public async Task DetectScanner(string message)
{
try
{
_logger.LogInformation(message);
var scanners = SystemDevices.GetScannerDevices();
_firstScanner = scanners.FirstOrDefault();
if (_firstScanner == null)
{
await _hubClient.CallScannerIsNotConnectedError();
return;
}
_logger.LogInformation($"{_firstScanner}");
await _hubClient.CallGetScannerSettings(_firstScanner);
}
catch (COMException ex)
{
var friendlyErrorMessage = ex.GetComErrorMessage(); // How to show a better error message to users
_logger.LogError(ex, friendlyErrorMessage);
await _hubClient.CallGetErrors(friendlyErrorMessage);
}
catch (Exception ex)
{
_logger.LogError(ex, "DetectScanner error.");
await _hubClient.CallGetErrors(ex.Message);
}
}
static void Main(string[] args)
{
try
{
// Finding the first connected scanner to the system
var scanners = SystemDevices.GetScannerDevices();
var firstScanner = scanners.FirstOrDefault();
if (firstScanner == null)
{
Console.WriteLine("Please connect your scanner to the system and also make sure its driver is installed.");
return;
}
Console.WriteLine($"Using {firstScanner}");
using (var scannerDevice = new ScannerDevice(firstScanner))
{
scannerDevice.ScannerPictureSettings(config =>
{
config.ColorFormat(ColorType.Color)
// Optional settings
.Resolution(200)
.Brightness(1)
.Contrast(1)
.StartPosition(left: 0, top: 0)
//.Extent(width: 1250 * dpi, height: 1700 * dpi)
;
});
// If your scanner is a duplex or automatic document feeder, set these options
scannerDevice.ScannerDeviceSettings(config =>
{
// config.Source(DocumentSource.DoubleSided);
// ...
});
scannerDevice.PerformScan(WiaImageFormat.Jpeg);
// An optional post processing of scanned images.
// At least using its `Compress` method is recommended!
scannerDevice.ProcessScannedImages(process =>
{
process.ScaleByPixels(maximumWidth: 1000, maximumHeight: 1000, preserveAspectRatio: true)
.CropByPixels(left: 10, top: 10, right: 10, bottom: 10)
.RotateFlip(rotationAngle: 90, flipHorizontal: false, flipVertical: false)
.Compress(quality: 90);
});
var fileName = Path.Combine(Directory.GetCurrentDirectory(), "test.jpg");
foreach (var file in scannerDevice.SaveScannedImageFiles(fileName))
{
Console.WriteLine($"Saved image file to: {file}");
}
// Or you can access the scanned images bytes
foreach (var fileBytes in scannerDevice.ExtractScannedImageFiles())
{
// You can convert them to Image objects
// var img = Image.FromStream(new MemoryStream(fileBytes));
Console.WriteLine($"fileBytes len: {fileBytes.Length}");
File.WriteAllBytes(Path.Combine(Directory.GetCurrentDirectory(), "test2.jpg"), fileBytes);
}
}
}
catch (COMException ex)
{
var friendlyErrorMessage = ex.GetComErrorMessage(); // How to show a better error message to users
Console.WriteLine(friendlyErrorMessage);
Console.WriteLine(ex);
}
}