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Home > .NET Barcode Scanner > VB.NET Barcode Scanning Guide > VB.NET UPC-A Barcodes Reader Component, supports VB.NET 2d barcode scanning
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UPC-A VB.NET Barcode Scanner Library DLL

How to Read & Scan UPC-A Barcode Image in VB.NET Project
  • A professional and time-tested UPC-A barcode scanner used for VB.NET program
  • Easy to redistribute and support .NET Framework 2.0, 3.0, 3.5 and greater
  • Wholly written in managed C# class, available for both VB.NET & C# library
  • Read & recognize UPC-A barcode from common image formats & .NET image object
  • Own a special property to read maximum UPC-A barcode in VB.NET applications
  • Support partial UPC-A image recognition by introducing the application of coordinates
Instructions for VB.NET UPC-A Barcode Reading Dll Installation
  1. Download free trial version and integrate BarcodeLib.BarcodeReader.dll to your project reference.
How to Scan UPC-A Barcode Images Using Visual Basic .NET Code
The answer to this question will be illustrated with a concrete example. Suppose you will read & decode all UPC-A barcodes from a gif image "upca-vbnet" in C Drive, and the following free VB.NET code will help you achieve that:
     Dim datas() As String = BarcodeReader.read("c:/upca-vbnet.gif", BarcodeReader.UPCA)
How to Optimize UPC-A Barcode Reading in VB.NET Applications
1. If your target UPC-A barcode is large-size, just activate maxOneBarcodePerPage to true. Then the VB.NET UPC-A barcode scanner will stop reading once it detects one barcode.
Otherwise, this .NET barcode reader will use total 5 algorithms and each will read the whole source image from 4 directions.
2. If your target UPC-A barcode is located in a fixed area, just use the following free VB.NET code. Then the VB.NET UPC-A barcode scanner will only scan your specified area. You can specify the area with four points which are expressed in coordinates.
Note: most left top point is (0%, 0%) and most right bottom point is (100%, 100%).
For example, the UPC-A barcode is located in the area (top 20% and bottom 20%), then the VB.NET codes should be built in following ways:
     Dim setting As OptimizeSetting = New OptimizeSetting()

     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:/upca-vbnet.gif", BarcodeReader.UPCA, setting)
How to Decode Other 1D & 2D Barcode Images in VB.NET Class Library
Decode VB 1D Barcodes:
Decode VB 2D Barcodes:
Use VB to Scan Linear Barcodes: Codabar in VB.NET, Code 39 in VB.NET, Code 128 in VB.NET, Interleaved 2 of 5 in VB.NET, EAN-8 in VB.NET, EAN-13 in VB.NET, UPC-A in VB.NET, UPC-E in VB.NET.

Use VB to Scan Matrix Barcodes: Data Matrix in VB.NET, PDF417 in VB.NET, QR Code in VB.NET.
UPC-A 1D Barcode Recognition Contorls for Related .NET Programs
Want to read & scan UPC-A barcode in other .NET programs? See links below:




.NET Barcode Scanner Control, ASP.NET Barcode Scanner Control, C# Barcode Scanner Control, VB.NET Barcode Scanner Control, .NET UPC-A Scanner Control, ASP.NET UPC-A Scanner Control, C# UPC-A Scanner Control, VB.NET UPC-A Scanner Control.
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