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I have U.are.u fingerprint 4500 reader, currently the sdk that came with it saves the fingerprint template as a file instead of to a database. I would like to save it into a database and also be able to verify the finger from the database. That is the code below

What I have tried:

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;

}
Posted
Updated 11-Jan-17 10:29am

1 solution

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Solution 1

Once the file is saved to the disk you can save the bytes from the file to the database. This is basically the same as for example saving a picture from a file to database.

There are quite a few examples, but here's one comparing different options you have when storing binary data How to store and fetch binary data into a file stream column[^]

And when you want to use the file again, read it from the database, save it to disk and use normally.
   
v2
Comments
King_Eke 11-Jan-17 16:52pm
   
I'm still a noob on this, and i'm using it for my final year project. Is it possible for us to talk privately ?
Wendelius 11-Jan-17 23:19pm
   
I'm afraid not. But if you are stuck at something or have other specific questions post them along with details and code as questions in Q&A and I believe that you'll get help to your problem.

Good luck.

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