‫نحوه ذخیره شدن متن در فایل‌های PDF

using System.Diagnostics;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;

namespace TestReaders
{
    class Program
    {
        static void writePdf()
        {
            using (var document = new Document(PageSize.A4))
            {
                var writer = PdfWriter.GetInstance(document, new FileStream("test.pdf", FileMode.Create));
                document.Open();

                document.Add(new Paragraph("Test"));

                PdfContentByte cb = writer.DirectContent;
                BaseFont bf = BaseFont.CreateFont();
                cb.BeginText();
                cb.SetFontAndSize(bf, 12);
                cb.MoveText(88.66f, 367);
                cb.ShowText("ld");
                cb.MoveText(-22f, 0);
                cb.ShowText("Wor");
                cb.MoveText(-15.33f, 0);
                cb.ShowText("llo");
                cb.MoveText(-15.33f, 0);
                cb.ShowText("He"); 
                cb.EndText();

                PdfTemplate tmp = cb.CreateTemplate(250, 25);
                tmp.BeginText();
                tmp.SetFontAndSize(bf, 12);
                tmp.MoveText(0, 7);
                tmp.ShowText("Hello People");
                tmp.EndText();
                cb.AddTemplate(tmp, 36, 343);
            }

            Process.Start("test.pdf");
        }

        private static void readPdf()
        {
            var reader = new PdfReader("test.pdf");
            int intPageNum = reader.NumberOfPages;
            for (int i = 1; i <= intPageNum; i++)
            {
                byte[] contentBytes = reader.GetPageContent(i);
                File.WriteAllBytes("page-" + i + ".txt", contentBytes);
            }
            reader.Close();
        }

        static void Main(string[] args)
        {
            writePdf();
            readPdf();
        }
    }
}

q
BT
36 806 Td
0 -18 Td
/F1 12 Tf
(Test)Tj
0 0 Td
ET
Q
BT
/F1 12 Tf
88.66 367 Td
(ld)Tj
-22 0 Td
(Wor)Tj
-15.33 0 Td
(llo)Tj
-15.33 0 Td
(He)Tj
ET
q 1 0 0 1 36 343 cm /Xf1 Do Q

SaveGraphicsState(); // q
BeginText(); // BT
MoveTextPos(36, 806); // Td
MoveTextPos(0, -18); // Td
SelectFontAndSize("/F1", 12); // Tf
ShowText("(Test)"); // Tj
MoveTextPos(0, 0); // Td
EndTextObject(); // ET
RestoreGraphicsState(); // Q
BeginText(); // BT
SelectFontAndSize("/F1", 12); // Tf
MoveTextPos(88.66, 367); // Td
ShowText("(ld)"); // Tj
MoveTextPos(-22, 0); // Td
ShowText("(Wor)"); // Tj
MoveTextPos(-15.33, 0); // Td
ShowText("(llo)"); // Tj
MoveTextPos(-15.33, 0); // Td
ShowText("(He)"); // Tj
EndTextObject(); // ET
SaveGraphicsState(); // q
TransMatrix(1, 0, 0, 1, 36, 343); // cm
XObject("/Xf1"); // Do
RestoreGraphicsState(); // Q