Cómo Hacer un Código QR para un Enlace (Tutorial de C#)

IronBarcode allows us to create a QR code with a few lines of code. Use the QRCodeWriter.CreateQrCode method to create a new QR code as shown in the following code:

using IronBarCode;

// Create a QR code with a specified URL and dimensions,
// and save it as a PNG file.
QRCodeWriter.CreateQrCode("www.google.com", 500, QRCodeWriter.QrErrorCorrectionLevel.Medium, 0).SaveAsPng("NewQR.png");

using IronBarCode;

// Create a QR code with a specified URL and dimensions,
// and save it as a PNG file.
QRCodeWriter.CreateQrCode("www.google.com", 500, QRCodeWriter.QrErrorCorrectionLevel.Medium, 0).SaveAsPng("NewQR.png");

Imports IronBarCode

' Create a QR code with a specified URL and dimensions,
' and save it as a PNG file.
QRCodeWriter.CreateQrCode("www.google.com", 500, QRCodeWriter.QrErrorCorrectionLevel.Medium, 0).SaveAsPng("NewQR.png")

The data to be encoded in the code image (which might be a URL or a Stream) is the only mandatory parameter for the CreateQrCode method. Additionally, the method takes three optional parameters:

• The graphic's default dimensions are 500 pixels wide by 500 pixels high.
• An error correction level. Low, Medium, High, and Highest are the four levels of error correction offered by IronBarcode. The CreateQrCode method by default uses the highest level of correction (QRCodeWriter.QrErrorCorrectionLevel.Highest).
• The version number of the QR code. For a list of acceptable variations, visit this page. The method is told to use the right version number based on the data it will encode if the value is 0 (the default value).

The sample above uses the medium level of error correction to produce a 500 by 500 pixel graphic that creates a custom QR code. Next, we can save the generated QR codes as a PNG file at a specified file location by calling the SaveAsPng method.

We'll then look at an example of a use-case where a user or business wants to add a company logo to a generated QR code. To accomplish this, the QrCodeWriter.CreateQrCodeWithLogo method is used in the example code below.

using System.Drawing; // Necessary for Color type

// Create a QR code with a logo included.
var QRWithLogo = QRCodeWriter.CreateQrCodeWithLogo("www.google.com", "qrWithlogo.png", 500);

// Customize the color of the QR code using the ChangeBarCodeColor method.
QRWithLogo.ChangeBarCodeColor(Color.DarkRed);

// Save the customized QR code as a new PNG file.
QRWithLogo.SaveAsPng("NewQR_Code.png");

using System.Drawing; // Necessary for Color type

// Create a QR code with a logo included.
var QRWithLogo = QRCodeWriter.CreateQrCodeWithLogo("www.google.com", "qrWithlogo.png", 500);

// Customize the color of the QR code using the ChangeBarCodeColor method.
QRWithLogo.ChangeBarCodeColor(Color.DarkRed);

// Save the customized QR code as a new PNG file.
QRWithLogo.SaveAsPng("NewQR_Code.png");

Imports System.Drawing ' Necessary for Color type

' Create a QR code with a logo included.
Private QRWithLogo = QRCodeWriter.CreateQrCodeWithLogo("www.google.com", "qrWithlogo.png", 500)

' Customize the color of the QR code using the ChangeBarCodeColor method.
QRWithLogo.ChangeBarCodeColor(Color.DarkRed)

' Save the customized QR code as a new PNG file.
QRWithLogo.SaveAsPng("NewQR_Code.png")

In the above example, we encoded the string value of the URL "www.google.com" into a new QR code that embeds an image from that website into a given file location.

Graphics are included in the QR code above. The logo is automatically positioned to that size and sized to match the QR code square grid so that the pure code can still be read. We can also customize the color of the QR address bar code using the ChangeBarCodeColor method, which offers a range of code colors we can use on the QR code. One uses Color-class-types, while the other makes use of HTML hex color notation as follows:

QRWithLogo.ChangeBarCodeColor(System.Drawing.ColorTranslator.FromHtml("#8B0000"));

QRWithLogo.ChangeBarCodeColor(System.Drawing.ColorTranslator.FromHtml("#8B0000"));

QRWithLogo.ChangeBarCodeColor(System.Drawing.ColorTranslator.FromHtml("#8B0000"))

The above line of code specifies the dark red color of the barcode. Then, as the code instructs, we save it as a PNG file. We can also save QR codes in other file formats such as HTML:

QRWithLogo.SaveAsHtmlFile("test.html");

QRWithLogo.SaveAsHtmlFile("test.html");

QRWithLogo.SaveAsHtmlFile("test.html")

The outcome of the source code above is displayed in the image below.

QR codes can be saved in other file formats such as HTML:

QRWithLogo.SaveAsHtmlFile("test.html");

QRWithLogo.SaveAsHtmlFile("test.html");

QRWithLogo.SaveAsHtmlFile("test.html")

Using IronBarcode QR Code generator website

IronBarcode can be used in web applications as well. The MVC Dot Net core 6.0 sample code is provided below.

public IActionResult Index()
{
    // Generate a QR code for www.google.com
    var barcode = QRCodeWriter.CreateQrCode("www.google.com", 500, QRCodeWriter.QrErrorCorrectionLevel.Medium, 0);

    // Save the QR code as a PNG file
    barcode.SaveAsPng("Barcode.png");

    // Get the file path to the saved QR code
    var filePath = Path.Combine(Directory.GetCurrentDirectory(), "Barcode.png");

    // Return the file as a physical file result to be downloaded
    return PhysicalFile(filePath, "image/png", "Barcode.png");
}

public IActionResult Index()
{
    // Generate a QR code for www.google.com
    var barcode = QRCodeWriter.CreateQrCode("www.google.com", 500, QRCodeWriter.QrErrorCorrectionLevel.Medium, 0);

    // Save the QR code as a PNG file
    barcode.SaveAsPng("Barcode.png");

    // Get the file path to the saved QR code
    var filePath = Path.Combine(Directory.GetCurrentDirectory(), "Barcode.png");

    // Return the file as a physical file result to be downloaded
    return PhysicalFile(filePath, "image/png", "Barcode.png");
}

Public Function Index() As IActionResult
	' Generate a QR code for www.google.com
	Dim barcode = QRCodeWriter.CreateQrCode("www.google.com", 500, QRCodeWriter.QrErrorCorrectionLevel.Medium, 0)

	' Save the QR code as a PNG file
	barcode.SaveAsPng("Barcode.png")

	' Get the file path to the saved QR code
	Dim filePath = Path.Combine(Directory.GetCurrentDirectory(), "Barcode.png")

	' Return the file as a physical file result to be downloaded
	Return PhysicalFile(filePath, "image/png", "Barcode.png")
End Function

The code that we used for the Windows/console program is the same as the one that is provided above. The above code first generates a QR code file before returning it. Then QR code can be downloaded by the user as a PNG file. We can also make it available for use on mobile devices and online forms.

For more code tutorials for IronBarcode click here.