- //
- // This code is part of Document Solutions for PDF demos.
- // Copyright (c) MESCIUS inc. All rights reserved.
- //
- using System.IO;
- using System.Drawing;
- using System.Text.RegularExpressions;
- using GrapeCity.Documents.Pdf;
- using GrapeCity.Documents.Pdf.Annotations;
- using GrapeCity.Documents.Pdf.TextMap;
- using GrapeCity.Documents.Pdf.AcroForms;
- namespace DsPdfWeb.Demos
- {
- // This sample shows how to use the text map to find specific content
- // in a PDF and mark it for redaction.
- // Check out the ApplyRedact sample to see how the redact annotations
- // added by this sample can be applied to actually erase the data.
- // Also check out the samples in DsPdfViewer section to see how
- // redact annotations (added programmatically as in this sample,
- // or via the viewer's UI) can be applied selectively or all together.
- // The PDF used in this sample was created by TimeSheet.
- public class FindAndRedact
- {
- public int CreatePDF(Stream stream)
- {
- var doc = new GcPdfDocument();
- using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "TimeSheet.pdf"));
- doc.Load(fs);
- // Note: Acrobat does not allow applying redactions in a digitally signed
- // document, so first we find and remove any existing signatures:
- removeSignatureFields(doc.AcroForm.Fields);
- // Loop through pages, removing anything that looks like a short date:
- foreach (var page in doc.Pages)
- {
- var tmap = page.GetTextMap();
- foreach (ITextLine tline in tmap)
- {
- if (Regex.Match(tline.Text.Trim(), @"\d+[/-]\w+[/-]\d").Success)
- {
- var redact = new RedactAnnotation()
- {
- Rect = tline.GetCoords().ToRect(),
- MarkBorderColor = Color.Red,
- MarkFillColor = Color.Yellow,
- Page = page
- };
- // If we hadn't already set redact.Page = page, we could do this:
- // page.Annotations.Add(redact);
- }
- }
- }
- // Done:
- doc.Save(stream);
- return doc.Pages.Count;
- // This code is from the RemoveSignatureFields sample:
- static void removeSignatureFields(FieldCollection fields)
- {
- for (int i = fields.Count - 1; i >= 0; --i)
- {
- removeSignatureFields(fields[i].Children);
- if (fields[i] is SignatureField)
- fields.RemoveAt(i);
- }
- }
- }
- // Viewer options for SupportApiDemo:
- public static GcPdfViewerSupportApiDemo.Models.PdfViewerOptions PdfViewerOptions
- {
- get => new GcPdfViewerSupportApiDemo.Models.PdfViewerOptions(
- GcPdfViewerSupportApiDemo.Models.PdfViewerOptions.Options.AnnotationEditorPanel |
- GcPdfViewerSupportApiDemo.Models.PdfViewerOptions.Options.ActivateAnnotationEditor,
- viewerTools: new string[] { "save", "edit-redact-apply", "$split", "text-selection", "pan", "$zoom", "$fullscreen", "print", "rotate", "download", "doc-properties", "about" },
- annotationEditorTools: new string[] { "save", "edit-redact", "edit-redact-apply" });
- }
- }
- }