Hi All,
I've created an output PDF file using PdfWriter. The output PDF comes out no
problem. However, when I try to read the newly created PDF using
ExtractTextPDFBytes it returns an empty string.
Does anybody know why it happens?
The function ExtractTextString will read any PDF, but not the one produced
by ITextSharp.
Below is the code I wrote. Please help me figure out where's the problem.
Txs. Eric
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using iTextSharp;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.xml;
using System.IO;
namespace PDFStamping
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
//Sample form with the button btnStamp
private void btnStamp_Click(object sender, EventArgs e)
{
string inputFilePath = "C:\\Temp\\Test_PDF.pdf";
string outputFilePath = "C:\\Temp\\Test_PDF_output.pdf";
stampPDF(inputFilePath, outputFilePath);
}
//Main routine which creates an output PDF and show its content
private void stampPDF(string inputFile, string outputFile)
{
PdfImportedPage page = null;
Int32 pageCount = 0; //The total of pages PDF
Int32 pageNumber = 0; //The indicator of the current page
//Read PDF
PdfReader reader = new PdfReader(inputFile);
Int32 intNoOfPages = reader.NumberOfPages;
//Set Stamper
Document pdfDoc = new
Document(reader.GetPageSizeWithRotation(1));
PdfWriter writer = PdfWriter.GetInstance(pdfDoc, new
FileStream(outputFile, FileMode.Create));
writer.SetPdfVersion(PdfWriter.PDF_VERSION_1_2);
//Start Stamp
pdfDoc.Open();
PdfContentByte cb = writer.DirectContent;
pageCount = reader.NumberOfPages;
pageNumber = 1;
for (int i = 0; i < pageCount; i++)
{
pdfDoc.SetPageSize(reader.GetPageSizeWithRotation(pageNumber));
pdfDoc.NewPage();
page = writer.GetImportedPage(reader, pageNumber);
cb.AddTemplate(page, 1.04F, 0, 0, 1.04F, 0, 0);
pageNumber++;
}
string strRet = ExtractTextString(outputFile, 1);
MessageBox.Show("Start PDF content" + "\n" + strRet + "\n" +
"End PDF content");
pdfDoc.Close();
}
#region ExtractTextString
/// <summary>
/// Extracts the text from a PDF file.
/// </summary>
/// the full path to the pdf file.
/// <returns>the extracted text</returns>
public string ExtractTextString(string inFileName, Int32 intPage)
{
string outFile = null;
try
{
// Create a reader for the given PDF file
PdfReader reader = new PdfReader(inFileName);
outFile +=
(ExtractTextPDFBytes(reader.GetPageContent(intPage)) + " ");
return outFile;
}
catch
{
return "";
}
}
#endregion
#region ExtractTextPDFBytes
/// <summary>
/// This method processes an uncompressed Adobe (text) object
/// and extracts text.
/// </summary>
/// uncompressed
/// <returns></returns>
private string ExtractTextPDFBytes(byte[] input)
{
bool blnStartBracket = false;
bool blnStartWrite = false;
if (input == null || input.Length == 0) return "";
try
{
string resultString = "";
for (int i = 0; i < input.Length; i++)
{
char c = (char)input[i];
if (((c >= ' ') && (c <= '~')) || ((c >= 128) && (c <
255)))
{
if (blnStartBracket == true)
blnStartWrite = true;
if (c.ToString() == "(")
{
blnStartBracket = true;
}
else if (c.ToString() == ")")
{
blnStartBracket = false;
blnStartWrite = false;
}
if (blnStartWrite == true)
{
resultString += c.ToString();
}
}
}
return resultString;
}
catch
{
return "";
}
}
#endregion
}
}
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