/// <summary>
/// Previews the image from the scanner with given device id
/// The preview is allowed only if the selected scanner is equipped with a Flatbed and supports preview.
/// </summary>
/// <param name="deviceId">scanner device id</param>
/// <param name="stream">RandomAccessStream in which preview given the by the scan runtime API is kept</param>
public async void ScanPreview(string deviceId, IRandomAccessStream stream)
{
try
{
// Get the scanner object for this device id
ImageScanner myScanner = await ImageScanner.FromIdAsync(deviceId);
if (myScanner.IsScanSourceSupported(ImageScannerScanSource.Flatbed))
{
if (myScanner.IsPreviewSupported(ImageScannerScanSource.Flatbed))
{
rootPage.NotifyUser("Scanning", NotifyType.StatusMessage);
// Scan API call to get preview from the flatbed
var result = await myScanner.ScanPreviewToStreamAsync(ImageScannerScanSource.Flatbed, stream);
if (result.Succeeded)
{
Utils.SetImageSourceFromStream(stream, DisplayImage);
rootPage.NotifyUser("Preview scanning is complete. Below is the preview image.", NotifyType.StatusMessage);
}
else
{
rootPage.NotifyUser("Failed to preview from Flatbed.", NotifyType.ErrorMessage);
}
}
else
{
rootPage.NotifyUser("The selected scanner does not support preview from Flatbed.", NotifyType.ErrorMessage);
}
}
else
{
rootPage.NotifyUser("The selected scanner does not report to be equipped with a Flatbed.", NotifyType.ErrorMessage);
}
}
catch (Exception ex)
{
Utils.DisplayExceptionErrorMessage(ex);
}
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// CONSTRUCTORS / FACTORIES /////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
public DiscoveredScanner(ImageScanner device, string name)
{
Device = device;
Id = Device.DeviceId;
Name = name;
try
{
IsAutoAllowed = device.IsScanSourceSupported(ImageScannerScanSource.AutoConfigured);
IsFeederAllowed = device.IsScanSourceSupported(ImageScannerScanSource.Feeder);
IsFlatbedAllowed = device.IsScanSourceSupported(ImageScannerScanSource.Flatbed);
}
catch (Exception exc)
{
LogService.Log.Error(exc, "DiscoveredScanner: Couldn't determine supported scan sources.");
throw;
}
// auto mode
if (IsAutoAllowed)
{
LogService.Log.Information("DiscoveredScanner: Processing auto mode");
IsAutoPreviewAllowed = device.IsPreviewSupported(ImageScannerScanSource.AutoConfigured);
AutoFormats = GenerateFormats(device.AutoConfiguration);
}
// flatbed mode
if (IsFlatbedAllowed)
{
LogService.Log.Information("DiscoveredScanner: Processing flatbed mode");
IsFlatbedColorAllowed = device.FlatbedConfiguration.IsColorModeSupported(ImageScannerColorMode.Color);
IsFlatbedGrayscaleAllowed = device.FlatbedConfiguration.IsColorModeSupported(ImageScannerColorMode.Grayscale);
IsFlatbedMonochromeAllowed = device.FlatbedConfiguration.IsColorModeSupported(ImageScannerColorMode.Monochrome);
IsFlatbedAutoColorAllowed = device.FlatbedConfiguration.IsColorModeSupported(ImageScannerColorMode.AutoColor);
if (!IsFlatbedColorAllowed && !IsFlatbedGrayscaleAllowed && !IsFlatbedMonochromeAllowed && !IsFlatbedAutoColorAllowed)
{
// no color mode allowed, source mode is invalid
IsFlatbedAllowed = false;
LogService.Log.Warning("DiscoveredScanner: No color mode for flatbed allowed, invalid source mode");
}
else
{
LogService.Log.Information("DiscoveredScanner: Flatbed supports at least one color mode");
try
{
IsFlatbedPreviewAllowed = device.IsPreviewSupported(ImageScannerScanSource.Flatbed);
}
catch (Exception exc)
{
LogService.Log.Error(exc, "DiscoveredScanner: Couldn't determine preview support for flatbed.");
throw;
}
try
{
IsFlatbedAutoCropSingleRegionAllowed = device.FlatbedConfiguration
.IsAutoCroppingModeSupported(ImageScannerAutoCroppingMode.SingleRegion);
IsFlatbedAutoCropMultiRegionAllowed = device.FlatbedConfiguration
.IsAutoCroppingModeSupported(ImageScannerAutoCroppingMode.MultipleRegion);
}
catch (Exception exc)
{
LogService.Log.Error(exc, "DiscoveredScanner: Couldn't determine auto crop support for flatbed.");
throw;
}
FlatbedResolutions = GenerateResolutions(device.FlatbedConfiguration);
LogService.Log.Information("Generated {@Resolutions} for flatbed.", FlatbedResolutions);
FlatbedFormats = GenerateFormats(device.FlatbedConfiguration);
LogService.Log.Information("Generated {@Formats} for feeder.", FlatbedFormats);
try
{
if (device.FlatbedConfiguration.BrightnessStep != 0)
{
FlatbedBrightnessConfig = GenerateBrightnessConfig(device.FlatbedConfiguration);
}
}
catch (Exception exc)
{
LogService.Log.Error(exc, "DiscoveredScanner: Couldn't determine BrightnessConfig for flatbed.");
throw;
}
try
{
if (device.FlatbedConfiguration.ContrastStep != 0)
{
FlatbedContrastConfig = GenerateContrastConfig(device.FlatbedConfiguration);
}
}
catch (Exception exc)
{
LogService.Log.Error(exc, "DiscoveredScanner: Couldn't determine ContrastConfig for flatbed.");
throw;
}
}
}
// feeder mode
if (IsFeederAllowed)
{
LogService.Log.Information("DiscoveredScanner: Processing feeder mode");
IsFeederColorAllowed = device.FeederConfiguration.IsColorModeSupported(ImageScannerColorMode.Color);
IsFeederGrayscaleAllowed = device.FeederConfiguration.IsColorModeSupported(ImageScannerColorMode.Grayscale);
IsFeederMonochromeAllowed = device.FeederConfiguration.IsColorModeSupported(ImageScannerColorMode.Monochrome);
IsFeederAutoColorAllowed = device.FeederConfiguration.IsColorModeSupported(ImageScannerColorMode.AutoColor);
if (!IsFeederColorAllowed && !IsFeederGrayscaleAllowed && !IsFeederMonochromeAllowed && !IsFeederAutoColorAllowed)
{
// no color mode allowed, source mode is invalid
IsFeederAllowed = false;
LogService.Log.Warning("DiscoveredScanner: No color mode for feeder allowed, invalid source mode");
}
else
{
LogService.Log.Information("DiscoveredScanner: Feeder supports at least one color mode");
try
{
IsFeederDuplexAllowed = device.FeederConfiguration.CanScanDuplex;
}
catch (Exception exc)
{
LogService.Log.Error(exc, "DiscoveredScanner: Couldn't determine duplex support for feeder.");
throw;
}
try
{
IsFeederPreviewAllowed = device.IsPreviewSupported(ImageScannerScanSource.Feeder);
}
catch (Exception exc)
{
LogService.Log.Error(exc, "DiscoveredScanner: Couldn't determine preview support for feeder.");
throw;
}
try
{
IsFeederAutoCropSingleRegionAllowed = device.FeederConfiguration
.IsAutoCroppingModeSupported(ImageScannerAutoCroppingMode.SingleRegion);
IsFeederAutoCropMultiRegionAllowed = device.FeederConfiguration
.IsAutoCroppingModeSupported(ImageScannerAutoCroppingMode.MultipleRegion);
}
catch (Exception exc)
{
LogService.Log.Error(exc, "DiscoveredScanner: Couldn't determine auto crop support for feeder.");
throw;
}
FeederResolutions = GenerateResolutions(device.FeederConfiguration);
LogService.Log.Information("Generated {@Resolutions} for feeder.", FeederResolutions);
FeederFormats = GenerateFormats(device.FeederConfiguration);
LogService.Log.Information("Generated {@Formats} for feeder.", FeederFormats);
try
{
if (device.FeederConfiguration.BrightnessStep != 0)
{
FeederBrightnessConfig = GenerateBrightnessConfig(device.FeederConfiguration);
}
}
catch (Exception exc)
{
LogService.Log.Error(exc, "DiscoveredScanner: Couldn't determine BrightnessConfig for feeder.");
throw;
}
try
{
if (device.FeederConfiguration.ContrastStep != 0)
{
FeederContrastConfig = GenerateContrastConfig(device.FeederConfiguration);
}
}
catch (Exception exc)
{
LogService.Log.Error(exc, "DiscoveredScanner: Couldn't determine ContrastConfig for feeder.");
throw;
}
}
}
if (!IsAutoAllowed && !IsFlatbedAllowed && !IsFeederAllowed)
{
// no source mode allowed, scanner is invalid and useless
throw new ArgumentException("Scanner doesn't support any source mode and can't be used.");
}
LogService.Log.Information("Created {@DiscoveredScanner}", this);
}
