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This tutorial provides an in-depth look at how to create QR codes, which are becoming increasingly popular in industrial applications and the retail sector. The IronBarcode library, one of the most popular and powerful libraries, will be used to demonstrate how to generate QR codes.
Open Visual Studio > Click on Create New Project > Select Windows Forms Application Template > Press Next > Name the Project > Press Next > Select your Target .NET Framework > Click the Create button.
After creating the project, design the form using the following controls from the Visual Studio toolbox: PictureBox
, Label
, TextBox
, and Button
.
A Windows Forms Application UI to load an image and generate a QR Code
The first step is to install the barcode library. You can do this by using one of the following three methods:
Write the following command in the Package Manager Console. It will download and install the package for you.
Install-Package BarCode
Installation progress in Package Manager Console UI
You can also install the barcode library using the NuGet Package Solution. Simply follow these steps:
Click on Tools > NuGet Package Manager > Manage NuGet Packages for Solution.
This will open the NuGet Package Manager for you. Click on Browse, search for BarCode, and then install the class library.
Finding BarCode library in NuGet Package Manager
As an alternative, the IronBarCode.Dll can be downloaded and added to your project as a reference from .NET Barcode DLL.
For this tutorial, to ensure adequate references, the IronBarCode
namespace along with other system assemblies is necessary.
using IronBarCode; // Provides functionality for QR and barcode generation
using System; // Contains fundamental classes and base classes that define commonly-used value and reference data types
using System.Drawing; // Provides access to GDI+ basic graphic functionality
using System.Linq; // Provides classes and interfaces that support queries
using IronBarCode; // Provides functionality for QR and barcode generation
using System; // Contains fundamental classes and base classes that define commonly-used value and reference data types
using System.Drawing; // Provides access to GDI+ basic graphic functionality
using System.Linq; // Provides classes and interfaces that support queries
Imports IronBarCode ' Provides functionality for QR and barcode generation
Imports System ' Contains fundamental classes and base classes that define commonly-used value and reference data types
Imports System.Drawing ' Provides access to GDI+ basic graphic functionality
Imports System.Linq ' Provides classes and interfaces that support queries
The following sample code allows you to generate a QR code image with just one line of code. Enter the desired text into the text box for which you want to generate a QR code. Place this code in the "Generate PNG" button click event. The QR code images can be saved in PNG format.
// Simple QR Code generation
private void button1_Click(object sender, EventArgs e)
{
// Generate a QR code from the text provided in the TextBox
GeneratedBarcode qrCode = QRCodeWriter.CreateQrCode(textBox1.Text);
// Save the generated QR code as a PNG file
qrCode.SaveAsPng("QrCode.png");
}
// Simple QR Code generation
private void button1_Click(object sender, EventArgs e)
{
// Generate a QR code from the text provided in the TextBox
GeneratedBarcode qrCode = QRCodeWriter.CreateQrCode(textBox1.Text);
// Save the generated QR code as a PNG file
qrCode.SaveAsPng("QrCode.png");
}
' Simple QR Code generation
Private Sub button1_Click(ByVal sender As Object, ByVal e As EventArgs)
' Generate a QR code from the text provided in the TextBox
Dim qrCode As GeneratedBarcode = QRCodeWriter.CreateQrCode(textBox1.Text)
' Save the generated QR code as a PNG file
qrCode.SaveAsPng("QrCode.png")
End Sub
Here is the output of the QR code generator:
QR code of: https://ironsoftware.com/csharp/barcode/docs/
By using the CreateQrCodeWithLogo
method from the QRCodeWriter
class, additional information, such as a logo, can be added to the QR code. The sample code illustrates how easy this is.
Browse the logo from your computer, and it will open in PictureBox
. The code goes as follows:
// Open file dialog to select an image
OpenFileDialog open = new OpenFileDialog();
// Set image file filters to ensure valid image types are opened
open.Filter = "Image Files(*.jpg; *.png; *.jpeg; *.gif; *.bmp)
*.jpg; *.png; *.jpeg; *.gif; *.bmp";
if (open.ShowDialog() == DialogResult.OK) {
// Display image in PictureBox and store file path for later use
pictureBox1.Image = new Bitmap(open.FileName);
// Store image file path in class data member
ImageFileName = open.FileName;
}
// Open file dialog to select an image
OpenFileDialog open = new OpenFileDialog();
// Set image file filters to ensure valid image types are opened
open.Filter = "Image Files(*.jpg; *.png; *.jpeg; *.gif; *.bmp)
*.jpg; *.png; *.jpeg; *.gif; *.bmp";
if (open.ShowDialog() == DialogResult.OK) {
// Display image in PictureBox and store file path for later use
pictureBox1.Image = new Bitmap(open.FileName);
// Store image file path in class data member
ImageFileName = open.FileName;
}
' Open file dialog to select an image
Dim open As New OpenFileDialog()
' Set image file filters to ensure valid image types are opened
open.Filter = "Image Files(*.jpg; *.png; *.jpeg; *.gif; *.bmp)
*.jpg; *.png; *.jpeg; *.gif; *.bmp"
If open.ShowDialog() = DialogResult.OK Then
' Display image in PictureBox and store file path for later use
pictureBox1.Image = New Bitmap(open.FileName)
' Store image file path in class data member
ImageFileName = open.FileName
End If
Next, simply type the text in the text box, place this code in the Generate PNG button, and click.
// Generate a QR code with a logo
GeneratedBarcode qrCode = QRCodeWriter.CreateQrCodeWithLogo(textBox1.Text, ImageFileName, 500);
// Save the generated QR code with logo as a PNG file
qrCode.SaveAsPng("QrCodeWithImage.png");
// Generate a QR code with a logo
GeneratedBarcode qrCode = QRCodeWriter.CreateQrCodeWithLogo(textBox1.Text, ImageFileName, 500);
// Save the generated QR code with logo as a PNG file
qrCode.SaveAsPng("QrCodeWithImage.png");
' Generate a QR code with a logo
Dim qrCode As GeneratedBarcode = QRCodeWriter.CreateQrCodeWithLogo(textBox1.Text, ImageFileName, 500)
' Save the generated QR code with logo as a PNG file
qrCode.SaveAsPng("QrCodeWithImage.png")
This code adds the Iron logo to the barcode. It automatically sizes it to an appropriate size where the pure code is still readable and aligns that logo to the QR code square grid so that it looks appropriate.
C# Create QR Code With Logo Image
Finally, the generated QR code can be saved as a PDF or HTML image. The final line of code opens the PDF in your default PDF browser for your convenience. Add the SaveAsPdf
in the Generate PDF button and SaveAsHtmlFile
in the Generate HTML button.
// Generate a QR code with a logo
GeneratedBarcode qrCode = QRCodeWriter.CreateQrCodeWithLogo(textBox1.Text, ImageFileName, 500);
// Save the QR code as a PDF file
qrCode.SaveAsPdf("QRWithLogo.pdf");
// Also, save the QR code as an HTML file
qrCode.SaveAsHtmlFile("QRWithLogo.html");
// Generate a QR code with a logo
GeneratedBarcode qrCode = QRCodeWriter.CreateQrCodeWithLogo(textBox1.Text, ImageFileName, 500);
// Save the QR code as a PDF file
qrCode.SaveAsPdf("QRWithLogo.pdf");
// Also, save the QR code as an HTML file
qrCode.SaveAsHtmlFile("QRWithLogo.html");
' Generate a QR code with a logo
Dim qrCode As GeneratedBarcode = QRCodeWriter.CreateQrCodeWithLogo(textBox1.Text, ImageFileName, 500)
' Save the QR code as a PDF file
qrCode.SaveAsPdf("QRWithLogo.pdf")
' Also, save the QR code as an HTML file
qrCode.SaveAsHtmlFile("QRWithLogo.html")
IronBarcode features a friendly API for developers to read and write data to barcodes and QR codes for C# .NET, optimizing accuracy and ensuring a low error rate in real-world cases. For more information about IronBarcode, please visit this documentation website.
Additionally, IronBarcode also supports reading barcodes from images, as well as providing extra options to read barcodes with more accuracy or apply filters to images.
Currently, if you buy the complete Iron Suite, you can get five libraries for the price of just two. Please visit the pricing page for more details.
This tutorial provides a step-by-step guide on how to create QR codes using the IronBarcode library in C# Windows applications.
The tutorial uses the IronBarcode library, which is known for its powerful and popular features in generating QR codes.
Open Visual Studio, click on 'Create New Project', select 'Windows Forms Application Template', name your project, select your target .NET Framework, and click 'Create'.
You can install the library via the Package Manager Console, NuGet Package Manager Solution, or by downloading the IronBarCode.DLL directly.
The 'IronBarCode' namespace is necessary, along with other system assemblies such as System, System.Drawing, and System.Linq.
Use the 'QRCodeWriter.CreateQrCode' method to generate a QR code from text input and save it as a PNG file.
Yes, you can add a logo using the 'CreateQrCodeWithLogo' method from the 'QRCodeWriter' class by selecting an image from your computer.
Yes, the generated QR code can be saved as a PDF using 'SaveAsPdf' or as an HTML file using 'SaveAsHtmlFile'.
IronBarcode supports reading barcodes from images, providing extra options for greater accuracy, and applying filters to images.
For more information, you can visit the IronBarcode documentation website.