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

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

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parallel barcode decoding with barcode reader sdk in VB.NET using ByteScout Premium Suite

parallel barcode decoding with barcode reader sdk in VB.NET

These source code samples are assembled by their programming language and functions they use. ByteScout Premium Suite helps with parallel barcode decoding with barcode reader sdk in VB.NET. ByteScout Premium Suite is the bundle that includes twelve SDK products from ByteScout including tools and components for PDF, barcodes, spreadsheets, screen video recording.

If you want to quickly learn then these fast application programming interfaces of ByteScout Premium Suite for VB.NET plus the guideline and the VB.NET code below will help you quickly learn parallel barcode decoding with barcode reader sdk. If you want to implement this functionality, you should copy and paste code below into your app using code editor. Then compile and run your application. These VB.NET sample examples can be used in one or many applications.

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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