iTextSharp — few C# examples.

Referred URL - http://simpledotnetsolutions.wordpress.com/2012/04/08/itextsharp-few-c-examples/

iTextSharp is open source PDF solution. In most of the examples below, I tried to alter,copy a template PDF and then save it into a brand new output PDF file. It’s easy to work with PDFs , when we have a basic template (created externally using Adobe/OpenOffice) in place, –  instead of generating a new PDF from scratch. For any data which needs to be modified, I do it in the web page and then save the modified data/results to a pdf file. This prevents the need, for user to modify the pdf form fields.

http://www.itextpdf.com/book/chapter.php?id=1

This web link was the basic source, for all my scenarios. (Note: The examples in iTextSharp site are in java)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using System.IO;
using iTextSharp.text.pdf;
using System.Data;
using System.Text;
using iTextSharp.text.pdf.parser;
using System.util.collections;
using iTextSharp.text;
using System.Net.Mail;

public partial class PDFScenarios : System.Web.UI.Page
{
public string P_InputStream = "~/MyPDFTemplates/ex1.pdf";
public string P_InputStream2 = "~/MyPDFTemplates/ContactInfo.pdf";
public string P_InputStream3 = "~/MyPDFTemplates/MulPages.pdf";
public string P_InputStream4 = "~/MyPDFTemplates/CompanyLetterHead.pdf";
public string P_OutputStream = "~/MyPDFOutputs/ex1_1.pdf";

//Read all 'Form values/keys' from an existing multi-page PDF document
public void ReadPDFformDataPageWise()
{
PdfReader reader = new PdfReader(Server.MapPath(P_InputStream3));
AcroFields form = reader.AcroFields;
try
{
for (int page = 1; page <= reader.NumberOfPages; page++)
{
    foreach (KeyValuePair<string, AcroFields.Item> kvp in form.Fields)
    {
        switch (form.GetFieldType(kvp.Key))
        {
            case AcroFields.FIELD_TYPE_CHECKBOX:
            case AcroFields.FIELD_TYPE_COMBO:
            case AcroFields.FIELD_TYPE_LIST:
            case AcroFields.FIELD_TYPE_RADIOBUTTON:
            case AcroFields.FIELD_TYPE_NONE:
            case AcroFields.FIELD_TYPE_PUSHBUTTON:
            case AcroFields.FIELD_TYPE_SIGNATURE:
            case AcroFields.FIELD_TYPE_TEXT:
                int fileType = form.GetFieldType(kvp.Key);
                string fieldValue = form.GetField(kvp.Key);
                string translatedFileName = form.GetTranslatedFieldName(kvp.Key);
                break;
        }
    }
}
}
catch
{
}
finally
{
    reader.Close();
}
}

//Read and alter form values for only second and 
//third page of an existing multi page PDF doc.
//Save the changes in a brand new pdf file.
public void ReadAlterPDFformDataInSelectedPages()
{
PdfReader reader = new PdfReader(Server.MapPath(P_InputStream3));
reader.SelectPages("1-2"); //Work with only page# 1 & 2
using (PdfStamper stamper = new PdfStamper(reader, new FileStream(Server.MapPath(P_OutputStream), FileMode.Create)))
{
    AcroFields form = stamper.AcroFields;
    var fieldKeys = form.Fields.Keys;
    foreach (string fieldKey in fieldKeys)
    {
        //Replace Address Form field with my custom data
        if (fieldKey.Contains("Address"))
        {
            form.SetField(fieldKey, "MyCustomAddress");
        }
    }
    //The below will make sure the fields are not editable in
    //the output PDF.
    stamper.FormFlattening = true;
}
}

//Extract text from an existing PDF's second page.
private string ExtractText()
{
    PdfReader reader = new PdfReader(Server.MapPath(P_InputStream3));
    string txt =  PdfTextExtractor.GetTextFromPage(reader, 2, new LocationTextExtractionStrategy());
    return txt;
}

//Create a brand new PDF from scratch and without a template
private void CreatePDFNoTemplate()
{
    Document pdfDoc = new Document();
    PdfWriter writer = PdfWriter.GetInstance(pdfDoc, new FileStream(Server.MapPath(P_OutputStream), FileMode.OpenOrCreate));

    pdfDoc.Open();
    pdfDoc.Add(new Paragraph("Some data"));
    PdfContentByte cb = writer.DirectContent;
    cb.MoveTo(pdfDoc.PageSize.Width / 2, pdfDoc.PageSize.Height / 2);
    cb.LineTo(pdfDoc.PageSize.Width / 2, pdfDoc.PageSize.Height);
    cb.Stroke();

    pdfDoc.Close(); 
}

private void fillPDFForm()
{
    string formFile = Server.MapPath(P_InputStream);
    string newFile = Server.MapPath(P_OutputStream);
    PdfReader reader = new PdfReader(formFile);
    using (PdfStamper stamper = new PdfStamper(reader, new FileStream(newFile, FileMode.Create)))
    {
        AcroFields fields = stamper.AcroFields;

        // set form fields
        fields.SetField("name", "John Doe");
        fields.SetField("address", "xxxxx, yyyy");
        fields.SetField("postal_code", "12345");
        fields.SetField("email", "johndoe@xxx.com");

        // flatten form fields and close document
        stamper.FormFlattening = true;
        stamper.Close();
    }
}

//Helper functions
private void SendEmail(MemoryStream ms)
{
    MailAddress _From = new MailAddress("XXX@domain.com");
    MailAddress _To = new MailAddress("YYY@a.com"); 
    MailMessage email = new MailMessage(_From, _To); 
    Attachment attach = new Attachment(ms,  new System.Net.Mime.ContentType("application/pdf")); 
    email.Attachments.Add(attach);  
    SmtpClient mailSender = new SmtpClient("Gmail-Server"); 
    mailSender.Send(email);  
}

private void DownloadAsPDF(MemoryStream ms)
{
    Response.Clear();
    Response.ClearContent();
    Response.ClearHeaders();
    Response.ContentType = "application/pdf";
    Response.AppendHeader("Content-Disposition", "attachment;filename=abc.pdf");
    Response.OutputStream.Write(ms.GetBuffer(), 0, ms.GetBuffer().Length);
    Response.OutputStream.Flush();
    Response.OutputStream.Close();
    Response.End();
    ms.Close();
}

//Working with Memory Stream and PDF
public void CreatePDFFromMemoryStream()
{
    //(1)using PDFWriter
    Document doc = new Document();
    MemoryStream memoryStream = new MemoryStream();
    PdfWriter writer = PdfWriter.GetInstance(doc, memoryStream);
    doc.Open();
    doc.Add(new Paragraph("Some Text"));
    writer.CloseStream = false;
    doc.Close();
    //Get the pointer to the beginning of the stream. 
    memoryStream.Position = 0;
    //You may use this PDF in memorystream to send as an attachment in an email
    //OR download as a PDF
    SendEmail(memoryStream);
    DownloadAsPDF(memoryStream);

    //(2)Another way using PdfStamper
    PdfReader reader = new PdfReader(Server.MapPath(P_InputStream2));
    using (MemoryStream ms = new MemoryStream())
    {
        PdfStamper stamper = new PdfStamper(reader, ms);
        AcroFields fields = stamper.AcroFields;
        fields.SetField("SomeField", "MyValueFromDB");
        stamper.FormFlattening = true;
        stamper.Close();
        SendEmail(ms);
    }
}

//Burst-- Make each page of an existing multi-page PDF document 
//as another brand new PDF document
private void PDFBurst()
{
    string pdfTemplatePath = Server.MapPath(P_InputStream3);
    PdfReader reader = new PdfReader(pdfTemplatePath);
    //PdfCopy copy;
    PdfSmartCopy copy;
    for (int i = 1; i < reader.NumberOfPages; i++)
    {
        Document d1 = new Document();
        copy = new PdfSmartCopy(d1, new FileStream(Server.MapPath(P_OutputStream).Replace(".pdf", i.ToString() + ".pdf"), FileMode.Create));
        d1.Open();
        copy.AddPage(copy.GetImportedPage(reader, i));
        d1.Close();
    }
}

//Copy a set of form fields from an existing PDF template/doc
//and keep appending to a brand new PDF file.
//The copied set of fields will have different values.
private void AppendSetOfFormFields()
{
    PdfCopyFields _copy = new PdfCopyFields(new FileStream(Server.MapPath(P_OutputStream), FileMode.Create));
    _copy.AddDocument(new PdfReader(a1("1")));
    _copy.AddDocument(new PdfReader(a1("2")));
    _copy.AddDocument(new PdfReader(new FileStream(Server.MapPath("~/MyPDFTemplates/Myaspx.pdf"), FileMode.Open)));
    _copy.Close();
}
//ConcatenateForms
private byte[] a1(string _ToAppend)
{
    using (var existingFileStream = new FileStream(Server.MapPath(P_InputStream), FileMode.Open))
    using (MemoryStream stream = new MemoryStream())
    {
        // Open existing PDF
        var pdfReader = new PdfReader(existingFileStream);
        var stamper = new PdfStamper(pdfReader, stream);
        var form = stamper.AcroFields;
        var fieldKeys = form.Fields.Keys;

        foreach (string fieldKey in fieldKeys)
        {
            form.RenameField(fieldKey, fieldKey + _ToAppend);
        }
        // "Flatten" the form so it wont be editable/usable anymore
        stamper.FormFlattening = true;
        stamper.Close();
        pdfReader.Close();
        return stream.ToArray();
    }
}

//Working with Image
private void AddAnImage()
{
    using (var inputPdfStream = new FileStream(@"C:\MyInput.pdf", FileMode.Open))
    using (var inputImageStream = new FileStream(@"C:\img1.jpg", FileMode.Open))
    using (var outputPdfStream = new FileStream(@"C:\MyOutput.pdf", FileMode.Create))
    {
        PdfReader reader = new PdfReader(inputPdfStream);
        PdfStamper stamper = new PdfStamper(reader, outputPdfStream);
        PdfContentByte pdfContentByte = stamper.GetOverContent(1);
        var image = iTextSharp.text.Image.GetInstance(inputImageStream);
        image.SetAbsolutePosition(1, 1);
        pdfContentByte.AddImage(image);
        stamper.Close();
    }

}

//Add Company Letter-Head/Stationary to an existing pdf
private void AddCompanyStationary()
{
    PdfReader reader = new PdfReader(Server.MapPath(P_InputStream2));
    PdfReader s_reader = new PdfReader(Server.MapPath(P_InputStream4));

    using (PdfStamper stamper = new PdfStamper(reader, new FileStream(Server.MapPath(P_OutputStream), FileMode.Create)))
    {
        PdfImportedPage page = stamper.GetImportedPage(s_reader, 1);
        int n = reader.NumberOfPages;
        PdfContentByte background;
        for (int i = 1; i <= n; i++)
        {
            background = stamper.GetUnderContent(i);
            background.AddTemplate(page, 0, 0);
        }
        stamper.Close();
    }
}

//Create a new PDF document by copying only 2nd page from an existing PDF document.
//Also add a date on the top-left corner.
private void AddText()
{
    //Method 1:
    PdfReader reader = new PdfReader(Server.MapPath(P_InputStream3));
    using (Document document = new Document())
    {
        using (PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(Server.MapPath(P_OutputStream), FileMode.Create)))
        {
            document.Open();
            PdfContentByte cb = writer.DirectContent;
            PdfImportedPage page = writer.GetImportedPage(reader, 2);

            document.NewPage();
            cb.AddTemplate(page, 0, 0);
            document.Add(new Paragraph(DateTime.Now.ToShortDateString()));
            document.Close();
        }
    }

    //Method 2:
    PdfReader reader2 = new PdfReader(Server.MapPath(P_InputStream3));
    using (PdfStamper stamper = new PdfStamper(reader, new FileStream(Server.MapPath(P_OutputStream), FileMode.Create)))
    {
        stamper.RotateContents = false;
        PdfContentByte canvas = stamper.GetOverContent(2);
        ColumnText.ShowTextAligned(canvas, Element.ALIGN_LEFT, new Phrase(DateTime.Now.ToShortDateString()), 0, 0, 0);
        stamper.Close();
    }
}

//DataSheets: Copy 2 pages from one PDF to another brand new PDF.
//Also alter some form data
private void CreatePDFByCopy()
{
    using (Document document = new Document())
    {
        using (PdfSmartCopy copy = new PdfSmartCopy(document, new FileStream(Server.MapPath(P_OutputStream), FileMode.Create)))
        {
            document.Open();
            for (int i = 0; i < 2; ++i)
            {
                PdfReader reader = new PdfReader(AddDataSheets("Some Text" + i.ToString()));
                copy.AddPage(copy.GetImportedPage(reader, 1));
            }
        }
    }
}

public byte[] AddDataSheets(string _data)
{
    string pdfTemplatePath = Server.MapPath(P_InputStream2);
    PdfReader reader = new PdfReader(pdfTemplatePath);
    using (MemoryStream ms = new MemoryStream())
    {
        using (PdfStamper stamper = new PdfStamper(reader, ms))
        {
            AcroFields form = stamper.AcroFields;
            var fieldKeys = form.Fields.Keys;
            foreach (string fieldKey in fieldKeys)
            {
                //Change some data
                if (fieldKey.Contains("Address"))
                {
                    form.SetField(fieldKey, _data);
                }
            }        
            stamper.FormFlattening = true;
        }
        return ms.ToArray();
    }
}