ByteScout Data Extraction Suite – VB.NET – Parallel barcode decoding with barcode reader sdk

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ByteScout Data Extraction Suite – VB.NET – Parallel barcode decoding with barcode reader sdk

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ByteScout-Data-Extraction-Suite-VB-NET-Parallel-barcode-decoding-with-barcode-reader-sdk.pdf

parallel barcode decoding with barcode reader sdk in VB.NET and ByteScout Data Extraction Suite

Simple tutorial on how to do parallel barcode decoding with barcode reader sdk in VB.NET

We regularly create and update our sample code library so you may quickly learn parallel barcode decoding with barcode reader sdk and the step-by-step process in VB.NET. ByteScout Data Extraction Suite helps with parallel barcode decoding with barcode reader sdk in VB.NET. ByteScout Data Extraction Suite is the bundle that includes three SDK tools for data extraction from PDF, scans, images and from spreadsheets: PDF Extractor SDK, Data Extraction SDK, Barcode Reader SDK.

Save time on writing and testing code by using the code below and use it in your application. Follow the steps-by-step instructions from the scratch to work and copy and paste code for VB.NET into your editor. Updated and detailed documentation and tutorials are available along with installed ByteScout Data Extraction Suite if you’d like to learn more about the topic and the details of the API.

Trial version can be downloaded from our website for free. It contains this and other source code samples for VB.NET.

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Module1.vb

      Imports Bytescout.BarCodeReader
Imports System.Threading

Module Module1

    Const InputFile As String = ".\example.pdf"

    ' Limit to 4 threads in queue.
    ' Set this value to number of your processor cores for max performance.
    Dim ThreadLimiter As Semaphore = New Semaphore(4, 4)

    
    <MTAThread()> Sub Main()

        Const numberOfRuns As Integer = 10
        Dim doneEvents(numberOfRuns - 1) As ManualResetEvent

        For i As Integer = 0 To numberOfRuns - 1

            ' Wait for the queue
            ThreadLimiter.WaitOne()

            doneEvents(i) = New ManualResetEvent(False)

            ThreadPool.QueueUserWorkItem(New WaitCallback(AddressOf ThreadProc), New Object() {i, doneEvents(i)})

        Next

        WaitHandle.WaitAll(doneEvents)

        Console.WriteLine("All threads done.")
        Console.WriteLine()

        Console.WriteLine("Press any key to exit...")
        Console.ReadKey()

    End Sub

    Sub ThreadProc(ByVal stateInfo As Object)

        Dim threadIndex As Integer = stateInfo(0)
        Dim waitEvent As ManualResetEvent = stateInfo(1)

        Console.WriteLine("Thread #" & threadIndex & " started...")

        Try

            Dim reader As New Reader()
            reader.RegistrationName = "demo"
            reader.RegistrationKey = "demo"

            ' Set barcode type to find
            reader.BarcodeTypesToFind.Code128 = True

            ' -----------------------------------------------------------------------
            ' NOTE: We can read barcodes from specific page to increase performance .
            ' For sample please refer to "Decoding barcodes from PDF by pages" program.
            ' ----------------------------------------------------------------------- 

            ' Read barcodes
            Dim barcodes As FoundBarcode() = reader.ReadFrom(InputFile)

            ' Cleanup
            reader.Dispose()

            Console.WriteLine("Thread #" & threadIndex & " finished with " & barcodes.Length & " barcodes found.")

        Catch ex As Exception

            Console.WriteLine("Thread #" & threadIndex & " failed with exception:\r\n" & ex.Message)

        Finally

            ' Signal the thread is finished
            waitEvent.Set()

            ' Release semaphore
            ThreadLimiter.Release()

        End Try
        
    End Sub

End Module