Integrate ZK4500 Biometric Finger Print Reader using C# and VB.Net in Windows Application

Hi lightsomal,

For ZK4500 Fingerprint integration you can refer below link for complete sample in Windows application.

https://github.com/zaagan/ZKTecoFingerPrintScanner-Implementation

Or download the AxInterop.ZKFPEngXControl.dll from below link.

https://github.com/ehmad11/ZKTeco-ZK4500/tree/master/dlls

Add the dll reference in your project.

Form Design

Then import the namespaces.

Namespaces

C#

using System.Drawing;
using AxZKFPEngXControl;

VB.Net 

Imports System.Drawing
Imports AxZKFPEngXControl

Code

C#

private AxZKFPEngX ZkFprint = new AxZKFPEngX();
private bool Check;
public Form1()
{
    InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
    Controls.Add(ZkFprint);
    InitialAxZkfp();
}
private void InitialAxZkfp()
{
    try
    {
        ZkFprint.OnImageReceived += zkFprint_OnImageReceived;
        ZkFprint.OnFeatureInfo += zkFprint_OnFeatureInfo;
        ZkFprint.OnEnroll += zkFprint_OnEnroll;

        if (ZkFprint.InitEngine() == 0)
        {
            ZkFprint.FPEngineVersion = "9";
            ZkFprint.EnrollCount = 3;
            deviceSerial.Text += " " + ZkFprint.SensorSN + " Count: " + ZkFprint.SensorCount.ToString() + " Index: " + ZkFprint.SensorIndex.ToString();
            ShowHintInfo("Device successfully connected");
        }
    }
    catch (Exception ex)
    {
        ShowHintInfo("Device init err, error: " + ex.Message);
    }
}
private void zkFprint_OnImageReceived(object sender, IZKFPEngXEvents_OnImageReceivedEvent e)
{
    Graphics g = fpicture.CreateGraphics();
    Bitmap bmp = new Bitmap(fpicture.Width, fpicture.Height);
    g = Graphics.FromImage(bmp);
    int dc = g.GetHdc().ToInt32();
    ZkFprint.PrintImageAt(dc, 0, 0, bmp.Width, bmp.Height);
    g.Dispose();
    fpicture.Image = bmp;
}
private void zkFprint_OnFeatureInfo(object sender, IZKFPEngXEvents_OnFeatureInfoEvent e)
{
    String strTemp = string.Empty;
    if (ZkFprint.EnrollIndex != 1)
    {
        if (ZkFprint.IsRegister)
        {
            if (ZkFprint.EnrollIndex - 1 > 0)
            {
                int eindex = ZkFprint.EnrollIndex - 1;
                strTemp = "Please scan again ..." + eindex;
            }
        }
    }
    ShowHintInfo(strTemp);
}
private void zkFprint_OnEnroll(object sender, IZKFPEngXEvents_OnEnrollEvent e)
{
    if (e.actionResult)
    {
        string template = ZkFprint.EncodeTemplate1(e.aTemplate);
        txtTemplate.Text = template;
        ShowHintInfo("Registration successful. You can verify now");
        btnRegister.Enabled = false;
        btnVerify.Enabled = true;
    }
    else
    {
        ShowHintInfo("Error, please register again.");
    }
}
private void zkFprint_OnCapture(object sender, IZKFPEngXEvents_OnCaptureEvent e)
{
    string template = ZkFprint.EncodeTemplate1(e.aTemplate);
    if (ZkFprint.VerFingerFromStr(ref template, txtTemplate.Text, false, ref Check))
    {
        ShowHintInfo("Verified");
    }
    else
    {
        ShowHintInfo("Not Verified");
    }
}
private void ShowHintInfo(String s)
{
    prompt.Text = s;
}
private void btnVerify_Click(object sender, EventArgs e)
{
    if (ZkFprint.IsRegister)
    {
        ZkFprint.CancelEnroll();
    }
    ZkFprint.OnCapture += zkFprint_OnCapture;
    ZkFprint.BeginCapture();
    ShowHintInfo("Please give fingerprint sample.");
}
private void btnRegister_Click(object sender, EventArgs e)
{
    ZkFprint.CancelEnroll();
    ZkFprint.EnrollCount = 3;
    ZkFprint.BeginEnroll();
    ShowHintInfo("Please give fingerprint sample.");
}
private void btnClear_Click(object sender, EventArgs e)
{
    fpicture.Image = null;
}

VB.Net

Private ZkFprint As AxZKFPEngX = New AxZKFPEngX()
Private Check As Boolean

Public Sub New()
    InitializeComponent()
End Sub

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load
    Controls.Add(ZkFprint)
    InitialAxZkfp()
End Sub

Private Sub InitialAxZkfp()
    Try
        AddHandler ZkFprint.OnImageReceived, AddressOf zkFprint_OnImageReceived
        AddHandler ZkFprint.OnFeatureInfo, AddressOf zkFprint_OnFeatureInfo
        AddHandler ZkFprint.OnEnroll, AddressOf zkFprint_OnEnroll

        If ZkFprint.InitEngine() = 0 Then
            ZkFprint.FPEngineVersion = "9"
            ZkFprint.EnrollCount = 3
            deviceSerial.Text += " " & ZkFprint.SensorSN & " Count: " + ZkFprint.SensorCount.ToString() & " Index: " + ZkFprint.SensorIndex.ToString()
            ShowHintInfo("Device successfully connected")
        End If

    Catch ex As Exception
        ShowHintInfo("Device init err, error: " & ex.Message)
    End Try
End Sub

Private Sub zkFprint_OnImageReceived(ByVal sender As Object, ByVal e As IZKFPEngXEvents_OnImageReceivedEvent)
    Dim g As Graphics = fpicture.CreateGraphics()
    Dim bmp As Bitmap = New Bitmap(fpicture.Width, fpicture.Height)
    g = Graphics.FromImage(bmp)
    Dim dc As Integer = g.GetHdc().ToInt32()
    ZkFprint.PrintImageAt(dc, 0, 0, bmp.Width, bmp.Height)
    g.Dispose()
    fpicture.Image = bmp
End Sub

Private Sub zkFprint_OnFeatureInfo(ByVal sender As Object, ByVal e As IZKFPEngXEvents_OnFeatureInfoEvent)
    Dim strTemp As String = String.Empty
    If ZkFprint.EnrollIndex <> 1 Then
        If ZkFprint.IsRegister Then
            If ZkFprint.EnrollIndex - 1 > 0 Then
                Dim eindex As Integer = ZkFprint.EnrollIndex - 1
                strTemp = "Please scan again ..." & eindex
            End If
        End If
    End If

    ShowHintInfo(strTemp)
End Sub

Private Sub zkFprint_OnEnroll(ByVal sender As Object, ByVal e As IZKFPEngXEvents_OnEnrollEvent)
    If e.actionResult Then
        Dim template As String = ZkFprint.EncodeTemplate1(e.aTemplate)
        txtTemplate.Text = template
        ShowHintInfo("Registration successful. You can verify now")
        btnRegister.Enabled = False
        btnVerify.Enabled = True
    Else
        ShowHintInfo("Error, please register again.")
    End If
End Sub

Private Sub zkFprint_OnCapture(ByVal sender As Object, ByVal e As IZKFPEngXEvents_OnCaptureEvent)
    Dim template As String = ZkFprint.EncodeTemplate1(e.aTemplate)

    If ZkFprint.VerFingerFromStr(template, txtTemplate.Text, False, Check) Then
        ShowHintInfo("Verified")
    Else
        ShowHintInfo("Not Verified")
    End If
End Sub

Private Sub ShowHintInfo(ByVal s As String)
    prompt.Text = s
End Sub

Private Sub btnVerify_Click(ByVal sender As Object, ByVal e As EventArgs)
    If ZkFprint.IsRegister Then
        ZkFprint.CancelEnroll()
    End If

    AddHandler ZkFprint.OnCapture, AddressOf zkFprint_OnCapture
    ZkFprint.BeginCapture()
    ShowHintInfo("Please give fingerprint sample.")
End Sub

Private Sub btnRegister_Click(ByVal sender As Object, ByVal e As EventArgs)
    ZkFprint.CancelEnroll()
    ZkFprint.EnrollCount = 3
    ZkFprint.BeginEnroll()
    ShowHintInfo("Please give fingerprint sample.")
End Sub

Private Sub btnClear_Click(ByVal sender As Object, ByVal e As EventArgs)
    fpicture.Image = Nothing
End Sub

For sample project refer below link.

https://github.com/ehmad11/ZKTeco-ZK4500