RPA Robotic Process Automation - Make Large PDF Document Searchable Using Parallel Processing - C# - ByteScout

RPA Robotic Process Automation – Make Large PDF Document Searchable Using Parallel Processing – C#

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How to make large PDF document searchable using parallel processing in C# with ByteScout Robotic Process Automation

What is ByteScout Robotic Process Automation? It is set of integrated APIs for quick replaccement of manual data processing with robotic process automations.

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MultithreadProcessing.csproj

      
<?xml version="1.0" encoding="utf-8"?> <Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" /> <PropertyGroup> <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration> <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform> <ProjectGuid>{0B102DA4-C143-481D-A076-1F56E3CB1CF5}</ProjectGuid> <OutputType>Exe</OutputType> <RootNamespace>MultithreadProcessing</RootNamespace> <AssemblyName>MultithreadProcessing</AssemblyName> <TargetFrameworkVersion>v4.0</TargetFrameworkVersion> <FileAlignment>512</FileAlignment> </PropertyGroup> <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' "> <PlatformTarget>AnyCPU</PlatformTarget> <DebugSymbols>true</DebugSymbols> <DebugType>full</DebugType> <Optimize>false</Optimize> <OutputPath>bin\Debug\</OutputPath> <DefineConstants>DEBUG;TRACE</DefineConstants> <ErrorReport>prompt</ErrorReport> <WarningLevel>4</WarningLevel> </PropertyGroup> <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' "> <PlatformTarget>AnyCPU</PlatformTarget> <DebugType>pdbonly</DebugType> <Optimize>true</Optimize> <OutputPath>bin\Release\</OutputPath> <DefineConstants>TRACE</DefineConstants> <ErrorReport>prompt</ErrorReport> <WarningLevel>4</WarningLevel> </PropertyGroup> <ItemGroup> <Reference Include="Bytescout.PDFExtractor, Version=8.6.0.2917, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> <HintPath>C:\Program Files\Bytescout PDF Extractor SDK\net4.00\Bytescout.PDFExtractor.dll</HintPath> </Reference> <Reference Include="Bytescout.PDFExtractor.OCRExtension, Version=8.6.0.2917, Culture=neutral, PublicKeyToken=f7dd1bd9d40a50eb, processorArchitecture=MSIL"> <SpecificVersion>False</SpecificVersion> <HintPath>C:\Program Files\Bytescout PDF Extractor SDK\net4.00\Bytescout.PDFExtractor.OCRExtension.dll</HintPath> </Reference> <Reference Include="System" /> <Reference Include="System.Core" /> <Reference Include="System.Xml.Linq" /> <Reference Include="System.Data" /> <Reference Include="System.Xml" /> </ItemGroup> <ItemGroup> <Compile Include="Program.cs" /> <Compile Include="Properties\AssemblyInfo.cs" /> </ItemGroup> <ItemGroup> <Content Include="sample.pdf"> <CopyToOutputDirectory>Always</CopyToOutputDirectory> </Content> </ItemGroup> <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" /> </Project>

MultithreadProcessing.sln

      
Microsoft Visual Studio Solution File, Format Version 12.00 # Visual Studio 15 VisualStudioVersion = 15.0.26730.10 MinimumVisualStudioVersion = 10.0.40219.1 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MultithreadProcessing", "MultithreadProcessing.csproj", "{0B102DA4-C143-481D-A076-1F56E3CB1CF5}" EndProject Global GlobalSection(SolutionConfigurationPlatforms) = preSolution Debug|Any CPU = Debug|Any CPU Release|Any CPU = Release|Any CPU EndGlobalSection GlobalSection(ProjectConfigurationPlatforms) = postSolution {0B102DA4-C143-481D-A076-1F56E3CB1CF5}.Debug|Any CPU.ActiveCfg = Debug|Any CPU {0B102DA4-C143-481D-A076-1F56E3CB1CF5}.Debug|Any CPU.Build.0 = Debug|Any CPU {0B102DA4-C143-481D-A076-1F56E3CB1CF5}.Release|Any CPU.ActiveCfg = Release|Any CPU {0B102DA4-C143-481D-A076-1F56E3CB1CF5}.Release|Any CPU.Build.0 = Release|Any CPU EndGlobalSection GlobalSection(SolutionProperties) = preSolution HideSolutionNode = FALSE EndGlobalSection GlobalSection(ExtensibilityGlobals) = postSolution SolutionGuid = {50466307-7059-438B-8545-42FDA71BC1A6} EndGlobalSection EndGlobal

Program.cs

      
using System; using System.Diagnostics; using System.IO; using System.Threading; using Bytescout.PDFExtractor; namespace MultithreadProcessing { class Program { // Limit to 4 threads in queue. // Set this value to number of your processor cores for max performance. private static readonly Semaphore ThreadLimiter = new Semaphore(4, 4); static void Main(string[] args) { const string inputFile = "sample.pdf"; const string resultFile = "result.pdf"; int pageCount; // Get document page count using (var infoExtractor = new InfoExtractor("demo", "demo")) { infoExtractor.LoadDocumentFromFile(inputFile); pageCount = infoExtractor.GetPageCount(); } // Process the document by 10-page pieces int numberOfThreads = pageCount / 10; if (pageCount - numberOfThreads * 10 > 0) numberOfThreads += 1; WaitHandle[] doneEvents = new WaitHandle[numberOfThreads]; Stopwatch stopwatch = Stopwatch.StartNew(); int startPage, endPage; string[] pieces = new string[numberOfThreads]; for (int i = 0; i < numberOfThreads; i++) { // Wait for the queue ThreadLimiter.WaitOne(); doneEvents[i] = new ManualResetEvent(false); startPage = i * 10; endPage = Math.Min(pageCount - 1, (i + 1) * 10 - 1); pieces[i] = string.Format("temp-{0}-{1}.pdf", startPage, endPage); ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadProc), new object[] { i, doneEvents[i], inputFile, pieces[i], startPage, endPage }); } // Wait for all threads WaitHandle.WaitAll(doneEvents); // Merge pieces using (DocumentMerger merger = new DocumentMerger("demo", "demo")) merger.Merge(pieces, resultFile); // Delete temp files foreach (string tempFile in pieces) File.Delete(tempFile); Console.WriteLine("All done in {0}.", stopwatch.Elapsed); Console.WriteLine(); Console.WriteLine("Press any key to exit..."); Console.ReadKey(); } private static void ThreadProc(object stateInfo) { int threadIndex = (int) ((object[]) stateInfo)[0]; ManualResetEvent doneEvent = (ManualResetEvent) ((object[]) stateInfo)[1]; string inputFile = (string) ((object[]) stateInfo)[2]; string outputFile = (string)((object[])stateInfo)[3]; int startPage = (int)((object[])stateInfo)[4]; int endPage = (int)((object[])stateInfo)[5]; try { Console.WriteLine("Thread #{0} started with the page range from {1} to {2}.", threadIndex, startPage, endPage); Stopwatch stopwatch = Stopwatch.StartNew(); // Extract a piece of document string chunk = string.Format("temp-{0}-{1}", startPage, endPage); using (DocumentSplitter splitter = new DocumentSplitter("demo", "demo")) splitter.ExtractPageRange(inputFile, chunk, startPage + 1, endPage + 1); // Process the piece using (SearchablePDFMaker searchablePdfMaker = new SearchablePDFMaker("demo", "demo")) { searchablePdfMaker.OCRDetectPageRotation = true; searchablePdfMaker.OCRLanguageDataFolder = @"C:\Program Files\Bytescout PDF Extractor SDK\net4.00\tessdata"; searchablePdfMaker.LoadDocumentFromFile(chunk); // 300 DPI resolution is recommended. // Using of higher values will slow down the processing but does not guarantee the higher quality. searchablePdfMaker.OCRResolution = 300; searchablePdfMaker.MakePDFSearchable(outputFile); } File.Delete(chunk); Console.WriteLine("Thread #{0} finished in {1}.", threadIndex, stopwatch.Elapsed); } finally { // Signal the thread is finished doneEvent.Set(); // Release semaphore ThreadLimiter.Release(); } } } }

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