public static void Main(string[] args)
{
string supportPath = "..\\..\\..\\..\\..\\SupportFiles\\";
FileStream input = File.OpenRead(supportPath + "content.pdf");
PDFFixedDocument document = new PDFFixedDocument(input);
input.Close();
PDFContentExtractor ce = new PDFContentExtractor(document.Pages[0]);
PDFTextSearchResultCollection searchResults = ce.SearchText("lorem");
if (searchResults.Count > 0)
{
PDFContentRedactor cr = new PDFContentRedactor(document.Pages[0]);
cr.BeginRedaction();
for (int i = 0; i < searchResults.Count; i++)
{
cr.RedactArea(searchResults[i].VisualBounds);
}
cr.ApplyRedaction();
}
using (FileStream output = File.Create("RedactedSearchResults.pdf"))
{
document.Save(output);
}
}
private static void HighlightSearchResults(PDFPage page, PDFTextSearchResultCollection searchResults, PDFColor color)
{
PDFPen pen = new PDFPen(color, 0.5);
for (int i = 0; i < searchResults.Count; i++)
{
PDFTextFragmentCollection tfc = searchResults[i].TextFragments;
for (int j = 0; j < tfc.Count; j++)
{
PDFPath path = new PDFPath();
path.StartSubpath(tfc[j].FragmentCorners[0].X, tfc[j].FragmentCorners[0].Y);
path.AddPolygon(tfc[j].FragmentCorners);
page.Canvas.DrawPath(pen, path);
}
}
}
/// <summary>
/// Main method for running the sample.
/// </summary>
public static SampleOutputInfo[] Run(Stream input)
{
PDFFixedDocument document = new PDFFixedDocument(input);
PDFContentExtractor ce = new PDFContentExtractor(document.Pages[0]);
// Simple search.
PDFTextSearchResultCollection searchResults = ce.SearchText("at");
HighlightSearchResults(document.Pages[0], searchResults, PDFRgbColor.Red);
// Whole words search.
searchResults = ce.SearchText("at", PDFTextSearchOptions.WholeWordSearch);
HighlightSearchResults(document.Pages[0], searchResults, PDFRgbColor.Green);
// Regular expression search, find all words that start with uppercase.
searchResults = ce.SearchText("[A-Z][a-z]*", PDFTextSearchOptions.RegExSearch);
HighlightSearchResults(document.Pages[0], searchResults, PDFRgbColor.Blue);
SampleOutputInfo[] output = new SampleOutputInfo[] { new SampleOutputInfo(document, "searchtext.pdf") };
return(output);
}
