private void DoTransfer(ScannedImageSource.Concrete source, WiaDevice device, WiaItem item)
{
if (ScanProfile.PaperSource != ScanSource.Glass && !device.SupportsFeeder())
{
throw new NoFeederSupportException();
}
if (ScanProfile.PaperSource == ScanSource.Duplex && !device.SupportsDuplex())
{
throw new NoDuplexSupportException();
}
InitProgress(device);
ConfigureProps(device, item);
using (var transfer = item.StartTransfer())
{
int pageNumber = 1;
transfer.PageScanned += (sender, args) =>
{
try
{
using (args.Stream)
{
if (args.Stream.Length == 0)
{
return;
}
using (var output = Image.FromStream(args.Stream))
{
ProduceImage(source, output, ref pageNumber);
}
}
}
catch (Exception e)
{
ScanException = e;
}
};
transfer.Progress += (sender, args) => smoothProgress.InputProgressChanged(args.Percent / 100.0);
using (CancelToken.Register(transfer.Cancel))
{
transfer.Download();
if (device.Version == WiaVersion.Wia10 && ScanProfile.PaperSource != ScanSource.Glass)
{
// For WIA 1.0 feeder scans, we need to repeatedly call Download until WIA_ERROR_PAPER_EMPTY is received.
try
{
while (!CancelToken.IsCancellationRequested)
{
transfer.Download();
}
}
catch (WiaException e) when(e.ErrorCode == WiaErrorCodes.PAPER_EMPTY)
{
}
}
}
}
}
