How to Create a QR Code Generator Application In C#

using IronQr;
using IronSoftware.Drawing;
using Color = IronSoftware.Drawing.Color;

// Set the license key for IronQR
IronQr.License.LicenseKey = "License-Key";

// Load the image file that contains the QR Code
var inputImage = AnyBitmap.FromFile("QRCode.png");

// Prepare the image for QR code detection
QrImageInput qrInput = new QrImageInput(inputImage);

// Initialize the QR Code reader
QrReader qrReader = new QrReader();

// Execute QR Code reading on the provided image
IEnumerable<QrResult> qrResults = qrReader.Read(qrInput);

// Print the value of each QR code found in the image
foreach (var result in qrResults)
{
    Console.WriteLine(result.Value);
}

Imports IronQr
Imports IronSoftware.Drawing
Imports Color = IronSoftware.Drawing.Color

' Set the license key for IronQR
IronQr.License.LicenseKey = "License-Key"

' Load the image file that contains the QR Code
Dim inputImage = AnyBitmap.FromFile("QRCode.png")

' Prepare the image for QR code detection
Dim qrInput As New QrImageInput(inputImage)

' Initialize the QR Code reader
Dim qrReader As New QrReader()

' Execute QR Code reading on the provided image
Dim qrResults As IEnumerable(Of QrResult) = qrReader.Read(qrInput)

' Print the value of each QR code found in the image
For Each result In qrResults
	Console.WriteLine(result.Value)
Next result

using IronQr;
using IronQr.Enum;
using IronSoftware.Drawing;
using Color = IronSoftware.Drawing.Color;

// Set the license key for IronQR
IronQr.License.LicenseKey = "License-Key";

// Load the image file that contains the QR Code
var inputImage = AnyBitmap.FromFile("QRCode.png");

// Using mixed scan mode
QrImageInput mixedScanInput = new QrImageInput(inputImage, QrScanMode.OnlyDetectionModel);
IEnumerable<QrResult> mixedScanResults = new QrReader().Read(mixedScanInput);

// Using machine learning scan mode
QrImageInput mlScanInput = new QrImageInput(inputImage, QrScanMode.OnlyDetectionModel);
IEnumerable<QrResult> mlScanResults = new QrReader().Read(mlScanInput);

// Using basic scan mode
QrImageInput basicScanInput = new QrImageInput(inputImage, QrScanMode.OnlyBasicScan);
IEnumerable<QrResult> basicScanResults = new QrReader().Read(basicScanInput);

Imports IronQr
Imports IronQr.Enum
Imports IronSoftware.Drawing
Imports Color = IronSoftware.Drawing.Color

' Set the license key for IronQR
IronQr.License.LicenseKey = "License-Key"

' Load the image file that contains the QR Code
Dim inputImage = AnyBitmap.FromFile("QRCode.png")

' Using mixed scan mode
Dim mixedScanInput As New QrImageInput(inputImage, QrScanMode.OnlyDetectionModel)
Dim mixedScanResults As IEnumerable(Of QrResult) = (New QrReader()).Read(mixedScanInput)

' Using machine learning scan mode
Dim mlScanInput As New QrImageInput(inputImage, QrScanMode.OnlyDetectionModel)
Dim mlScanResults As IEnumerable(Of QrResult) = (New QrReader()).Read(mlScanInput)

' Using basic scan mode
Dim basicScanInput As New QrImageInput(inputImage, QrScanMode.OnlyBasicScan)
Dim basicScanResults As IEnumerable(Of QrResult) = (New QrReader()).Read(basicScanInput)

using IronQr;
using IronQr.Enum;
using IronSoftware.Drawing;
using Color = IronSoftware.Drawing.Color;

// Set the license key for IronQR
IronQr.License.LicenseKey = "License-Key";

// Load the image to scan
var imageToScan = AnyBitmap.FromFile("QRCode.png");

// Prepare the image for QR code detection
QrImageInput qrInput = new QrImageInput(imageToScan);

// Initialize the QR Code reader
QrReader qrScanner = new QrReader();

// Execute QR Code reading on the provided image
IEnumerable<QrResult> scanResults = qrScanner.Read(qrInput);

// Print the value, URL, and coordinates of each QR code found in the image
foreach (QrResult qrResult in scanResults)
{
    Console.WriteLine(qrResult.Value);
    Console.WriteLine(qrResult.Url);
    foreach (IronSoftware.Drawing.PointF coordinate in qrResult.Points)
    {
        Console.WriteLine($"{coordinate.X}, {coordinate.Y}");
    }
}

Imports IronQr
Imports IronQr.Enum
Imports IronSoftware.Drawing
Imports Color = IronSoftware.Drawing.Color

' Set the license key for IronQR
IronQr.License.LicenseKey = "License-Key"

' Load the image to scan
Dim imageToScan = AnyBitmap.FromFile("QRCode.png")

' Prepare the image for QR code detection
Dim qrInput As New QrImageInput(imageToScan)

' Initialize the QR Code reader
Dim qrScanner As New QrReader()

' Execute QR Code reading on the provided image
Dim scanResults As IEnumerable(Of QrResult) = qrScanner.Read(qrInput)

' Print the value, URL, and coordinates of each QR code found in the image
For Each qrResult As QrResult In scanResults
	Console.WriteLine(qrResult.Value)
	Console.WriteLine(qrResult.Url)
	For Each coordinate As IronSoftware.Drawing.PointF In qrResult.Points
		Console.WriteLine($"{coordinate.X}, {coordinate.Y}")
	Next coordinate
Next qrResult

using IronQr;
using IronSoftware.Drawing;
using Color = IronSoftware.Drawing.Color;

Imports IronQr
Imports IronSoftware.Drawing
Imports Color = IronSoftware.Drawing.Color

public QR_Generator()
{
    InitializeComponent();
    SetLicenseKey();
    EnsureDirectoryExists(qrCodesDirectory);
}

'INSTANT VB WARNING: The following constructor is declared outside of its associated class:
'ORIGINAL LINE: public QR_Generator()
Public Sub New()
	InitializeComponent()
	SetLicenseKey()
	EnsureDirectoryExists(qrCodesDirectory)
End Sub

private static void SetLicenseKey()
{
    IronQr.License.LicenseKey = "YOUR_LICENSE_KEY";
}

Private Shared Sub SetLicenseKey()
	IronQr.License.LicenseKey = "YOUR_LICENSE_KEY"
End Sub

private static void EnsureDirectoryExists(string path)
{
    if (!System.IO.Directory.Exists(path))
    {
        System.IO.Directory.CreateDirectory(path);
    }
}

Private Shared Sub EnsureDirectoryExists(ByVal path As String)
	If Not System.IO.Directory.Exists(path) Then
		System.IO.Directory.CreateDirectory(path)
	End If
End Sub

string qrCodesDirectory = System.IO.Path.Combine(Application.StartupPath, "QR Codes");

Dim qrCodesDirectory As String = System.IO.Path.Combine(Application.StartupPath, "QR Codes")

private string ColorToHex(System.Drawing.Color color)
{
    return $"#{color.R:X2}{color.G:X2}{color.B:X2}";
}

Private Function ColorToHex(ByVal color As System.Drawing.Color) As String
	Return $"#{color.R:X2}{color.G:X2}{color.B:X2}"
End Function

private void UpdateColor(ref Color targetColor, Control display, bool isBackground)
{
    if (select_color.ShowDialog() == DialogResult.OK)
    {
        var hexColor = ColorToHex(select_color.Color);
        targetColor = new Color(hexColor);
        display.BackColor = select_color.Color;
    }
}

Private Sub UpdateColor(ByRef targetColor As Color, ByVal display As Control, ByVal isBackground As Boolean)
	If select_color.ShowDialog() = DialogResult.OK Then
		Dim hexColor = ColorToHex(select_color.Color)
		targetColor = New Color(hexColor)
		display.BackColor = select_color.Color
	End If
End Sub

private void btn_logo_Click(object sender, EventArgs e)
{
    if (select_logo.ShowDialog() == DialogResult.OK)
    {
        try
        {
            logoBmp = new AnyBitmap(select_logo.FileName);
            selected_logo.Image = Image.FromFile(select_logo.FileName);
        }
        catch (Exception ex)
        {
            ShowError("An error occurred while loading the logo", ex.Message);
        }
    }
}

Private Sub btn_logo_Click(ByVal sender As Object, ByVal e As EventArgs)
	If select_logo.ShowDialog() = DialogResult.OK Then
		Try
			logoBmp = New AnyBitmap(select_logo.FileName)
			selected_logo.Image = Image.FromFile(select_logo.FileName)
		Catch ex As Exception
			ShowError("An error occurred while loading the logo", ex.Message)
		End Try
	End If
End Sub

private void btn_generate_Click(object sender, EventArgs e)
{
    GenerateQRCode();
}

Private Sub btn_generate_Click(ByVal sender As Object, ByVal e As EventArgs)
	GenerateQRCode()
End Sub

private void GenerateQRCode()
{
    try
    {
        var options = new QrOptions(QrErrorCorrectionLevel.High);
        var myQr = QrWriter.Write(txt_QR.Text, options);
        var style = CreateStyleOptions();
        var qrImage = myQr.Save(style);
        var fileName = $"{DateTime.Now:yyyyMMddHHmmssfff}_QR.png";
        var fullPath = System.IO.Path.Combine(qrCodesDirectory, fileName);
        qrImage.SaveAs(fullPath);
        pictureBox.Image = Image.FromFile(fullPath);
    }
    catch (Exception ex)
    {
        ShowError("An error occurred during QR code generation or saving", ex.Message);
    }
}

Private Sub GenerateQRCode()
	Try
		Dim options = New QrOptions(QrErrorCorrectionLevel.High)
		Dim myQr = QrWriter.Write(txt_QR.Text, options)
		Dim style = CreateStyleOptions()
		Dim qrImage = myQr.Save(style)
		Dim fileName = $"{DateTime.Now:yyyyMMddHHmmssfff}_QR.png"
		Dim fullPath = System.IO.Path.Combine(qrCodesDirectory, fileName)
		qrImage.SaveAs(fullPath)
		pictureBox.Image = Image.FromFile(fullPath)
	Catch ex As Exception
		ShowError("An error occurred during QR code generation or saving", ex.Message)
	End Try
End Sub

private QrStyleOptions CreateStyleOptions()
{
    return new QrStyleOptions
    {
        BackgroundColor = bgColor,
        Color = color,
        Dimensions = txt_dimension.Value > 0 ? Convert.ToInt32(txt_dimension.Value) : throw new ArgumentException("Please select valid dimensions!"),
        Margins = Convert.ToInt32(txt_margin.Value),
        Logo = logoBmp != null ? new QrLogo { Bitmap = logoBmp, Width = 50, Height = 50, CornerRadius = 5 } : null
    };
}

Private Function CreateStyleOptions() As QrStyleOptions
'INSTANT VB TODO TASK: Throw expressions are not converted by Instant VB:
'ORIGINAL LINE: return new QrStyleOptions { BackgroundColor = bgColor, Color = color, Dimensions = txt_dimension.Value > 0 ? Convert.ToInt32(txt_dimension.Value) : throw new ArgumentException("Please select valid dimensions!"), Margins = Convert.ToInt32(txt_margin.Value), Logo = logoBmp != null ? new QrLogo { Bitmap = logoBmp, Width = 50, Height = 50, CornerRadius = 5 } : null };
	Return New QrStyleOptions With {
		.BackgroundColor = bgColor,
		.Color = color,
		.Dimensions = If(txt_dimension.Value > 0, Convert.ToInt32(txt_dimension.Value), throw New ArgumentException("Please select valid dimensions!")),
		.Margins = Convert.ToInt32(txt_margin.Value),
		.Logo = If(logoBmp IsNot Nothing, New QrLogo With {
			.Bitmap = logoBmp,
			.Width = 50,
			.Height = 50,
			.CornerRadius = 5
		}, Nothing)
	}
End Function

private void btn_save_Click(object sender, EventArgs e)
{
    SaveQRCode();
}
private void SaveQRCode()
{
    if (pictureBox.Image == null)
    {
        MessageBox.Show("There is no QR code to save.", "Error");
        return;
    }
    saveFileDialog.Filter = "PNG Files|*.png|JPEG Files|*.jpg";
    saveFileDialog.Title = "Save QR Code";
    saveFileDialog.FileName = "QRCode";
    if (saveFileDialog.ShowDialog() == DialogResult.OK)
    {
        try
        {
            pictureBox.Image.Save(saveFileDialog.FileName, DetermineImageFormat(saveFileDialog.FileName));
            MessageBox.Show("QR Code has been saved!", "Success");
        }
        catch (Exception ex)
        {
            ShowError("An error occurred while saving the QR code", ex.Message);
        }
    }
}

Private Sub btn_save_Click(ByVal sender As Object, ByVal e As EventArgs)
	SaveQRCode()
End Sub
Private Sub SaveQRCode()
	If pictureBox.Image Is Nothing Then
		MessageBox.Show("There is no QR code to save.", "Error")
		Return
	End If
	saveFileDialog.Filter = "PNG Files|*.png|JPEG Files|*.jpg"
	saveFileDialog.Title = "Save QR Code"
	saveFileDialog.FileName = "QRCode"
	If saveFileDialog.ShowDialog() = DialogResult.OK Then
		Try
			pictureBox.Image.Save(saveFileDialog.FileName, DetermineImageFormat(saveFileDialog.FileName))
			MessageBox.Show("QR Code has been saved!", "Success")
		Catch ex As Exception
			ShowError("An error occurred while saving the QR code", ex.Message)
		End Try
	End If
End Sub

private System.Drawing.Imaging.ImageFormat DetermineImageFormat(string filePath)
{
    return System.IO.Path.GetExtension(filePath).ToLower() == ".jpg" ? System.Drawing.Imaging.ImageFormat.Jpeg : System.Drawing.Imaging.ImageFormat.Png;
}

Private Function DetermineImageFormat(ByVal filePath As String) As System.Drawing.Imaging.ImageFormat
	Return If(System.IO.Path.GetExtension(filePath).ToLower() = ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg, System.Drawing.Imaging.ImageFormat.Png)
End Function

private void btn_reset_Click(object sender, EventArgs e)
{
    ResetFields();
}
private void ResetFields()
{
    txt_QR.Text = string.Empty;
    txt_dimension.Value = 200;
    txt_margin.Value = 0;
    bgColor = Color.White;
    color = Color.Black;
    txt_selected_color.BackColor = bgColor;
    txt_selected_bgcolor.BackColor = color;
    logoBmp = null;
    selected_logo.Image = null;
    pictureBox.Image = null;
}

Private Sub btn_reset_Click(ByVal sender As Object, ByVal e As EventArgs)
	ResetFields()
End Sub
Private Sub ResetFields()
	txt_QR.Text = String.Empty
	txt_dimension.Value = 200
	txt_margin.Value = 0
	bgColor = Color.White
	color = Color.Black
	txt_selected_color.BackColor = bgColor
	txt_selected_bgcolor.BackColor = color
	logoBmp = Nothing
	selected_logo.Image = Nothing
	pictureBox.Image = Nothing
End Sub

private static void ShowError(string title, string message)
{
    MessageBox.Show($"{title}: {message}", "Error");
}

Private Shared Sub ShowError(ByVal title As String, ByVal message As String)
	MessageBox.Show($"{title}: {message}", "Error")
End Sub