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Home > .NET Barcode Reader > .NET Barcode Reading Guide > .NET QR-Code Barcode Reader for C#, VB.NET Applications

.NET QR-Code Barcode Reader for C#, VB.NET Applications

Scan & Read QR-Code barcodes in C#.NET, VB.NET, ASP.NET projects

Easily read & scan QR-Code barcodes in .NET applications
Quickly scan & decode QR Code 2d barcodes from specified area inside the image document
Decoding & reading QR Code barcode images in JPEG, GIF, PNG, BMP, TIFF file formats
100% build in C#.NET, complying with .NET 2.0 and later versions
Complete sample C#.net, VB.net sample codes for Visual C# & VB.NET developers
Mature & reliable QR Code .NET Barcode Reader Component since 2003

Install .NET QR Code Barcode Reader & Scanner

Add BarcodeLib.BarcodeReader.dll to your .NET project reference.

Scan & Read QR-Code Barcodes in C#.NET

Scan and read QR-Code barcode in C# is an easy and simple task. One line of C# code finishes the job.

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

The above C# code will get all QR-Code barcodes in image file "qrcode-barcode.gif".

Scan & Read QR-Code Barcodes in VB.NET

Scan and read QR-Code barcode in VB.NET is an easy and simple task. One line of vb.net code finishes the job.

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

The above VB.NET code will get all QR-Code barcodes in image file "qrcode-barcode.gif".

Optimize QR-Code Barcode Reading Performance in C#.NET & VB.NET

You can customize our .NET barcode reader component, to improve QR-Code barcode reading speed, when you are scanning large image size (like 4mb per image).

Set maxOneBarcodePerPage to true, if there is maximum one barcode per image or per page in tiff or pdf document.
If maxOneBarcodePerPage is true, the .net barcode reader library will stop scanning the barcode immediately, once detects one barcode.
If maxOneBarcodePerPage is false (default value), the library will use total 5 algorithms and each will scan the whole image from 4 directions.
Scan the partial image instead of the whole file.
If the barcode is always located one specified area in the image, you can set and let the library scan that area only. And it will reduce lots of scanning time, CPU and memory usage.
You just 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%)).

The following C# code explains how to scan top 20% of the image and bottom 20% of the image.

     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-barcode.gif", BarcodeReader.QRCODE, setting);

The following VB.NET code explains how to scan top 20% of the image and bottom 20% of the image.

     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-barcode.gif", BarcodeReader.QRCODE, setting)

.NET Barcode Reader & Scanner Supporting Barcode Types/Symbologies

Read .NET 1D Barcodes:

Read .NET 2D Barcodes:

All Decodable Linear Barcodes: Codabar, Code 39, Code 128, Interleaved 2 of 5, EAN 8, EAN 13, UPC-A, UPC-E.

All Decodable Matrix Barcodes: Data Matrix, PDF-417, QR-Code.

Related Barcode Reading & Recogition Guide

How to Read Barcode in C#, VB.NET or ASP.NET:

.NET Barcode Reader, ASP.NET Barcode Reader, C# Barcode Reader, VB.NET Barcode Reader, .NET QR Code Reader SDK, ASP.NET QR Code Reader SDK, C# QR Code Reader SDK, VB.NET QR Code Reader SDK.