public bool StartScan(ScanSettings settings, object extTag)
{
bool scanning = false;
try
{
_extTag = extTag;
_messageHook.UseFilter = true;
scanning = DataSource.Open(settings);
return(scanning);
}
catch (TwainException e)
{
DataSource.Close();
EndingScan();
throw e;
}
finally
{
// Remove the message hook if scan setup failed
if (!scanning)
{
EndingScan();
}
}
}
protected void CloseDsAndCompleteScanning(Exception exception)
{
EndingScan();
DataSource.Close();
try
{
ScanningComplete(this, new ScanningCompleteEventArgs(exception, this._extTag));
}
catch
{
}
}
/// <summary>
/// 做open→設定各種CAPABILITY→EnableDS→等回傳圖→end
/// </summary>
/// <param name="settings"></param>
public void StartScan(ScanSettings settings)
{
bool scanning = false;
try
{
_messageHook.UseFilter = true;
scanning = DataSource.Open(settings, UseIncrementalMemoryXfer);
}
catch (TwainException e)
{
DataSource.Close();
EndingScan();
throw e;
}
finally
{
// Remove the message hook if scan setup failed
if (!scanning)
{
EndingScan();
}
}
}
protected void TransferPictures()
{
if (DataSource.SourceId.Id == 0)
{
return;
}
PendingXfers pendingTransfer = new PendingXfers();
TwainResult result;
try
{
do
{
pendingTransfer.Count = 0;
IntPtr hbitmap = IntPtr.Zero;
// Get the image info
ImageInfo imageInfo = new ImageInfo();
result = Twain32Native.DsImageInfo(
ApplicationId,
DataSource.SourceId,
DataGroup.Image,
DataArgumentType.ImageInfo,
Message.Get,
imageInfo);
if (result != TwainResult.Success)
{
DataSource.Close();
break;
}
// Transfer the image from the device
result = Twain32Native.DsImageTransfer(
ApplicationId,
DataSource.SourceId,
DataGroup.Image,
DataArgumentType.ImageNativeXfer,
Message.Get,
ref hbitmap);
if (result != TwainResult.XferDone)
{
DataSource.Close();
break;
}
// End pending transfers
result = Twain32Native.DsPendingTransfer(
ApplicationId,
DataSource.SourceId,
DataGroup.Control,
DataArgumentType.PendingXfers,
Message.EndXfer,
pendingTransfer);
if (result != TwainResult.Success)
{
DataSource.Close();
break;
}
if (hbitmap == IntPtr.Zero)
{
log.Warn("Transfer complete but bitmap pointer is still null.");
}
else
{
using (var renderer = new BitmapRenderer(hbitmap))
{
TransferImageEventArgs args = new TransferImageEventArgs(renderer.RenderToBitmap(), pendingTransfer.Count, this._extTag);
TransferImage(this, args);
if (!args.ContinueScanning)
{
break;
}
}
}
}while (pendingTransfer.Count != 0);
}
finally
{
// Reset any pending transfers
result = Twain32Native.DsPendingTransfer(
ApplicationId,
DataSource.SourceId,
DataGroup.Control,
DataArgumentType.PendingXfers,
Message.Reset,
pendingTransfer);
}
}
protected void TransferPicturesIncremental()
{
// see http://www.twain.org/wp-content/uploads/2017/03/TWAIN-2.4-Specification.pdf
// page 4-20
Console.WriteLine("TransferPicturesIncremental...");
Logger.WriteLog(LOG_LEVEL.LL_NORMAL_LOG, "TransferPicturesIncremental...");
if (DataSource.SourceId.Id == 0)
{
return;
}
PendingXfers pendingTransfer = new PendingXfers();
TwainResult result;
try
{
int recievedBlockCount = 1;
do
{
pendingTransfer.Count = 0; // the Twain source will fill this in during DsPendingTransfer
Console.WriteLine("Get the image info...");
// Get the image info
ImageInfo imageInfo = new ImageInfo();
result = Twain32Native.DsImageInfo(
ApplicationId,
DataSource.SourceId,
DataGroup.Image,
DataArgumentType.ImageInfo,
Message.Get,
imageInfo);
if (result != TwainResult.Success)
{
DataSource.Close();
break;
}
/*Console.WriteLine("Get the image layout...");
* ImageLayout imageLayout = new ImageLayout();
* result = Twain32Native.DsImageLayout(
* ApplicationId,
* DataSource.SourceId,
* DataGroup.Image,
* DataArgumentType.ImageLayout,
* Message.GetCurrent,
* imageLayout);
*
* if (result != TwainResult.Success)
* {
* DataSource.Close();
* break;
* }*/
// Setup Destination Bitmap
Bitmap bitmap = BitmapRenderer.NewBitmapForImageInfo(imageInfo);
Console.WriteLine("Setup incremental Memory XFer...");
// Setup incremental Memory XFer
SetupMemXfer setupMemXfer = new SetupMemXfer();
result = Twain32Native.DsSetupMemXfer(
ApplicationId,
DataSource.SourceId,
DataGroup.Control,
DataArgumentType.SetupMemXfer,
Message.Get,
setupMemXfer
);
if (result != TwainResult.Success)
{
DataSource.Close();
break;
}
Console.WriteLine("allocate the preferred buffer size...");
// allocate the preferred buffer size
// see twain spec pdf, page 4-21
ImageMemXfer imageMemXfer = new ImageMemXfer();
try
{
imageMemXfer.Memory.Flags = MemoryFlags.AppOwns | MemoryFlags.Pointer;
imageMemXfer.Memory.Length = setupMemXfer.MinBufSize; // 對於A8 scanner，Preferred = MaxBufSize，太大了，所以我們選小一點的
imageMemXfer.Memory.TheMem = Kernel32Native.GlobalAlloc(GlobalAllocFlags.MemFixed, (int)setupMemXfer.MinBufSize * 2); // 不知道為什麼原本她size寫要*2倍
imageMemXfer.Compression = Compression.None;
if (imageMemXfer.Memory.TheMem == IntPtr.Zero)
{
Logger.WriteLog(LOG_LEVEL.LL_SERIOUS_ERROR, "error allocating buffer for memory transfer");
throw new TwainException("error allocating buffer for memory transfer");
}
long pixels_written = 0;
long total_pixels = imageInfo.ImageWidth * imageInfo.ImageLength;
do
{
// perform a transfer
result = Twain32Native.DsImageMemXfer(
ApplicationId,
DataSource.SourceId,
DataGroup.Image,
DataArgumentType.ImageMemXfer,
Message.Get,
imageMemXfer
);
//string savePath = @"C:\Users\Tenny\Pictures\TwainTest\tempBitmap_";
//savePath += i.ToString() + @".bmp";
if (result == TwainResult.Success || result == TwainResult.XferDone)
{
// dibArray是這次Buffer的RGB陣列
byte[] dibArray = ShiftPixels(ref imageMemXfer, imageInfo.BitsPerPixel / 8);
BitmapRenderer.TransferPixels(bitmap, imageInfo, imageMemXfer);
pixels_written += (imageMemXfer.BytesWritten * 8) / imageInfo.BitsPerPixel;
double percent_complete = (double)pixels_written / (double)total_pixels;
if (result == TwainResult.XferDone)
{
percent_complete = 1.0;
// 算出空白區域的高度，裁切尾端部分
int blankHeight = GetCropHeight(bitmap);
if (blankHeight > 0 && blankHeight < imageInfo.ImageLength)
{
bitmap = cropImage(bitmap, blankHeight);
}
}
// fire the transfer event
TransferImageEventArgs args = new TransferImageEventArgs(bitmap, result != TwainResult.XferDone, (float)percent_complete);
TransferImage(this, args);
if (!args.ContinueScanning)
{
result = TwainResult.XferDone;
}
}
recievedBlockCount++;
} while (result == TwainResult.Success);
}
finally
{
if (imageMemXfer.Memory.TheMem != IntPtr.Zero)
{
Kernel32Native.GlobalFree(imageMemXfer.Memory.TheMem);
imageMemXfer.Memory.TheMem = IntPtr.Zero;
}
}
// End pending transfers
result = Twain32Native.DsPendingTransfer(
ApplicationId,
DataSource.SourceId,
DataGroup.Control,
DataArgumentType.PendingXfers,
Message.EndXfer,
pendingTransfer);
if (result != TwainResult.Success)
{
DataSource.Close();
break;
}
}while (pendingTransfer.Count != 0);
}
finally
{
// Reset any pending transfers
result = Twain32Native.DsPendingTransfer(
ApplicationId,
DataSource.SourceId,
DataGroup.Control,
DataArgumentType.PendingXfers,
Message.Reset,
pendingTransfer);
Logger.WriteLog(LOG_LEVEL.LL_NORMAL_LOG, "TransferPicturesIncremental...done.");
}
}
protected void TransferPictures()
{
// see http://www.twain.org/wp-content/uploads/2017/03/TWAIN-2.4-Specification.pdf
// page (3-20)
if (DataSource.SourceId.Id == 0)
{
return;
}
PendingXfers pendingTransfer = new PendingXfers();
TwainResult result;
try
{
do
{
pendingTransfer.Count = 0; // the Twain source will fill this in during DsPendingTransfer
IntPtr hbitmap = IntPtr.Zero;
// Get the image info
ImageInfo imageInfo = new ImageInfo();
result = Twain32Native.DsImageInfo(
ApplicationId,
DataSource.SourceId,
DataGroup.Image,
DataArgumentType.ImageInfo,
Message.Get,
imageInfo);
if (result != TwainResult.Success)
{
DataSource.Close();
break;
}
Bitmap bitmap;
try {
// Transfer the image from the device
result = Twain32Native.DsImageTransfer(
ApplicationId,
DataSource.SourceId,
DataGroup.Image,
DataArgumentType.ImageNativeXfer,
Message.Get,
ref hbitmap);
if (result != TwainResult.XferDone)
{
DataSource.Close();
break;
}
if (hbitmap == IntPtr.Zero)
{
throw new TwainException("Transfer complete, but bitmap pointer is still null.");
}
bitmap = BitmapRenderer.NewBitmapFromHBitmap(hbitmap);
} finally {
if (hbitmap != IntPtr.Zero)
{
Kernel32Native.GlobalFree(hbitmap);
hbitmap = IntPtr.Zero;
}
}
// End pending transfers
result = Twain32Native.DsPendingTransfer(
ApplicationId,
DataSource.SourceId,
DataGroup.Control,
DataArgumentType.PendingXfers,
Message.EndXfer,
pendingTransfer);
if (result != TwainResult.Success)
{
DataSource.Close();
break;
}
// fire the transfer event...
TransferImageEventArgs args = new TransferImageEventArgs(bitmap, pendingTransfer.Count != 0, 1.0f);
TransferImage(this, args);
if (!args.ContinueScanning)
{
break;
}
}while (pendingTransfer.Count != 0);
}
finally
{
// Reset any pending transfers
result = Twain32Native.DsPendingTransfer(
ApplicationId,
DataSource.SourceId,
DataGroup.Control,
DataArgumentType.PendingXfers,
Message.Reset,
pendingTransfer);
}
}
protected IList <IntPtr> TransferPictures()
{
if (DataSource.SourceId.Id == 0)
{
return(null);
}
List <IntPtr> picturePointers = new List <IntPtr>();
PendingXfers pendingTransfer = new PendingXfers();
TwainResult result;
do
{
pendingTransfer.Count = 0;
IntPtr hbitmap = IntPtr.Zero;
ImageInfo imageInfo = new ImageInfo();
// Get the image info
result = Twain32Native.DsImageInfo(
ApplicationId,
DataSource.SourceId,
DataGroup.Image,
DataArgumentType.ImageInfo,
Message.Get,
imageInfo);
if (result != TwainResult.Success)
{
DataSource.Close();
break;
}
// Transfer the image from the device
result = Twain32Native.DsImageTransfer(
ApplicationId,
DataSource.SourceId,
DataGroup.Image,
DataArgumentType.ImageNativeXfer,
Message.Get,
ref hbitmap);
if (result != TwainResult.XferDone)
{
DataSource.Close();
break;
}
// End pending transfers
result = Twain32Native.DsPendingTransfer(
ApplicationId,
DataSource.SourceId,
DataGroup.Control,
DataArgumentType.PendingXfers,
Message.EndXfer,
pendingTransfer);
if (result != TwainResult.Success)
{
DataSource.Close();
break;
}
if (hbitmap == IntPtr.Zero)
{
log.Warn("Transfer complete but bitmap pointer is still null.");
}
else
{
picturePointers.Add(hbitmap);
}
}while (pendingTransfer.Count != 0);
// Reset any pending transfers
result = Twain32Native.DsPendingTransfer(
ApplicationId,
DataSource.SourceId,
DataGroup.Control,
DataArgumentType.PendingXfers,
Message.Reset,
pendingTransfer);
return(picturePointers);
}
protected IntPtr FilterMessage(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
if (DataSource.SourceId.Id == 0)
{
handled = false;
return(IntPtr.Zero);
}
int pos = User32Native.GetMessagePos();
WindowsMessage message = new WindowsMessage();
message.hwnd = hwnd;
message.message = msg;
message.wParam = wParam;
message.lParam = lParam;
message.time = User32Native.GetMessageTime();
message.x = (short)pos;
message.y = (short)(pos >> 16);
Marshal.StructureToPtr(message, _eventMessage.EventPtr, false);
_eventMessage.Message = 0;
TwainResult result = Twain32Native.DsEvent(
ApplicationId,
DataSource.SourceId,
DataGroup.Control,
DataArgumentType.Event,
Message.ProcessEvent,
ref _eventMessage);
if (result == TwainResult.NotDSEvent)
{
handled = false;
return(IntPtr.Zero);
}
switch (_eventMessage.Message)
{
case Message.XFerReady:
IList <IntPtr> imagePointers = TransferPictures();
foreach (IntPtr image in imagePointers)
{
using (var renderer = new BitmapRenderer(image))
{
Images.Add(renderer.RenderToBitmap());
}
}
EndingScan();
DataSource.Close();
ScanningComplete(this, EventArgs.Empty);
break;
case Message.CloseDS:
EndingScan();
DataSource.Close();
break;
case Message.CloseDSOK:
EndingScan();
DataSource.Close();
break;
case Message.DeviceEvent:
break;
}
handled = true;
return(IntPtr.Zero);
}
