'' '' This code is part of Document Solutions for PDF demos. '' Copyright (c) MESCIUS inc. All rights reserved. '' Imports System.IO Imports System.Drawing Imports System.Text.RegularExpressions Imports GrapeCity.Documents.Pdf Imports GrapeCity.Documents.Pdf.Annotations Imports GrapeCity.Documents.Pdf.AcroForms '' This sample shows how to use the text map to find specific content '' in a PDF And mark it for redaction. '' The PDF used in this sample was created by TimeSheet. Public Class FindAndRedact Public Function CreatePDF(ByVal stream As Stream) As Integer Dim doc = New GcPdfDocument() Using fs As New FileStream(Path.Combine("Resources", "PDFs", "TimeSheet.pdf"), FileMode.Open, FileAccess.Read) 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 For Each page In doc.Pages Dim tmap = page.GetTextMap() For Each tline In tmap If (Regex.Match(tline.Text.Trim(), "\d+[/-]\w+[/-]\d").Success) Then Dim redact = New RedactAnnotation() With { .Rect = tline.GetCoords().ToRect(), .Color = Color.Red, .Page = page, .MarkBorderColor = Color.Red, .MarkFillColor = Color.Yellow } '' If we hadn't already set redact.Page = page, we could do this: '' page.Annotations.Add(redact) End If Next Next '' Done doc.Save(stream) Return doc.Pages.Count End Using End Function '' This code Is from the RemoveSignatureFields sample: Sub RemoveSignatureFields(ByVal fields As FieldCollection) For i = fields.Count - 1 To 0 Step -1 RemoveSignatureFields(fields(i).Children) If TypeOf fields(i) Is SignatureField Then fields.RemoveAt(i) End If Next End Sub End Class