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Home > ASP.NET Barcode Scanner > ASP.NET Barcode Decoding Guide > ASP.NET QR Code Reader, Scan QR Code for ASP.NET Program

Read QR Code Using ASP.NET Barcode Reader

How to Scan QR Code 2D barcodes in ASP.NET web service

Complete developer library for QR Code barcode reading for ASP.NET Web application
Fully compiled in C#.NET 2005, compatible with Visual Studio .NET 2.0, 3.0, 3.5, 4.0
Easyily add QR Code recognition functions into ASP.NET web site and ASP.NET web services
Enable ASP.NET barcode developers to read QR Code barcodes using Visual C# or VB.NET codes
Quickly decode and output all QR Code barcodes data string from several image formats
Recognize most popular 1d & 2d barcodes for ASP.NET web barcode decoding project

Add QR Code Recognition DLL to ASP.NET Application

Directly add BarcodeLib.BarcodeReader.dll to your ASP.NET project reference.

Recognize ASP.NET Web Project QR Code Barcodes in C#

You can use the following one line C# demo code to scan and decode all your ASP.NET project QR Code barcodes from a image file.

     string[] results = BarcodeReader.read("c:/qrcode-aspnet.gif", BarcodeReader.QRCODE);

This C# demo code will read all QR Codes in image file "qrcode-aspnet.gif" and return all the barcode data strings.

Recognize ASP.NET Web Project QR Code Barcodes in VB.NET

You can use the following one line VB.NET demo code to read and decode all your ASP.NET project QR Code barcodes from a image file.

     Dim datas() As String = BarcodeReader.read("c:/qrcode-aspnet.gif", BarcodeReader.QRCODE)

The above VB.NET demo code will decode all QR Code barcodes in image file "qrcode-aspnet.gif" and return all the barcode data strings.

Improve ASP.NET QR Code 2D Barcode Scanning Effect

The following settings are needed for reading ASP.NET QR Code barcodes from a large size image file (like 4mb per image).

Read maximum one QR Code barcode: Please set "maxOneBarcodePerPage" to true if there is maximum one QR Code per image, per page in tiff or pdf document.

If this property is true, the process of QR Code recognition will be stopped when our ASP.NET Barcode Reader Library detects one QR Code barcode.

If this property is false (default value), our ASP.NET Barcode Reader Library will use total 5 algorithms and each will read the whole image from 4 directions.
Scan the partial image instead of the whole file: If the QR Code is always appears at a specific area in the image file, you can customize our ASP.NET Barcode Reader Library to read that area only. This will help to reduce lots of reading time, CPU and memory usage.

To do so, please specify the left top point and right bottom point of the area (the point X, Y values are expressed in percentage of the whole image, so image most left top point is (0%, 0%), and most right bottom point is (100%, 100%)). And we provide the following free C# & VB.NET codes to achieve this.

Free C# Sample Code for ASP.NET QR Code Recognition:

     OptimizeSetting setting = new OptimizeSetting();
    
     setting.setMaxOneBarcodePerPage(true);
    
     ScanArea top20 = new ScanArea(new PointF(0.0F, 0.0F), new PointF(100.0F, 20.0F));

     ScanArea bottom20 = new ScanArea(new PointF(0.0F, 80.0F), new PointF(100.0F, 100.0F));
    
     List<ScanArea> areas = new List<ScanArea>();
     areas.Add(top20);
     areas.Add(bottom20);
    
     setting.setAreas(areas);
    
     string[] results = BarcodeReader.read("c:/qrcode-aspnet.gif", BarcodeReader.QRCODE, setting);

Free VB.NET Sample Code for ASP.NET QR Code Recognition:

     Dim setting As OptimizeSetting = New OptimizeSetting()

     setting.setMaxOneBarcodePerPage(True)

     Dim top20 As ScanArea = New ScanArea(New Drawing.PointF(0.0F, 0.0F), New Drawing.PointF(100.0F, 20.0F))

     Dim bottom20 As ScanArea = New ScanArea(New Drawing.PointF(0.0F, 80.0F), New Drawing.PointF(100.0F, 100.0F))

     Dim areas As List(Of ScanArea) = New List(Of ScanArea)
     areas.Add(top20)
     areas.Add(bottom20)

     setting.setAreas(areas)

     Dim datas() As String = BarcodeReader.read("c:/qrcode-aspnet.gif", BarcodeReader.QRCODE, setting)

ASP.NET Linear & 2D Barcodes Reading & Scanning Tutorials

ASP.NET Barcode Reader Component supports the following barcode symbologies, please click to see each detail guide:

All Linear / 1D Barcodes:

All Matrix / 2D Barcodes:

Read Linear Barcodes in ASP.NET Web: ASP.NET Codabar, ASP.NET Code 39, ASP.NET Code 128, ASP.NET Interleaved 2 of 5, ASP.NET EAN-8, ASP.NET EAN-13, ASP.NET UPC-A, ASP.NET UPC-E.

Read 2D Barcodes in ASP.NET Web: ASP.NET Data Matrix, ASP.NET PDF 417, ASP.NET QR Code.

Or, you may directly see developer guide for How to Decode Barcodes in ASP.NET Web Applications.

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