private async Task GetImagesFromPage(PdfPage page, ImportParams importParams, ScannedImageSource.Concrete source)
{
if (page.CustomValues.Elements.ContainsKey("/NAPS2ImportedPage"))
{
source.Put(await ExportRawPdfPage(page, importParams));
return;
}
// Get resources dictionary
var resources = page.Elements.GetDictionary("/Resources");
// Get external objects dictionary
var xObjects = resources?.Elements.GetDictionary("/XObject");
if (xObjects == null)
{
return;
}
// Iterate references to external objects
foreach (var item in xObjects.Elements.Values)
{
// Is external object an image?
if (!((item as PdfReference)?.Value is PdfDictionary xObject) ||
xObject.Elements.GetString("/Subtype") != "/Image")
{
continue;
}
// Support multiple filter schemes
var element = xObject.Elements.Single(x => x.Key == "/Filter");
var elementAsArray = element.Value as PdfArray;
var elementAsName = element.Value as PdfName;
if (elementAsArray != null)
{
var arrayElements = elementAsArray.Elements.Select(x => x.ToString()).ToArray();
if (arrayElements.Length == 2)
{
source.Put(DecodeImage(arrayElements[1], page, xObject, Filtering.Decode(xObject.Stream.Value, arrayElements[0]), importParams));
}
}
else if (elementAsName != null)
{
source.Put(DecodeImage(elementAsName.Value, page, xObject, xObject.Stream.Value, importParams));
}
else
{
throw new NotImplementedException("Unsupported filter");
}
}
}
protected override async Task ScanInternal(ScannedImageSource.Concrete source)
{
await Task.Factory.StartNew(async() =>
{
if (UseWorker)
{
using (var worker = workerServiceFactory.Create())
{
worker.Callback.ImageCallback += (img, tempPath) =>
{
if (tempPath != null)
{
scannedImageHelper.RunBackgroundOcr(img, ScanParams, tempPath);
}
source.Put(img);
};
CancelToken.Register(worker.Service.CancelTwainScan);
await worker.Service.TwainScan(ScanDevice, ScanProfile, ScanParams, DialogParent?.SafeHandle() ?? IntPtr.Zero);
}
}
else
{
twainWrapper.Scan(DialogParent, ScanDevice, ScanProfile, ScanParams, CancelToken, source, scannedImageHelper.RunBackgroundOcr);
}
}, TaskCreationOptions.LongRunning).Unwrap();
}
protected override async Task ScanInternal(ScannedImageSource.Concrete source)
{
using (var eventLoop = new WiaBackgroundEventLoop(ScanProfile, ScanDevice))
{
bool supportsFeeder = eventLoop.GetSync(wia => WiaApi.DeviceSupportsFeeder(wia.Device));
if (ScanProfile.PaperSource != ScanSource.Glass && !supportsFeeder)
{
throw new NoFeederSupportException();
}
bool supportsDuplex = eventLoop.GetSync(wia => WiaApi.DeviceSupportsDuplex(wia.Device));
if (ScanProfile.PaperSource == ScanSource.Duplex && !supportsDuplex)
{
throw new NoDuplexSupportException();
}
int pageNumber = 1;
int retryCount = 0;
bool retry = false;
bool done = false;
do
{
ScannedImage image;
try
{
if (pageNumber > 1 && ScanProfile.WiaDelayBetweenScans)
{
int delay = (int)(ScanProfile.WiaDelayBetweenScansSeconds.Clamp(0, 30) * 1000);
Thread.Sleep(delay);
}
(image, done) = await TransferImage(eventLoop, pageNumber);
pageNumber++;
retryCount = 0;
retry = false;
}
catch (ScanDriverException e)
{
if (ScanProfile.WiaRetryOnFailure && e.InnerException is COMException comError &&
(uint)comError.ErrorCode == 0x80004005 && retryCount < MAX_RETRIES)
{
Thread.Sleep(1000);
retryCount += 1;
retry = true;
continue;
}
throw;
}
if (image != null)
{
source.Put(image);
}
} while (!CancelToken.IsCancellationRequested && (retry || !done && ScanProfile.PaperSource != ScanSource.Glass));
}
}
public ScannedImageSource Scan()
{
var source = new ScannedImageSource.Concrete();
Task.Factory.StartNew(() =>
{
for (int i = 0; i < ImageCount; i++)
{
Thread.Sleep(500);
source.Put(MakeImage());
}
}, TaskCreationOptions.LongRunning);
return(source);
}
protected override async Task ScanInternal(ScannedImageSource.Concrete source)
{
// TODO: Test ADF
var options = new Lazy <KeyValueScanOptions>(GetOptions);
var pageNumber = 1;
var(img, done) = await Transfer(options, pageNumber);
if (img != null)
{
source.Put(img);
}
if (!done && ScanProfile.PaperSource != ScanSource.Glass)
{
try
{
while (true)
{
(img, done) = await Transfer(options, ++pageNumber);
if (done)
{
break;
}
if (img != null)
{
source.Put(img);
}
}
}
catch (Exception e)
{
Log.ErrorException("Error in SANE. This may be a normal ADF termination.", e);
}
}
}
protected override async Task ScanInternal(ScannedImageSource.Concrete source)
{
await Task.Factory.StartNew(async() =>
{
if (UseWorker)
{
var parentHandle = DialogParent?.SafeHandle() ?? IntPtr.Zero;
try
{
using (var worker = workerServiceFactory.Create())
{
worker.Callback.ImageCallback += (img, tempPath) =>
{
if (tempPath != null)
{
scannedImageHelper.RunBackgroundOcr(img, ScanParams, tempPath);
}
source.Put(img);
};
CancelToken.Register(worker.Service.CancelTwainScan);
await worker.Service.TwainScan(ScanDevice, ScanProfile, ScanParams, parentHandle);
}
}
finally
{
if (parentHandle != IntPtr.Zero)
{
// If the worker process hard crashes while a modal window is open, it may leave the parent
// window in a state where it can't be interacted with. This fixes that interaction.
//
// At the Windows API level, a modal window is implemented by doing two things:
// 1. Setting the parent on the child window
// 2. Disabling the parent window
// The first is implicitly undone when the worker process dies. The second is undone here.
Win32.EnableWindow(parentHandle, true);
}
}
}
else
{
twainWrapper.Scan(DialogParent, ScanDevice, ScanProfile, ScanParams, CancelToken, source, scannedImageHelper.RunBackgroundOcr);
}
}, TaskCreationOptions.LongRunning).Unwrap();
}
private void ProduceImage(ScannedImageSource.Concrete source, Image output, ref int pageNumber)
{
var results = new[] { scannedImageHelper.PostProcessStep1(output, ScanProfile) };
if (ScanProfile.DivideScanIntoTwoPages)
{
var result = results[0];
// Should probably detect portrait vs landscape and split appropriately but this is the
// main use case.
var halfHeight = result.Height / 2;
var firstRect = new Rectangle(0, 0, result.Width, halfHeight);
var secondRect = new Rectangle(0, halfHeight, result.Width, halfHeight);
var firstPage = result.Clone(secondRect, result.PixelFormat);
firstPage.RotateFlip(RotateFlipType.Rotate90FlipNone);
var secondPage = result.Clone(firstRect, result.PixelFormat);
secondPage.RotateFlip(RotateFlipType.Rotate90FlipNone);
results = new[] { firstPage, secondPage };
result.Dispose();
}
foreach (var result in results)
{
if (blankDetector.ExcludePage(result, ScanProfile))
{
continue;
}
ScanBitDepth bitDepth = ScanProfile.UseNativeUI ? ScanBitDepth.C24Bit : ScanProfile.BitDepth;
var image = new ScannedImage(result, bitDepth, ScanProfile.MaxQuality, ScanProfile.Quality);
scannedImageHelper.PostProcessStep2(image, result, ScanProfile, ScanParams, pageNumber);
string tempPath = scannedImageHelper.SaveForBackgroundOcr(result, ScanParams);
result.Dispose();
scannedImageHelper.RunBackgroundOcr(image, ScanParams, tempPath);
source.Put(image);
pageNumber++;
InitNextPageProgress(pageNumber);
}
}
private void ProduceImage(ScannedImageSource.Concrete source, Image output, ref int pageNumber)
{
using (var result = scannedImageHelper.PostProcessStep1(output, ScanProfile))
{
if (blankDetector.ExcludePage(result, ScanProfile))
{
return;
}
ScanBitDepth bitDepth = ScanProfile.UseNativeUI ? ScanBitDepth.C24Bit : ScanProfile.BitDepth;
var image = new ScannedImage(result, bitDepth, ScanProfile.MaxQuality, ScanProfile.Quality);
scannedImageHelper.PostProcessStep2(image, result, ScanProfile, ScanParams, pageNumber);
string tempPath = scannedImageHelper.SaveForBackgroundOcr(result, ScanParams);
scannedImageHelper.RunBackgroundOcr(image, ScanParams, tempPath);
source.Put(image);
pageNumber++;
InitNextPageProgress(pageNumber);
}
}
public static void Scan(ScanProfile settings, ScanDevice device, IWin32Window pForm, IFormFactory formFactory, ScannedImageSource.Concrete source)
{
var tw = new Twain();
if (!tw.Init(pForm.Handle))
{
throw new DeviceNotFoundException();
}
if (!tw.SelectByName(device.ID))
{
throw new DeviceNotFoundException();
}
var form = formFactory.Create <FTwainGui>();
var mf = new TwainMessageFilter(settings, tw, form);
form.ShowDialog(pForm);
foreach (var b in mf.Bitmaps)
{
source.Put(b);
}
}
public static void Scan(ScanProfile settings, ScanDevice device, IWin32Window pForm, IFormFactory formFactory, ScannedImageSource.Concrete source)
{
var tw = new Twain();
var windowHandle = (Invoker.Current as Form)?.Handle ?? pForm.Handle;
if (!tw.Init(windowHandle))
{
throw new DeviceNotFoundException();
}
if (!tw.SelectByName(device.Id))
{
throw new DeviceNotFoundException();
}
var form = Invoker.Current.InvokeGet(formFactory.Create <FTwainGui>);
var mf = new TwainMessageFilter(settings, tw, form);
Invoker.Current.Invoke(() => form.ShowDialog(pForm));
foreach (var b in mf.Bitmaps)
{
source.Put(b);
}
}
public ScannedImageSource Import(string filePath, ImportParams importParams, ProgressHandler progressCallback, CancellationToken cancelToken)
{
var source = new ScannedImageSource.Concrete();
Task.Factory.StartNew(() =>
{
try
{
if (cancelToken.IsCancellationRequested)
{
source.Done();
return;
}
Bitmap toImport;
try
{
toImport = new Bitmap(filePath);
}
catch (Exception e)
{
Log.ErrorException("Error importing image: " + filePath, e);
// Handle and notify the user outside the method so that errors importing multiple files can be aggregated
throw;
}
using (toImport)
{
int frameCount = toImport.GetFrameCount(FrameDimension.Page);
int i = 0;
foreach (var frameIndex in importParams.Slice.Indices(frameCount))
{
progressCallback(i++, frameCount);
if (cancelToken.IsCancellationRequested)
{
source.Done();
return;
}
toImport.SelectActiveFrame(FrameDimension.Page, frameIndex);
var image = new ScannedImage(toImport, ScanBitDepth.C24Bit, IsLossless(toImport.RawFormat), -1);
if (!importParams.NoThumbnails)
{
image.SetThumbnail(thumbnailRenderer.RenderThumbnail(toImport));
}
if (importParams.DetectPatchCodes)
{
image.PatchCode = PatchCodeDetector.Detect(toImport);
}
source.Put(image);
}
progressCallback(frameCount, frameCount);
}
source.Done();
}
catch (Exception e)
{
source.Error(e);
}
}, TaskCreationOptions.LongRunning);
return(source);
}
public ScannedImageSource Import(string filePath, ImportParams importParams, ProgressHandler progressCallback, CancellationToken cancelToken)
{
var source = new ScannedImageSource.Concrete();
Task.Factory.StartNew(async() =>
{
if (cancelToken.IsCancellationRequested)
{
source.Done();
}
int passwordAttempts = 0;
bool aborted = false;
int i = 0;
try
{
PdfDocument document = PdfReader.Open(filePath, PdfDocumentOpenMode.Import, args =>
{
if (!pdfPasswordProvider.ProvidePassword(Path.GetFileName(filePath), passwordAttempts++, out args.Password))
{
args.Abort = true;
aborted = true;
}
});
if (passwordAttempts > 0 &&
!document.SecuritySettings.HasOwnerPermissions &&
!document.SecuritySettings.PermitExtractContent)
{
errorOutput.DisplayError(string.Format(MiscResources.PdfNoPermissionToExtractContent, Path.GetFileName(filePath)));
source.Done();
}
var pages = importParams.Slice.Indices(document.PageCount)
.Select(index => document.Pages[index])
.TakeWhile(page =>
{
progressCallback(i++, document.PageCount);
return(!cancelToken.IsCancellationRequested);
});
if (document.Info.Creator != MiscResources.NAPS2 && document.Info.Author != MiscResources.NAPS2)
{
pdfRenderer.ThrowIfCantRender();
foreach (var page in pages)
{
source.Put(await ExportRawPdfPage(page, importParams));
}
}
else
{
foreach (var page in pages)
{
await GetImagesFromPage(page, importParams, source);
}
}
}
catch (ImageRenderException e)
{
errorOutput.DisplayError(string.Format(MiscResources.ImportErrorNAPS2Pdf, Path.GetFileName(filePath)));
Log.ErrorException("Error importing PDF file.", e);
}
catch (Exception e)
{
if (!aborted)
{
errorOutput.DisplayError(string.Format(MiscResources.ImportErrorCouldNot, Path.GetFileName(filePath)));
Log.ErrorException("Error importing PDF file.", e);
}
}
finally
{
source.Done();
}
}, TaskCreationOptions.LongRunning);
return(source);
}
private void InternalScan(TwainImpl twainImpl, IWin32Window dialogParent, ScanDevice scanDevice, ScanProfile scanProfile, ScanParams scanParams,
CancellationToken cancelToken, ScannedImageSource.Concrete source, Action <ScannedImage, ScanParams, string> runBackgroundOcr)
{
if (dialogParent == null)
{
dialogParent = new BackgroundForm();
}
if (twainImpl == TwainImpl.Legacy)
{
Legacy.TwainApi.Scan(scanProfile, scanDevice, dialogParent, formFactory, source);
return;
}
PlatformInfo.Current.PreferNewDSM = twainImpl != TwainImpl.OldDsm;
var session = new TwainSession(TwainAppId);
var twainForm = Invoker.Current.InvokeGet(() => scanParams.NoUI ? null : formFactory.Create <FTwainGui>());
Exception error = null;
bool cancel = false;
DataSource ds = null;
var waitHandle = new AutoResetEvent(false);
int pageNumber = 0;
session.TransferReady += (sender, eventArgs) =>
{
Debug.WriteLine("NAPS2.TW - TransferReady");
if (cancel)
{
eventArgs.CancelAll = true;
}
};
session.DataTransferred += (sender, eventArgs) =>
{
try
{
Debug.WriteLine("NAPS2.TW - DataTransferred");
pageNumber++;
using (var output = twainImpl == TwainImpl.MemXfer
? GetBitmapFromMemXFer(eventArgs.MemoryData, eventArgs.ImageInfo)
: Image.FromStream(eventArgs.GetNativeImageStream()))
{
using (var result = scannedImageHelper.PostProcessStep1(output, scanProfile))
{
if (blankDetector.ExcludePage(result, scanProfile))
{
return;
}
var bitDepth = output.PixelFormat == PixelFormat.Format1bppIndexed
? ScanBitDepth.BlackWhite
: ScanBitDepth.C24Bit;
var image = new ScannedImage(result, bitDepth, scanProfile.MaxQuality, scanProfile.Quality);
if (scanParams.DetectPatchCodes)
{
foreach (var patchCodeInfo in eventArgs.GetExtImageInfo(ExtendedImageInfo.PatchCode))
{
if (patchCodeInfo.ReturnCode == ReturnCode.Success)
{
image.PatchCode = GetPatchCode(patchCodeInfo);
}
}
}
scannedImageHelper.PostProcessStep2(image, result, scanProfile, scanParams, pageNumber);
string tempPath = scannedImageHelper.SaveForBackgroundOcr(result, scanParams);
runBackgroundOcr(image, scanParams, tempPath);
source.Put(image);
}
}
}
catch (Exception ex)
{
Debug.WriteLine("NAPS2.TW - DataTransferred - Error");
error = ex;
cancel = true;
StopTwain();
}
};
session.TransferError += (sender, eventArgs) =>
{
Debug.WriteLine("NAPS2.TW - TransferError");
if (eventArgs.Exception != null)
{
error = eventArgs.Exception;
}
else if (eventArgs.SourceStatus != null)
{
Log.Error("TWAIN Transfer Error. Return code = {0}; condition code = {1}; data = {2}.",
eventArgs.ReturnCode, eventArgs.SourceStatus.ConditionCode, eventArgs.SourceStatus.Data);
}
else
{
Log.Error("TWAIN Transfer Error. Return code = {0}.", eventArgs.ReturnCode);
}
cancel = true;
StopTwain();
};
session.SourceDisabled += (sender, eventArgs) =>
{
Debug.WriteLine("NAPS2.TW - SourceDisabled");
StopTwain();
};
void StopTwain()
{
waitHandle.Set();
if (!scanParams.NoUI)
{
Invoker.Current.Invoke(() => twainForm.Close());
}
}
void InitTwain()
{
try
{
var windowHandle = (Invoker.Current as Form)?.Handle;
ReturnCode rc = windowHandle != null?session.Open(new WindowsFormsMessageLoopHook(windowHandle.Value)) : session.Open();
if (rc != ReturnCode.Success)
{
Debug.WriteLine("NAPS2.TW - Could not open session - {0}", rc);
StopTwain();
return;
}
ds = session.FirstOrDefault(x => x.Name == scanDevice.ID);
if (ds == null)
{
Debug.WriteLine("NAPS2.TW - Could not find DS - DS count = {0}", session.Count());
throw new DeviceNotFoundException();
}
rc = ds.Open();
if (rc != ReturnCode.Success)
{
Debug.WriteLine("NAPS2.TW - Could not open DS - {0}", rc);
StopTwain();
return;
}
ConfigureDS(ds, scanProfile, scanParams);
var ui = scanProfile.UseNativeUI ? SourceEnableMode.ShowUI : SourceEnableMode.NoUI;
Debug.WriteLine("NAPS2.TW - Enabling DS");
rc = scanParams.NoUI ? ds.Enable(ui, true, windowHandle ?? IntPtr.Zero) : ds.Enable(ui, true, twainForm.Handle);
Debug.WriteLine("NAPS2.TW - Enable finished");
if (rc != ReturnCode.Success)
{
Debug.WriteLine("NAPS2.TW - Enable failed - {0}, rc");
StopTwain();
}
else
{
cancelToken.Register(() =>
{
Debug.WriteLine("NAPS2.TW - User Cancel");
cancel = true;
session.ForceStepDown(5);
});
}
}
catch (Exception ex)
{
Debug.WriteLine("NAPS2.TW - Error");
error = ex;
StopTwain();
}
}
if (!scanParams.NoUI)
{
twainForm.Shown += (sender, eventArgs) => { InitTwain(); };
twainForm.Closed += (sender, args) => waitHandle.Set();
}
if (scanParams.NoUI)
{
Debug.WriteLine("NAPS2.TW - Init with no form");
Invoker.Current.Invoke(InitTwain);
}
else if (!scanParams.Modal)
{
Debug.WriteLine("NAPS2.TW - Init with non-modal form");
Invoker.Current.Invoke(() => twainForm.Show(dialogParent));
}
else
{
Debug.WriteLine("NAPS2.TW - Init with modal form");
Invoker.Current.Invoke(() => twainForm.ShowDialog(dialogParent));
}
waitHandle.WaitOne();
Debug.WriteLine("NAPS2.TW - Operation complete");
if (ds != null && session.IsSourceOpen)
{
Debug.WriteLine("NAPS2.TW - Closing DS");
ds.Close();
}
if (session.IsDsmOpen)
{
Debug.WriteLine("NAPS2.TW - Closing session");
session.Close();
}
if (error != null)
{
Debug.WriteLine("NAPS2.TW - Throwing error - {0}", error);
if (error is ScanDriverException)
{
throw error;
}
throw new ScanDriverUnknownException(error);
}
}
protected override Task ScanInternal(ScannedImageSource.Concrete source)
{
if (ScanProfile.ProxyConfig == null)
{
throw new InvalidOperationException("ScanProfile.ProxyConfig must be specified to use ProxiedScanDriver.");
}
return(Task.Factory.StartNew(async() =>
{
try
{
using (var client = clientContextFactory.Create(ScanProfile.ProxyConfig))
{
var noUi = ScanParams.NoUi;
var form = Invoker.Current.InvokeGet(() => noUi ? null : formFactory.Create <FScanProgress>());
var pageNumber = 1;
var sem = new Semaphore(0, int.MaxValue);
client.Callback.ImageCallback += (imageBytes, indexImage) =>
{
try
{
indexImage.FileName = RecoveryImage.GetNextFileName() + Path.GetExtension(indexImage.FileName);
var recoveryFilePath = Path.Combine(RecoveryImage.RecoveryFolder.FullName, indexImage.FileName);
File.WriteAllBytes(recoveryFilePath, imageBytes);
var image = new ScannedImage(indexImage);
using (var bitmap = new Bitmap(new MemoryStream(imageBytes)))
{
scannedImageHelper.PostProcessStep2(image, bitmap, ScanProfile, ScanParams, pageNumber++, false);
}
source.Put(image);
if (form != null)
{
form.PageNumber = pageNumber;
Invoker.Current.SafeInvoke(() => form.RefreshStatus());
}
}
finally
{
sem.Release();
}
};
var scanTask = client.Service.Scan(ScanProfile, ScanParams).ContinueWith(t =>
{
for (var i = 0; i < t.Result; i++)
{
sem.WaitOne();
}
});
if (!noUi)
{
form.PageNumber = pageNumber;
form.AsyncTransfer = async() => await scanTask;
form.CancelToken.Register(client.Service.CancelScan);
}
CancelToken.Register(client.Service.CancelScan);
if (noUi)
{
await scanTask;
}
else if (ScanParams.Modal)
{
Invoker.Current.SafeInvoke(() => form.ShowDialog());
}
else
{
Invoker.Current.SafeInvoke(() => form.Show());
await scanTask;
}
}
}
catch (Exception e)
{
Log.ErrorException("Error scanning with proxy", e);
}
}, TaskCreationOptions.LongRunning).Unwrap());
}
