C# QR Code Reader (Step by Step Tutorial for Beginner)

using AForge.Video.DirectShow;
using AForge.Video;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using IronQR;

namespace ReadQR
{
    public partial class Form1 : Form
    {
        // Declare a video capture device
        private VideoCaptureDevice videoSource;

        public Form1()
        {
            InitializeComponent();
            this.Load += Form1_Load;
            this.FormClosing += Form1_FormClosing;
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            // Stop the video source when the form is closing
            if (videoSource != null && videoSource.IsRunning)
            {
                videoSource.SignalToStop();
                videoSource.WaitForStop();
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // Retrieve video input devices connected to the machine
            FilterInfoCollection videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);

            if (videoDevices.Count > 0)
            {
                // Use the first available video device
                videoSource = new VideoCaptureDevice(videoDevices[0].MonikerString);
                videoSource.NewFrame += VideoSource_NewFrame;
                videoSource.Start();
            }
            else
            {
                MessageBox.Show("No video devices found.");
                Close();
            }
        }

        private void VideoSource_NewFrame(object sender, NewFrameEventArgs eventArgs)
        {
            // Update the PictureBox with the new frame from the camera
            pictureBox1.Image = (Bitmap)eventArgs.Frame.Clone();

            var image = (Bitmap)eventArgs.Frame.Clone();

            // Set the license key for IronQR. Replace "YourKey" with your actual key
            License.LicenseKey = "YourKey";

            // Prepare the image for QR code reading
            QrImageInput imageInput = new QrImageInput(image);

            // Create a QR reader object
            QrReader reader = new QrReader();

            // Read QR codes from the image
            IEnumerable<QrResult> results = reader.Read(imageInput);

            // Display the first QR code result in a MessageBox
            if (results.Any())
            {
                MessageBox.Show(results.First().Value);
            }
        }
    }
}

Imports AForge.Video.DirectShow
Imports AForge.Video
Imports System
Imports System.Collections.Generic
Imports System.Drawing
Imports System.Linq
Imports System.Windows.Forms
Imports IronQR

Namespace ReadQR
	Partial Public Class Form1
		Inherits Form

		' Declare a video capture device
		Private videoSource As VideoCaptureDevice

		Public Sub New()
			InitializeComponent()
			AddHandler Me.Load, AddressOf Form1_Load
			AddHandler Me.FormClosing, AddressOf Form1_FormClosing
		End Sub

		Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As FormClosingEventArgs)
			' Stop the video source when the form is closing
			If videoSource IsNot Nothing AndAlso videoSource.IsRunning Then
				videoSource.SignalToStop()
				videoSource.WaitForStop()
			End If
		End Sub

		Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
			' Retrieve video input devices connected to the machine
			Dim videoDevices As New FilterInfoCollection(FilterCategory.VideoInputDevice)

			If videoDevices.Count > 0 Then
				' Use the first available video device
				videoSource = New VideoCaptureDevice(videoDevices(0).MonikerString)
				AddHandler videoSource.NewFrame, AddressOf VideoSource_NewFrame
				videoSource.Start()
			Else
				MessageBox.Show("No video devices found.")
				Close()
			End If
		End Sub

		Private Sub VideoSource_NewFrame(ByVal sender As Object, ByVal eventArgs As NewFrameEventArgs)
			' Update the PictureBox with the new frame from the camera
			pictureBox1.Image = DirectCast(eventArgs.Frame.Clone(), Bitmap)

			Dim image = DirectCast(eventArgs.Frame.Clone(), Bitmap)

			' Set the license key for IronQR. Replace "YourKey" with your actual key
			License.LicenseKey = "YourKey"

			' Prepare the image for QR code reading
			Dim imageInput As New QrImageInput(image)

			' Create a QR reader object
			Dim reader As New QrReader()

			' Read QR codes from the image
			Dim results As IEnumerable(Of QrResult) = reader.Read(imageInput)

			' Display the first QR code result in a MessageBox
			If results.Any() Then
				MessageBox.Show(results.First().Value)
			End If
		End Sub
	End Class
End Namespace