them or whatever
bool xferImage = true;
bool xferAudio = false;
var imgXferMech = TWSX.NATIVE;
var audXferMech = TWSX.NATIVE;
if (DGControl.XferGroup.Get(ref _appIdentity, ref _currentDS, out DG xferType) == STS.SUCCESS)
{
xferAudio = (xferType & DG.AUDIO) == DG.AUDIO;
var dsName = _currentDS.ProductName.ToString();
// check for Plustek OpticSlim 2680H, this scanner returns wrong xferGroup after first scanning
if (dsName.IndexOf("Plustek", StringComparison.OrdinalIgnoreCase) > -1 &&
dsName.IndexOf("OpticSlim", StringComparison.OrdinalIgnoreCase) > -1 &&
dsName.IndexOf("2680H", StringComparison.OrdinalIgnoreCase) > -1)
{
xferImage = true;
}
else
{
// some DS end up getting none but we will assume it's image
xferImage = xferType == 0 || (xferType & DG.IMAGE) == DG.IMAGE;
}
}
//if (xferImage)
//{
// imgXferMech = session.CurrentSource.Capabilities.ICapXferMech.GetCurrent();
//}
//if (xferAudio)
//{
// audXferMech = session.CurrentSource.Capabilities.ACapXferMech.GetCurrent();
//}
TW_PENDINGXFERS pending = default;
var rc = DGControl.PendingXfers.Get(ref _appIdentity, ref _currentDS, ref pending);
if (rc == STS.SUCCESS)
{
do
{
// cancel for now
//rc = DGControl.PendingXfers.Reset(ref _appIdentity, ref _currentDS, ref pending);
rc = DGControl.PendingXfers.EndXfer(ref _appIdentity, ref _currentDS, ref pending);
//if (xferType.HasFlag(DG.AUDIO))
//{
// DoTransferAudio();
//}
//else // just defaults to image
//{
// DoTransferImage();
//}
} while (rc == STS.SUCCESS && pending.Count != 0);
}
else
{
HandleNonSuccessXferCode(rc);
}
_uiThreadMarshaller.BeginInvoke(() =>
{
DisableSource();
});
}
private void HandleNonSuccessXferCode(STS rc)
{
switch (rc)
{
case STS.SUCCESS:
case STS.XFERDONE:
case STS.CANCEL:
// ok to keep going
break;
default:
var status = GetLastStatus(false);
var text = GetStatusText(status);
// TODO: raise error event
break;
}
}
}
}

9
src/NTwain/TwainSession.cs
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@ -97,8 +97,8 @@ namespace NTwain
}
internal IntPtr _hwnd;
internal TW_USERINTERFACE _userInterface; // kept around for disable use
TW_EVENT _procEvent = default; // kept here so the alloc/free only happens once
internal TW_USERINTERFACE _userInterface; // kept around for disable to use
TW_EVENT _procEvent; // kept here so the alloc/free only happens once
// test threads a bit
readonly BlockingCollection<MSG> _bgPendingMsgs = new();
private readonly IThreadMarshaller _uiThreadMarshaller;
@ -138,6 +138,11 @@ namespace NTwain
}
break;
case MSG.XFERREADY:
_uiThreadMarshaller.Invoke(() =>
{
State = STATE.S6;
});
EnterTransferRoutine();
break;
}