QR Code

• Oct 29, 2018
• 3 minutes to read

Short Description

A QR Code (QR is the abbreviation for Quick Response) is a two-dimensional code, readable by QR scanners, mobile phones with a camera, and smartphones. QR Code can encode textual, numeric and binary data.

Bar Code Properties

The type of a bar code control’s Symbology property is QRCodeGenerator.

The following properties are specific to the QR type.

• XRBarCode.AutoModule/BarCodeControl.AutoModule

  Gets or sets whether the Module property value should be calculated automatically based upon the barcode’s size.

• QRCodeGenerator.CompactionMode

  Gets or sets whether numeric, alpha-numeric or byte information should be used as the bar code’s data.

• QRCodeGenerator.ErrorCorrectionLevel

  Gets or sets the amount of redundancy built into the bar code’s coding, to compensate for calculation errors.

• QRCodeGenerator.Version

  Gets or sets the bar code’s size.

• QRCodeGenerator.Logo

  Specifies the image that overlays the QR code.

Examples

The following code creates a QR Code bar code and specifies its main properties.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-add-a-bar-code-to-a-report-e167.

Form1.cs

using System;
using System.Collections.Generic;
using System.Drawing.Printing;
using System.Windows.Forms;
using DevExpress.XtraPrinting.BarCode;
using DevExpress.XtraReports.UI;
// ...
public XRBarCode CreateQRCodeBarCode(string BarCodeText) {
    // Create a bar code control.
    XRBarCode barCode = new XRBarCode();

    // Set the bar code's type to QRCode.
    barCode.Symbology = new QRCodeGenerator();

    // Adjust the bar code's main properties.
    barCode.Text = BarCodeText;
    barCode.Width = 400;
    barCode.Height = 150;

    // If the AutoModule property is set to false, uncomment the next line.
    barCode.AutoModule = true;
    // barcode.Module = 3;

    // Adjust the properties specific to the bar code type.
    ((QRCodeGenerator)barCode.Symbology).CompactionMode = QRCodeCompactionMode.AlphaNumeric;
    ((QRCodeGenerator)barCode.Symbology).ErrorCorrectionLevel = QRCodeErrorCorrectionLevel.H;
    ((QRCodeGenerator)barCode.Symbology).Version = QRCodeVersion.AutoVersion;

    return barCode;
}

Form1.vb

Imports System
Imports System.Collections.Generic
Imports System.Drawing.Printing
Imports System.Windows.Forms
Imports DevExpress.XtraPrinting.BarCode
Imports DevExpress.XtraReports.UI
' ...
Public Function CreateQRCodeBarCode(ByVal BarCodeText As String) As XRBarCode
    ' Create a bar code control.
    Dim barCode As New XRBarCode()

    ' Set the bar code's type to QRCode.
    barCode.Symbology = New QRCodeGenerator()

    ' Adjust the bar code's main properties.
    barCode.Text = BarCodeText
    barCode.Width = 400
    barCode.Height = 150

    ' If the AutoModule property is set to false, uncomment the next line.
    barCode.AutoModule = True
    ' barcode.Module = 3;

    ' Adjust the properties specific to the bar code type.
    CType(barCode.Symbology, QRCodeGenerator).CompactionMode = QRCodeCompactionMode.AlphaNumeric
    CType(barCode.Symbology, QRCodeGenerator).ErrorCorrectionLevel = QRCodeErrorCorrectionLevel.H
    CType(barCode.Symbology, QRCodeGenerator).Version = QRCodeVersion.AutoVersion

    Return barCode
End Function

To add the XRBarCode to a report band, handle the report’s XRControl.BeforePrint event.

C#

using System.Drawing.Printing;
// ...

private void XtraReport1_BeforePrint(object sender, PrintEventArgs e) {
    this.Detail.Controls.Add(CreateQRCodeBarCode("012345678"));
}

VB.NET

Imports System.Drawing.Printing
' ...

Private Sub XtraReport1_BeforePrint(ByVal sender As Object, ByVal e As PrintEventArgs)
    Me.Detail.Controls.Add(CreateQRCodeBarCode("012345678"))
End Sub