chap0112.cs

iTextSharp

using System;
using System.IO;

using iTextSharp.text;
using iTextSharp.text.pdf;


namespace iTextSharp.tutorial.Chap01
{
	/// <summary>
	/// Chap0112 的摘要说明。
	/// </summary>
	public class Chap0112
	{
		public Chap0112()
		{
			Console.WriteLine("Chapter 1 example 12: reading an existing PDF file");
        
			try 
			{
				// we create a reader for a certain document
				PdfReader reader = new PdfReader("Chap0703.pdf");
				// we retrieve the total number of pages
				int n = reader.NumberOfPages;
				// we retrieve the size of the first page
				Rectangle psize = reader.GetPageSize(1);
				float width = psize.Width;
				float height = psize.Height;
            
				// step 1: creation of a document-object
				Document document = new Document(psize, 50, 50, 50, 50);
				// step 2: we create a writer that listens to the document
				PdfWriter writer = PdfWriter.GetInstance(document, new FileStream("Chap0112.pdf", FileMode.Create));
				// step 3: we open the document
				try 
				{
					Watermark watermark = new Watermark(Image.GetInstance("watermark.jpg"), 200, 320);
					document.Add(watermark);
				}
				catch(Exception e) 
				{
					Console.Error.WriteLine("Are you sure you have the file 'watermark.jpg' in the right path?");
				}
				document.Open();
				// step 4: we add content
				PdfContentByte cb = writer.DirectContent;
				int i = 0;
				int p = 0;
				Console.WriteLine("There are " + n + " pages in the document.");
				while (i < n) 
				{
					document.NewPage();
					p++;
					i++;
					PdfImportedPage page1 = writer.GetImportedPage(reader, i);
					cb.AddTemplate(page1, .5f, 0, 0, .5f, 0, height / 2);
					Console.WriteLine("processed page " + i);
					if (i < n) 
					{
						i++;
						PdfImportedPage page2 = writer.GetImportedPage(reader, i);
						cb.AddTemplate(page2, .5f, 0, 0, .5f, width / 2, height / 2);
						Console.WriteLine("processed page " + i);
					}
					if (i < n) 
					{
						i++;
						PdfImportedPage page3 = writer.GetImportedPage(reader, i);
						cb.AddTemplate(page3, .5f, 0, 0, .5f, 0, 0);
						Console.WriteLine("processed page " + i);
					}
					if (i < n) 
					{
						i++;
						PdfImportedPage page4 = writer.GetImportedPage(reader, i);
						cb.AddTemplate(page4, .5f, 0, 0, .5f, width / 2, 0);
						Console.WriteLine("processed page " + i);
					}
					cb.SetRGBColorStroke(255, 0, 0);
					cb.MoveTo(0, height / 2);
					cb.LineTo(width, height / 2);
					cb.Stroke();
					cb.MoveTo(width / 2, height);
					cb.LineTo(width / 2, 0);
					cb.Stroke();
					BaseFont bf = BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
					cb.BeginText();
					cb.SetFontAndSize(bf, 14);
					cb.ShowTextAligned(PdfContentByte.ALIGN_CENTER, "page " + p + " of " + ((n / 4) + (n % 4 > 0? 1 : 0)), width / 2, 40, 0);
					cb.EndText();
				}
				// step 5: we close the document
				document.Close();
			}
			catch (Exception de) 
			{
				Console.Error.WriteLine(de.Message);
				Console.Error.WriteLine(de.StackTrace);
			}

		}
	}
}