使用DigitalPersona 4500阅读器进行指纹扫描。如何获取捕获的图像和加载事件处理程序

Question

我是C＃生物识别传感器和DLL编码的新手。我正在使用DigitalPersona阅读器UareU 4500.我已阅读API文档并查看了他们提供的示例程序。但是，我对使用GUI版本不感兴趣。我想使用API​​方法。我搜索过示例，但无法找到任何描述性的示例。请帮忙。

我的问题是如何设置加载EventHandlers以及如何在位图图像中获取指纹。

提前谢谢你。任何信息或指南都非常感激。

class FingerprintScanning
{
    public DPFP.Capture.Capture fingerprint = new DPFP.Capture.Capture();
    public DPFP.Sample sample = new DPFP.Sample();
    public DPFP.Capture.EventHandler EventHandler;
    public Bitmap picture_result = null;


    public void CaptureFingerprint()
    {
        fingerprint.StartCapture();

        //Events
     EventHandler.OnFingerTouch(fingerprint,fingerprint.ReaderSerialNumber);
 EventHandler.OnComplete(fingerprint,fingerprint.ReaderSerialNumber,sample);

        //Convert to Bitmap
        SampleConversion image = new SampleConversion();
        image.ConvertToPicture(sample, ref picture_result);
        fingerprint.StopCapture();

    }

}

Answer 1

我找到了使用SDK API的示例。在这里分享，以防任何人需要在项目中实施。

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()
    {
        try
        {
            Capturer = new DPFP.Capture.Capture();              // Create a capture operation.

            if ( null != Capturer )
                Capturer.EventHandler = this;                   // Subscribe for capturing events.
            else
                SetPrompt("Can't initiate capture operation!");
        }
        catch
        {               
            MessageBox.Show("Can't initiate capture operation!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);            
        }
    }

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

    protected void Start()
    {
        if (null != Capturer)
        {
            try
            {
                Capturer.StartCapture();
                SetPrompt("Using the fingerprint reader, scan your fingerprint.");
            }
            catch
            {
                SetPrompt("Can't initiate capture!");
            }
        }
    }

    protected void Stop()
    {
        if (null != Capturer)
        {
            try
            {
                Capturer.StopCapture();
            }
            catch
            {
                SetPrompt("Can't terminate capture!");
            }
        }
    }

#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;

    }
}