ByteScout Premium Suite – VB.NET – Parallel processing of pdf files with pdf extractor sdk

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ByteScout Premium Suite – VB.NET – Parallel processing of pdf files with pdf extractor sdk

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parallel processing of pdf files with pdf extractor sdk in VB.NET with ByteScout Premium Suite

Learn to code in VB.NET to make parallel processing of pdf files with pdf extractor sdk with this simple How-To tutorial

Writing of the code to parallel processing of pdf files with pdf extractor sdk in VB.NET can be done by developers of any level using ByteScout Premium Suite. ByteScout Premium Suite was made to help with parallel processing of pdf files with pdf extractor 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.

Save time on writing and testing code by using the code below and use it in your application. If you want to know how it works, then this VB.NET sample code should be copied and pasted into your application’s code editor. Then just compile and run it. Further improvement of the code will make it more robust.

On our website you may get trial version of ByteScout Premium Suite for free. Source code samples are included to help you with your VB.NET application.

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Module1.vb

      Imports System.IO
Imports System.Threading
Imports Bytescout.PDFExtractor

Module Module1

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

    <MTAThread()>
    Sub Main()

        ' Get all PDF files in a folder
        Dim files = Directory.GetFiles("..\..\..\..\", "*.pdf")
        ' Array of events to wait
        Dim doneEvents(files.Length - 1) As ManualResetEvent

        For i As Integer = 0 To files.Length - 1

            ' Wait for the queue
            ThreadLimiter.WaitOne()

            ' Start thread with filename and event in params
            doneEvents(i) = New ManualResetEvent(False)
            Dim threadData As Object = New Object() {files(i), doneEvents(i)}
            ThreadPool.QueueUserWorkItem(AddressOf ConvertPdfToTxt, threadData)

        Next

        ' Wait until all threads finish
        WaitHandle.WaitAll(doneEvents)

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

    End Sub

    Private Sub ConvertPdfToTxt(ByVal state As Object)

        ' Get filename and event from params
        Dim file As String = state(0)
        Dim doneEvent As ManualResetEvent = state(1)

        Dim resultFileName = Path.GetFileName(file) + ".txt"

        Try

            Console.WriteLine("Converting " + file)

            Using extractor As New TextExtractor("demo", "demo")

                extractor.LoadDocumentFromFile(file)
                extractor.SaveTextToFile(resultFileName)

            End Using

            Console.WriteLine("Finished " + resultFileName)

        Finally

            ' Signal the thread is finished
            doneEvent.Set()
            ' Release semaphore
            ThreadLimiter.Release()

        End Try

    End Sub

End Module