898833 - added sample for the extracting text using OCR

How-to/How-to-extract-Text-using-OCR/ExtractingSample/WinForms_TextExtractionByOCR.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.12.35707.178 d17.12
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WinForms_TextExtractionByOCR", "WinForms_TextExtractionByOCR\WinForms_TextExtractionByOCR.csproj", "{1B09455E-6F67-4155-AFE2-EB421BAB1190}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{1B09455E-6F67-4155-AFE2-EB421BAB1190}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1B09455E-6F67-4155-AFE2-EB421BAB1190}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1B09455E-6F67-4155-AFE2-EB421BAB1190}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1B09455E-6F67-4155-AFE2-EB421BAB1190}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

How-to/How-to-extract-Text-using-OCR/ExtractingSample/WinForms_TextExtractionByOCR/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8" />
+    </startup>
+</configuration>

How-to/How-to-extract-Text-using-OCR/ExtractingSample/WinForms_TextExtractionByOCR/Form1.cs

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+using Syncfusion.Windows.PdfViewer;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using System.Windows.Forms.Integration;
+
+namespace WinForms_TextExtractionByOCR
+{
+    public partial class Form1 : Form
+    {
+        ElementHost elementHost = new ElementHost();
+        PdfViewer pdfViewer;
+        public Form1()
+        {
+            InitializeComponent();
+            this.WindowState = FormWindowState.Maximized;
+            pdfViewer = new PdfViewer();
+            elementHost.Dock = DockStyle.Fill;
+            elementHost.Child = pdfViewer;
+            this.Controls.Add(elementHost);
+
+        }
+    }
+}

How-to/How-to-extract-Text-using-OCR/ExtractingSample/WinForms_TextExtractionByOCR/PdfViewer.xaml

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+<UserControl xmlns:PdfViewer="clr-namespace:Syncfusion.Windows.PdfViewer;assembly=Syncfusion.PdfViewer.WPF"
+             x:Class="WinForms_TextExtractionByOCR.PdfViewer" 
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
+             xmlns:local="clr-namespace:WinForms_TextExtractionByOCR"
+             mc:Ignorable="d" 
+             d:DesignHeight="450" d:DesignWidth="800">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="30"/>
+            <RowDefinition/>
+        </Grid.RowDefinitions>
+        <Button x:Name="Rectangle" Content="Mark and Extract" Width="60" Click="Rectangle_Click"/>
+        <PdfViewer:PdfViewerControl Grid.Row="1" x:Name="pdfViewer"/>
+    </Grid>
+</UserControl>

How-to/How-to-extract-Text-using-OCR/ExtractingSample/WinForms_TextExtractionByOCR/PdfViewer.xaml.cs

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+using Syncfusion.OCRProcessor;
+using Syncfusion.Pdf.Parsing;
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Drawing.Imaging;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace WinForms_TextExtractionByOCR
+{
+    /// <summary>
+    /// Interaction logic for PdfViewer.xaml
+    /// </summary>
+    public partial class PdfViewer : UserControl
+    {
+        RectangleF bounds;
+        public PdfViewer()
+        {
+            InitializeComponent();
+            pdfViewer.Load("../../Data/F#.pdf");
+        }
+
+        private void Rectangle_Click(object sender, RoutedEventArgs e)
+        {
+            pdfViewer.AnnotationMode = Syncfusion.Windows.PdfViewer.PdfDocumentView.PdfViewerAnnotationMode.Rectangle;
+            pdfViewer.ShapeAnnotationChanged += PdfViewer_ShapeAnnotationChanged;
+        }
+
+        private void PdfViewer_ShapeAnnotationChanged(object sender, Syncfusion.Windows.PdfViewer.ShapeAnnotationChangedEventArgs e)
+        {
+            if (e.Action == Syncfusion.Windows.PdfViewer.AnnotationChangedAction.Add)
+            {
+                bounds = e.NewBounds;
+                PdfLoadedDocument loadedDocument = pdfViewer.LoadedDocument;
+                using (OCRProcessor processor = new OCRProcessor("../../Tesseract binaries"))
+                {
+                    //Language to process the OCR
+                    processor.Settings.Language = Languages.English;
+                    Bitmap image = GetBitmap(pdfViewer.ExportAsImage(pdfViewer.CurrentPageIndex - 1));
+                    using (Bitmap clonedImage = image.Clone(bounds, System.Drawing.Imaging.PixelFormat.Format32bppArgb))
+                    {
+                        string ocrText = processor.PerformOCR(clonedImage, @"../../Tessdata/");
+                    }
+                    image.Dispose();
+                }
+            }
+
+        }
+
+        Bitmap GetBitmap(BitmapSource source)
+        {
+            Bitmap bmp = new Bitmap(
+              source.PixelWidth,
+              source.PixelHeight,
+              System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
+            BitmapData data = bmp.LockBits(
+              new System.Drawing.Rectangle(System.Drawing.Point.Empty, bmp.Size),
+              ImageLockMode.WriteOnly,
+              System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
+            source.CopyPixels(
+              Int32Rect.Empty,
+              data.Scan0,
+              data.Height * data.Stride,
+              data.Stride);
+            bmp.UnlockBits(data);
+            return bmp;
+        }
+    }
+}

How-to/How-to-extract-Text-using-OCR/ExtractingSample/WinForms_TextExtractionByOCR/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+using WinForms_TextExtractionByOCR;
+
+namespace WindWinForms_TextExtractionByOCR_NETowsFormsApp1
+{
+    internal static class Program
+    {
+        /// <summary>
+        /// The main entry point for the application.
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+            Application.EnableVisualStyles();
+            Application.SetCompatibleTextRenderingDefault(false);
+            Application.Run(new Form1());
+        }
+    }
+}

How-to/How-to-extract-Text-using-OCR/ExtractingSample/WinForms_TextExtractionByOCR/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("WinForms_TextExtractionByOCR")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("WinForms_TextExtractionByOCR")]
+[assembly: AssemblyCopyright("Copyright ©  2025")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("1b09455e-6f67-4155-afe2-eb421bab1190")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]