.NET Barcode Reader: VB.NET Guide

Just imagine there are many barcodes on your image source and you may do not know the exact bar code type for each. Then, you may use the following three .NET APIs. And barcode reading work in VB.NET programming will be accomplished easily.

Public Shared FunctionScan(bitmap As Bitmap) As BarcodeResult()
EndFunction
Public Shared FunctionScan(stream As Stream) As BarcodeResult()
EndFunction
Public Shared FunctionScan(filename As String) As BarcodeResult()
EndFunction

On the contrary, if you know your target barcode type, there's no need for recognizing all barcodes from your image file. Instead, to save the time of reading barcode in VB.NET application, you may try these APIs as below. As you see, before running VB.NET project, you can define a target barcode type and direct our .NET barcode scanner dll to read them all from image.

Public Shared FunctionScan(bitmap As Bitmap, barType As BarCodeType) As BarcodeResult()
EndFunction
Public Shared FunctionScan(stream As Stream, barType As BarCodeType) As BarcodeResult()
EndFunction
Public Shared FunctionScan(filename As String, barType As BarCodeType) As BarcodeResult()
EndFunction

With above APIs, you can easily read and decode more than 10 linear and 2d bar codes from image files in Visual Studio VB.NET project. Please see respective guide page from the right menu bar (under Barcode Type section).

If you want to test all bar codes decoding feature in VB.NET program, please download free trial package of Barcode Recognition Software for .NET online. And this part only gives you two examples of scanning barcodes from image in bitmap form using VB.NET programming language.

VB Code: How to Read All Barcode Types

Public Sub ScanAllTypeBarcode(bmp As Bitmap)
Dim results As BarcodeResult() = BarCodeScanner.Scan(bmp)
For Each result As BarcodeResult In results
Console.WriteLine((result.BarType.ToString() & "-") + result.Data)
Next
End Sub

VB Code: How to Read Certain Barcode Type

Public Sub ScanSpecifiedTypeBarcode(bmp As Bitmap)
Dim results As BarcodeResult() = BarCodeScanner.Scan(bmp, BarCodeType.Code128)
For Each result As BarcodeResult In results
Console.WriteLine((result.BarType.ToString() & "-") + result.Data)
Next
End Sub

VB Code: How to Read Only One Barcode from Image

' This can improve barcode recognition accuracy. It's suitable when there's only one barcode on image.
Dim bmp As Bitmap =  New Bitmap("YourImagePath")
Dim barcode As BarcodeResult =  BarCodeScanner.ScanSingle(bmp)
Console.WriteLine("barcode data:{0}.", barcode.Data)