private void bckScanFinger_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker bck = (BackgroundWorker)sender;
try
{
int i;
NDeviceManager devMan = new NDeviceManager(NDeviceType.FingerScanner, true, false);
int count = devMan.Devices.Count;
//See if a fingerprint scanner is connected
if (count > 0)
{
//What if there is more than one scanner
}
else
{
GlobalScanStatus = ScanStatus.NoScanner;
}
if (count > 1)
//What if there is more than one scanner. We will use the first detected scanner.
for (i = 0; i < count; i++)
{
NDevice device = devMan.Devices[i];
}
i = 0;
NFScanner fingerScanner = (NFScanner)devMan.Devices[i];
NFExtractor extractor = new NFExtractor();
NFRecord record;
extractor.ReturnedImage = NfeReturnedImage.Binarized;
NImage image = null;
while (image == null && !bckScanFinger.CancellationPending)
{
if (bck.CancellationPending)
{
e.Cancel = true;
}
else
{
using ( image = fingerScanner.Capture(5000))
{
if (image == null)
{
GlobalScanStatus = ScanStatus.NoTemplateCreated;
}
else
{
NfeExtractionStatus extractionStatus;
using (NGrayscaleImage grayscaleImage = image.ToGrayscale())
{
if (grayscaleImage.ResolutionIsAspectRatio
|| grayscaleImage.HorzResolution < 250
|| grayscaleImage.VertResolution < 250)
{
grayscaleImage.HorzResolution = 500;
grayscaleImage.VertResolution = 500;
grayscaleImage.ResolutionIsAspectRatio = false;
}
record = extractor.Extract(grayscaleImage, NFPosition.Unknown, NFImpressionType.LiveScanPlain, out extractionStatus);
fingerprintImage = (NImage)image.Clone();
fingerprintImage = NImages.GetGrayscaleColorWrapper(fingerprintImage, resultImageMinColor, resultImageMaxColor);
}
if (extractionStatus == NfeExtractionStatus.TemplateCreated)
{
GlobalScanStatus = ScanStatus.TemplateCreated;
fingerprintTemplate = record;
ScannedTemplated = true;
bck.ReportProgress(1);
}
}
}
}
}
}
catch (Exception ex)
{
ScanError = ex.Message;
}
GlobalScanStatus = ScanStatus.Cancelled;
}
private void Scanner_ImageScanned(object sender, FPScannerImageScannedEventArgs ea)
{
//the lock is used to prevent a race condition
//if a template is captured, capturing is set to false
//a new call to StartCapturing is required in order to get the next template
lock (_locker)
{
if (_isCapturing)
{
NfeExtractionStatus status;
Template template = null;
try
{
NFExtractor extractor = new NFExtractor();
NFRecord record = extractor.Extract(ea.Image, NFPosition.Unknown, NFImpressionType.LiveScanPlain, out status);
template = new Template(record.Save(), record.Minutiae.Count);
extractor.Dispose();
}
catch (Exception ex)
{
OnTemplateCaptured(new TemplateCapturedEventArgs(template, TemplateCapturedStatus.ExtractorException));
return;
}
if (status == NfeExtractionStatus.QualityCheckFailed)
{
OnTemplateCaptured(new TemplateCapturedEventArgs(template, TemplateCapturedStatus.QualityCheckFailed));
return;
}
if (status == NfeExtractionStatus.TooFewMinutiae)
{
OnTemplateCaptured(new TemplateCapturedEventArgs(template, TemplateCapturedStatus.MinutiaCountFailed));
return;
}
OnTemplateCaptured(new TemplateCapturedEventArgs(template, TemplateCapturedStatus.Success));
}
}
}
