kmpdfkit_demo/Demo/Examples/Samples/TextSearchTest/TextSearch.cs

using ComPDFKit.Import;
using ComPDFKit.PDFAnnotation;
using ComPDFKit.PDFDocument;
using ComPDFKit.PDFPage;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace TextSearchTest
{
    internal class TextSearch
    {
        static private string outputPath = Path.GetDirectoryName(Path.GetDirectoryName(Path.GetDirectoryName(System.IO.Directory.GetCurrentDirectory()))) + "\\Output\\TextSearch";
        static void Main(string[] args)
        {
            Console.WriteLine("Running text search test sample…\r\n");
                        if (!Directory.Exists(outputPath))
            {
                Directory.CreateDirectory(outputPath);
            }
            SDKLicenseHelper.LicenseVerify();
            CPDFDocument document = CPDFDocument.InitWithFilePath("Text.pdf");

            SearchText(document);

            Console.WriteLine("--------------------");
            Console.WriteLine("Done");
            Console.WriteLine("--------------------");

            Console.ReadLine();
        }

        static void SearchForPage(CPDFPage page, string searchKeywords, C_Search_Options option, ref List<Rect> rects, ref List<string> strings)
        {
            rects = new List<Rect>();
            strings = new List<string>();
            int findIndex = 0;

            CPDFTextPage textPage = page.GetTextPage();
            CPDFTextSearcher searcher = new CPDFTextSearcher();

            if (searcher.FindStart(textPage, searchKeywords, option, 0))
            {
                CRect textRect = new CRect();
                string textContent = "";
                while (searcher.FindNext(page, textPage, ref textRect, ref textContent, ref findIndex))
                {
                    strings.Add(textContent);
                    rects.Add(new Rect(textRect.left, textRect.top, textRect.width(), textRect.height()));
                }
            }
        }

        static private bool HighlightTheFirstResult(CPDFPage page, Rect rect)
        {
            List<CRect> cRectList = new List<CRect>();
            cRectList.Add(new CRect((float)rect.Left, (float)rect.Top, (float)rect.Right, (float)rect.Bottom));

            CPDFHighlightAnnotation annotation = page.CreateAnnot(C_ANNOTATION_TYPE.C_ANNOTATION_HIGHLIGHT) as CPDFHighlightAnnotation;
            byte[] color = { 0, 255, 0 };
            annotation.SetColor(color);
            annotation.SetTransparency(120);
            annotation.SetQuardRects(cRectList);
            annotation.UpdateAp();
            return true;
        }

        static private bool SearchText(CPDFDocument document)
        {
            CPDFPage page = document.PageAtIndex(0);
            List<Rect> rects = new List<Rect>();
            List<string> strings = new List<string>();
            SearchForPage(page, "PDF", C_Search_Options.Search_Case_Insensitive, ref rects, ref strings);
            Console.WriteLine("the key PDF have {0} results", rects.Count);

            Console.WriteLine("Search finished, now highlight the first result. ");
            HighlightTheFirstResult(page, rects[0]);
            string path = outputPath + "\\HighlightFirstTest.pdf";
            if (!document.WriteToFilePath(path))
            {
                return false;
            }
            Console.WriteLine("Browse the changed file in " + path);
            return true;
        }

    }
}