BarcodeGenerator.ExportToImageAsync(Byte[], DXImageFormat) Method

Asynchronously generates a barcode image for the specified binary data.

Namespace: DevExpress.Docs.Barcode

Assembly: DevExpress.Docs.Barcode.v26.1.dll

Declaration

C#

public Task<DXImage> ExportToImageAsync(
    byte[] binaryData,
    DXImageFormat format
)

VB.NET

Public Function ExportToImageAsync(
    binaryData As Byte(),
    format As DXImageFormat
) As Task(Of DXImage)

Parameters

Name	Type	Description
binaryData	Byte[]	The binary data to encode as a barcode.
format	DXImageFormat	The format of the generated image.

Returns

Type	Description
Task<DXImage>	A task that represents the asynchronous operation. The result contains the generated barcode image.

Remarks

The following code snippet encodes binary data to a QR code and exports it as a PNG image asynchronously using the DXImage class:

C#

using DevExpress.Docs;
using DevExpress.Docs.Barcode;
using DevExpress.Drawing;
using System.Drawing;

namespace ConsoleApp1;

public class Program {
    public static async Task Main(string[] _) {

        // Configure QR code options.
        QRCodeOptions qrOptions = new QRCodeOptions {
            ErrorCorrectionLevel = QRCodeErrorCorrectionLevel.H,
            CompactionMode = QRCodeCompactionMode.Auto,
            IncludeQuietZone = false,
            Version = QRCodeVersion.Version10,
            ModuleSize = 40,
            BackColor = Color.LightGray,
            ShowText = false,
            Padding = new Padding(5),
            BorderWidth = 1,
            BorderColor = Color.Blue,
            Width = 500,
            Height = 500,
        };

        // Create binary data to encode.
        byte[] data = { 0x48, 0x65, 0x6C, 0x6C, 0x6F };

        using (BarcodeGenerator generator = new BarcodeGenerator(qrOptions)) {

            // Export binary data as a barcode image asynchronously.
            DXImage image = await generator.ExportToImageAsync(data, DXImageFormat.Png);
            // Save the barcode image to a file.
            using (FileStream stream = new FileStream("D:\\qrcode.png", FileMode.Create, FileAccess.Write)) {
                image.Save(stream);
            }
        }
    }
}

VB.NET

Imports DevExpress.Docs
Imports DevExpress.Docs.Barcode
Imports DevExpress.Drawing
Imports System.Drawing

Namespace ConsoleApp1

    Public Class Program
        Public Shared Async Function Main(args As String()) As Task

            ' Configure QR code options.
            Dim qrOptions As New QRCodeOptions With {
                .ErrorCorrectionLevel = QRCodeErrorCorrectionLevel.H,
                .CompactionMode = QRCodeCompactionMode.Auto,
                .IncludeQuietZone = False,
                .Version = QRCodeVersion.Version10,
                .ModuleSize = 40,
                .BackColor = Color.LightGray,
                .ShowText = False,
                .Padding = New Padding(5),
                .BorderWidth = 1,
                .BorderColor = Color.Blue,
                .Width = 500,
                .Height = 500
            }

            ' Create binary data to encode.
            Dim data As Byte() = {&H48, &H65, &H6C, &H6C, &H6F}

            Using generator As New BarcodeGenerator(qrOptions)

                ' Export binary data as a barcode image asynchronously.
                Dim image As DXImage = Await generator.ExportToImageAsync(data, DXImageFormat.Png)
                ' Save the barcode image to a file.
                Using stream As New FileStream("D:\qrcode.png", FileMode.Create, FileAccess.Write)
                    image.Save(stream)
                End Using
            End Using
        End Function
    End Class
End Namespace