Hello there please I am facing a problem with searching and replacing a whole word with iTextSharp in a PDF.In fact the algorithme compare chunk with my WholeWorld and the chunk contain only three or two words. So the algorithme didn't find my exact word.
Here is my code: Program.cs
using testProject;
string sourceFile = @"C:\oldFile.pdf";
string descFile = @"C:\test.pdf";
PDFEdit pdfObj = new PDFEdit();
pdfObj.ReplaceTextInPDF(sourceFile, descFile, "client", "hello");
PDFEdit.cs:
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.pdf.parser;
using System.Drawing;
namespace testProject
{
public class PDFEdit
{
/// <summary>
/// Find the text and replace in PDF
/// </summary>
/// <param name="sourceFile">The source PDF file where text to be searched</param>
/// <param name="descFile">The new destination PDF file which will be saved with replaced text</param>
/// <param name="textToBeSearched">The text to be searched in the PDF</param>
/// <param name="textToBeReplaced">The text to be replaced with</param>
public void ReplaceTextInPDF(string sourceFile, string descFile, string textToBeSearched, string textToBeReplaced)
{
ReplaceText(textToBeSearched, textToBeReplaced, descFile, sourceFile);
}
private void ReplaceText(string textToBeSearched, string textToAdd, string outputFilePath, string inputFilePath)
{
try
{
using (Stream inputPdfStream = new FileStream(inputFilePath, FileMode.Open, FileAccess.Read, FileShare.Read))
using (Stream outputPdfStream = new FileStream(outputFilePath, FileMode.Create, FileAccess.Write, FileShare.ReadWrite))
using (Stream outputPdfStream2 = new FileStream(outputFilePath, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite))
{
//Opens the unmodified PDF for reading
PdfReader reader = new PdfReader(inputPdfStream);
//Creates a stamper to put an image on the original pdf
PdfStamper stamper = new PdfStamper(reader, outputPdfStream); //{ FormFlattening = true, FreeTextFlattening = true };
for (var i = 1; i <= reader.NumberOfPages; i++)
{
var tt = new MyLocationTextExtractionStrategy(textToBeSearched);
var ex = new PdfReaderContentParser(reader).ProcessContent(i, tt, new Dictionary<string, IContentOperator>()).GetResultantText();
// var ex = PdfTextExtractor.GetTextFromPage(reader, i, tt); // ex will be holding the text, although we just need the rectangles [RectAndText class objects]
foreach (var p in tt.myPoints)
{
//Creates an image that is the size i need to hide the text i'm interested in removing
Bitmap transparentBitmap = new Bitmap((int)p.Rect.Width, (int)p.Rect.Height);
transparentBitmap.MakeTransparent();
iTextSharp.text.Image image = iTextSharp.text.Image.GetInstance(new Bitmap(130, 20), BaseColor.BLACK);
//Sets the position that the image needs to be placed (ie the location of the text to be removed)
image.SetAbsolutePosition(p.Rect.Left, (p.Rect.Top - 8));
//Adds the image to the output pdf
stamper.GetOverContent(i).AddImage(image, true); // i stands for the page no.
PdfContentByte cb = stamper.GetOverContent(i);
// select the font properties
BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
cb.SetColorFill(BaseColor.BLACK);
cb.SetFontAndSize(bf, 7);
// write the text in the pdf content
cb.BeginText();
// put the alignment and coordinates here
cb.ShowTextAligned(1, textToAdd, p.Rect.Left + 10, p.Rect.Top - 6, 0);
cb.EndText();
}
}
//Creates the first copy of the outputted pdf
stamper.Close();
}
}
catch (Exception ex)
{
}
}
}
}
MyLocationTextExtractionStrategy.cs :
using iTextSharp.text.pdf.parser;
namespace testProject
{
internal class MyLocationTextExtractionStrategy : LocationTextExtractionStrategy
{
//Hold each coordinate
public List<RectAndText> myPoints = new List<RectAndText>();
//The string that we're searching for
public String TextToSearchFor { get; set; }
//How to compare strings
public System.Globalization.CompareOptions CompareOptions { get; set; }
public MyLocationTextExtractionStrategy(String textToSearchFor, System.Globalization.CompareOptions compareOptions = System.Globalization.CompareOptions.None)
{
this.TextToSearchFor = textToSearchFor;
this.CompareOptions = compareOptions;
}
//Automatically called for each chunk of text in the PDF
public override void RenderText(TextRenderInfo renderInfo)
{
base.RenderText(renderInfo);
//See if the current chunk contains the text
//var startPosition = System.Globalization.CultureInfo.CurrentCulture.CompareInfo.IndexOf(renderInfo.GetText(), this.TextToSearchFor, this.CompareOptions);
Console.WriteLine(renderInfo.GetText());
var startPosition = -1;
if (this.TextToSearchFor.Contains(renderInfo.GetText()))
{
startPosition = 0;
}
Console.WriteLine(startPosition);
//If not found bail
if (startPosition < 0)
{
return;
}
//Grab the individual characters
var chars = renderInfo.GetCharacterRenderInfos().Skip(startPosition).Take(this.TextToSearchFor.Length).ToList();
//Grab the first and last character
var firstChar = chars.First();
var lastChar = chars.Last();
//Get the bounding box for the chunk of text
var bottomLeft = firstChar.GetDescentLine().GetStartPoint();
var topRight = lastChar.GetAscentLine().GetEndPoint();
//Create a rectangle from it
var rect = new iTextSharp.text.Rectangle(bottomLeft[Vector.I1], bottomLeft[Vector.I2], topRight[Vector.I1], topRight[Vector.I2]);
//Add this to our main collection
this.myPoints.Add(new RectAndText(rect, this.TextToSearchFor));
}
}
}
RectAndText.cs:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace testProject
{
internal class RectAndText
{
public iTextSharp.text.Rectangle Rect;
public String Text;
public RectAndText(iTextSharp.text.Rectangle rect, String text)
{
this.Rect = rect;
this.Text = text;
}
}
}