// 完毕:
using System;
using System.IO;
using System.Drawing;
using GrapeCity.Documents.Pdf;
using GrapeCity.Documents.Text;
using GrapeCity.Documents.Pdf.Annotations;
using System.Collections.Generic;
using GrapeCity.Documents.Common;
namespace DsPdfWeb.Demos
{
// This example shows how to find all occurrences of two words in a PDF document and
// underline those occurrences using the text markup underline annotation.
public class FindAndUnderline
{
public int CreatePDF(Stream stream)
{
// Load the PDF:
var doc = new GcPdfDocument();
using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "The-Rich-History-of-JavaScript.pdf"));
doc.Load(fs);
// Find all occurrences of "JavaScript" or "ECMAScript" using regex:
var ft = new FindTextParams("JavaScript|ECMAScript", wholeWord: false, matchCase: false, regex: true);
var found = doc.FindText(ft, null);
// Add a text markup annotation to underline each occurrence:
foreach (var f in found)
{
var markup = new TextMarkupAnnotation()
{
Page = doc.Pages[f.PageIndex],
MarkupType = TextMarkupType.Underline,
Color = Color.Red
};
List<Quadrilateral> area = new List<Quadrilateral>();
foreach (var b in f.Bounds)
area.Add(b);
markup.Area = area;
}
// Done:
doc.Save(stream);
return doc.Pages.Count;
}
}
}