Convert PDF to Text in Multi-thread mode
using C# and VB.NET


Complete code.

using System;
using System.IO;
using System.Collections.Generic;
using System.Threading;
using SautinSoft;

namespace Sample
{
    class Sample
    {
        static void Main(string[] args)
        {
            ConvertPdfToTextInThread();
        }
        public class TArgument
        {
            public string PdfFile { get; set; }
            public int PageNumber { get; set; }
        }
        public static void ConvertPdfToTextInThread()
        {
            string pdfs = @"..\..\";
            string[] files = Directory.GetFiles(pdfs, "*.pdf");

            List<Thread> threads = new List<Thread>();
            for (int i = 0; i < files.Length; i++)
            {
                TArgument targ = new TArgument()
                {
                    PdfFile = files[i],
                    PageNumber = 1
                };

                var t = new Thread((a) => ConvertToText(a));
                t.Start(targ);
                threads.Add(t);
            }

            foreach (var thread in threads)
                thread.Join();
            Console.WriteLine("Done.");
            Console.ReadLine();
        }

        public static void ConvertToText(object targ)
        {
            TArgument targum = (TArgument)targ;
            string pdfFile = targum.PdfFile;
            int page = targum.PageNumber;

            string textFile = Path.ChangeExtension(pdfFile, ".txt");

            SautinSoft.PdfFocus f = new SautinSoft.PdfFocus();

            f.WordOptions.ShowInvisibleText = true;
                        
            f.OpenPdf(pdfFile);

            bool done = false;

            if (f.PageCount > 0)
            {
                if (page >= f.PageCount)
                    page = 1;

                if (f.ToText(textFile, page, page) == 0)
                    done = true;
                f.ClosePdf();
            }

            if (done)
                Console.WriteLine("{0}\t - Done!", Path.GetFileName(pdfFile));
            else
                Console.WriteLine("{0}\t - Error!", Path.GetFileName(pdfFile));
        }
    }
}

Download.

        
            Imports System.IO
Imports System.Drawing.Imaging
Imports System.Collections.Generic
Imports System.Threading
Imports SautinSoft

Module Sample

    Sub Main()
        ConvertPdfToTextInThread()
    End Sub
    Public Class TArgument
        Public Property PdfFile() As String
        Public Property PageNumber() As Integer
    End Class
    Public Sub ConvertPdfToTextInThread()
        Dim pdfs As String = "..\"
        Dim files() As String = Directory.GetFiles(pdfs, "*.pdf")

        Dim threads As New List(Of Thread)()
        For i As Integer = 0 To files.Length - 1
            Dim targ As New TArgument() With {
                .PdfFile = files(i),
                .PageNumber = 1
            }

            Dim t = New Thread(Sub(a) ConvertToText(a))
            t.Start(targ)
            threads.Add(t)
        Next i

        For Each t As Thread In threads
            t.Join()
        Next t
        Console.WriteLine("Done.")
        Console.ReadLine()
    End Sub

    Public Sub ConvertToText(ByVal targ As Object)
        Dim targum As TArgument = DirectCast(targ, TArgument)
        Dim pdfFile As String = targum.PdfFile
        Dim page As Integer = targum.PageNumber

        Dim textFile As String = Path.ChangeExtension(pdfFile, ".txt")

        Dim f As New SautinSoft.PdfFocus()

        f.WordOptions.ShowInvisibleText = True

        f.OpenPdf(pdfFile)

        Dim done As Boolean = False

        If f.PageCount > 0 Then
            If page >= f.PageCount Then
                page = 1
            End If

            If f.ToText(textFile, page, page) = 0 Then
                done = True
            End If
            f.ClosePdf()
        End If

        If done Then
            Console.WriteLine("{0}" & ControlChars.Tab & " - Done!", Path.GetFileName(pdfFile))
        Else
            Console.WriteLine("{0}" & ControlChars.Tab & " - Error!", Path.GetFileName(pdfFile))
        End If
    End Sub
End Module

Download.

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