captureform.cs

DigitalPersona.rar

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace Enrollment
{
	/* NOTE: This form is a base for the EnrollmentForm and the VerificationForm,
		All changes in the CaptureForm will be reflected in all its derived forms.
	*/
	public partial class CaptureForm : Form, DPFP.Capture.EventHandler
	{
		public CaptureForm()
		{
			InitializeComponent();
		}

		protected virtual void Init()
		{
			Capturer = new DPFP.Capture.Capture();					// Create a capture operation.
			Capturer.EventHandler = this;							// Subscribe for capturing events.
		}

		protected virtual void Process(DPFP.Sample Sample)
		{
			// Draw fingerprint sample image.
			DrawPicture(ConvertSampleToBitmap(Sample));
		}

		protected void Start()
		{
			Capturer.StartCapture();
			SetPrompt("Using the fingerprint reader, scan your fingerprint.");
		}

		protected void Stop()
		{
			Capturer.StopCapture();
		}
		
	#region Form Event Handlers:

		private void CaptureForm_Load(object sender, EventArgs e)
		{
			Init();
			Start();												// Start capture operation.
		}

		private void CaptureForm_FormClosed(object sender, FormClosedEventArgs e)
		{
			Stop();
		}
	#endregion

	#region EventHandler Members:

		public void OnComplete(object Capture, string ReaderSerialNumber, DPFP.Sample Sample)
		{
			MakeReport("The fingerprint sample was captured.");
			SetPrompt("Scan the same fingerprint again.");
			Process(Sample);
		}

		public void OnFingerGone(object Capture, string ReaderSerialNumber)
		{
			MakeReport("The finger was removed from the fingerprint reader.");
		}

		public void OnFingerTouch(object Capture, string ReaderSerialNumber)
		{
			MakeReport("The fingerprint reader was touched.");
		}

		public void OnReaderConnect(object Capture, string ReaderSerialNumber)
		{
			MakeReport("The fingerprint reader was connected.");
		}

		public void OnReaderDisconnect(object Capture, string ReaderSerialNumber)
		{
			MakeReport("The fingerprint reader was disconnected.");
		}

		public void OnSampleQuality(object Capture, string ReaderSerialNumber, DPFP.Capture.CaptureFeedback CaptureFeedback)
		{
			if (CaptureFeedback == DPFP.Capture.CaptureFeedback.Good)
				MakeReport("The quality of the fingerprint sample is good.");
			else
				MakeReport("The quality of the fingerprint sample is poor.");
		}
	#endregion

		protected Bitmap ConvertSampleToBitmap(DPFP.Sample Sample)
		{
			DPFP.Capture.SampleConversion Convertor = new DPFP.Capture.SampleConversion();	// Create a sample convertor.
			Bitmap bitmap = null;												            // TODO: the size doesn't matter
			Convertor.ConvertToPicture(Sample, ref bitmap);									// TODO: return bitmap as a result
			return bitmap;
		}

		protected DPFP.FeatureSet ExtractFeatures(DPFP.Sample Sample, DPFP.Processing.DataPurpose Purpose)
		{
			DPFP.Processing.FeatureExtraction Extractor = new DPFP.Processing.FeatureExtraction();	// Create a feature extractor
			DPFP.Capture.CaptureFeedback feedback = DPFP.Capture.CaptureFeedback.None;
			DPFP.FeatureSet features = new DPFP.FeatureSet();
			Extractor.CreateFeatureSet(Sample, Purpose, ref feedback, ref features);			// TODO: return features as a result?
			if (feedback == DPFP.Capture.CaptureFeedback.Good)
				return features;
			else
				return null;
		}

		protected void SetStatus(string status)
		{
			this.Invoke(new Function(delegate() {
				StatusLine.Text = status;
			}));
		}

		protected void SetPrompt(string prompt)
		{
			this.Invoke(new Function(delegate() {
				Prompt.Text = prompt;
			}));
		}
		protected void MakeReport(string message)
		{
			this.Invoke(new Function(delegate() {
				StatusText.AppendText(message + "\r\n");
			}));
		}

		private void DrawPicture(Bitmap bitmap)
		{
			this.Invoke(new Function(delegate() {
				Picture.Image = new Bitmap(bitmap, Picture.Size);	// fit the image into the picture box
			}));
		}

		private DPFP.Capture.Capture Capturer;

	}
}