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();
}
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();
}