private ScannedImage TransferImage(WiaBackgroundEventLoop eventLoop, int pageNumber, out bool cancel)
{
try
{
var transfer = ScanParams.NoUI ? backgroundWiaTransfer : foregroundWiaTransfer;
ChaosMonkey.MaybeError(0, new COMException("Fail", -2147467259));
using (var stream = transfer.Transfer(pageNumber, eventLoop, WiaApi.Formats.BMP))
{
if (stream == null)
{
cancel = true;
return(null);
}
cancel = false;
using (Image output = Image.FromStream(stream))
{
using (var result = scannedImageHelper.PostProcessStep1(output, ScanProfile))
{
if (blankDetector.ExcludePage(result, ScanProfile))
{
return(null);
}
ScanBitDepth bitDepth = ScanProfile.UseNativeUI ? ScanBitDepth.C24Bit : ScanProfile.BitDepth;
var image = new ScannedImage(result, bitDepth, ScanProfile.MaxQuality, ScanProfile.Quality);
image.SetThumbnail(thumbnailRenderer.RenderThumbnail(result));
scannedImageHelper.PostProcessStep2(image, result, ScanProfile, ScanParams, pageNumber);
return(image);
}
}
}
}
catch (NoPagesException)
{
if (ScanProfile.PaperSource != ScanSource.Glass && pageNumber == 1)
{
// No pages were in the feeder, so show the user an error
throw new NoPagesException();
}
// At least one page was scanned but now the feeder is empty, so exit normally
cancel = true;
return(null);
}
catch (ScanDriverException)
{
throw;
}
catch (Exception e)
{
throw new ScanDriverUnknownException(e);
}
}
private async Task <(ScannedImage, bool)> TransferImage(WiaBackgroundEventLoop eventLoop, int pageNumber)
{
return(await Task.Factory.StartNew(() =>
{
try
{
ChaosMonkey.MaybeError(0, new COMException("Fail", -2147467259));
using (var stream = DoTransfer(pageNumber, eventLoop, WiaApi.Formats.BMP))
{
if (stream == null)
{
return (null, true);
}
using (Image output = Image.FromStream(stream))
{
using (var result = scannedImageHelper.PostProcessStep1(output, ScanProfile))
{
if (blankDetector.ExcludePage(result, ScanProfile))
{
return (null, false);
}
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);
return (image, false);
}
}
}
}
catch (NoPagesException)
{
if (ScanProfile.PaperSource != ScanSource.Glass && pageNumber == 1)
{
// No pages were in the feeder, so show the user an error
throw new NoPagesException();
}
// At least one page was scanned but now the feeder is empty, so exit normally
return (null, true);
}
}, TaskCreationOptions.LongRunning));
}
