Convert PDF to Text in Multi-thread mode using C# and .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)
        {
            // Before starting, we recommend to get a free 100-day key:
            // https://sautinsoft.com/start-for-free/
            
            // Apply the key here:
            // SautinSoft.PdfFocus.SetLicense("...");
			
            ConvertPdfToTextInThread();
        }
        public class TArgument
        {
            public string PdfFile { get; set; }
            public int PageNumber { get; set; }
        }
        public static void ConvertPdfToTextInThread()
        {
            string pdfs = Path.GetFullPath(@"..\..\..\");
            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!");
        }

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

            string textFile = Path.GetFileNameWithoutExtension(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));
                System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(textFile) { UseShellExecute = true });
            }
            else
                Console.WriteLine("{0}\t - Error!", Path.GetFileName(pdfFile));
        }
    }
}

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

Module Sample

    Sub Main()
		' Before starting, we recommend to get a free 100-day key:
		' https://sautinsoft.com/start-for-free/

		' Apply the key here
		' SautinSoft.PdfFocus.SetLicense("...");

        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 = Path.GetFullPath("..\..\..\")
        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!")
    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.GetFileNameWithoutExtension(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))
            System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(textFile) With {.UseShellExecute = True})
        Else
            Console.WriteLine("{0}" & ControlChars.Tab & " - Error!", Path.GetFileName(pdfFile))
        End If
    End Sub
End Module

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