using System;

using System.IO;

using System.Text;

using System.Collections;

namespace PDFGenerator

{

    public class PDFGenerator

    {

        static float pageWidth = 594.0f;

        static float pageDepth = 828.0f;

        static float pageMargin = 30.0f;

        static float fontSize = 20.0f;

        static float leadSize = 10.0f;

        static StreamWriter pPDF = new StreamWriter("E:\\myPDF.pdf");

        static MemoryStream mPDF = new MemoryStream();

        static void ConvertToByteAndAddtoStream(string strMsg)

        {

            Byte[] buffer = null;

            buffer = ASCIIEncoding.ASCII.GetBytes(strMsg);

            mPDF.Write(buffer, 0, buffer.Length);

            buffer = null;

        }

        static string xRefFormatting(long xValue)

        {

            string strMsg = xValue.ToString();

            int iLen = strMsg.Length;

            if (iLen < 10)

            {

                StringBuilder s = new StringBuilder();

                int i = 10 - iLen;

                s.Append('0', i);

                strMsg = s.ToString() + strMsg;

            }

            return strMsg;

        }

        static void Main(string[] args)

        {

            ArrayList xRefs = new ArrayList();

            //Byte[] buffer=null;

            float yPos = 0f;

            long streamStart = 0;

            long streamEnd = 0;

            long streamLen = 0;

            string strPDFMessage = null;

            //PDF文档头信息

            strPDFMessage = "%PDF-1.1\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            xRefs.Add(mPDF.Length);

            strPDFMessage = "1 0 obj\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            strPDFMessage = "<< /Length 2 0 R >>\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            strPDFMessage = "stream\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            ////////PDF文档描述

            streamStart = mPDF.Length;

            //字体

            strPDFMessage = "BT\n/F0 " + fontSize + " Tf\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            //PDF文档实体高度

            yPos = pageDepth - pageMargin;

            strPDFMessage = pageMargin + " " + yPos + " Td\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            strPDFMessage = leadSize + " TL\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            //实体内容

            strPDFMessage = "(http://www.wenhui.org)Tj\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            strPDFMessage = "ET\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            streamEnd = mPDF.Length;

            streamLen = streamEnd - streamStart;

            strPDFMessage = "endstream\nendobj\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            //PDF文档的版本信息

            xRefs.Add(mPDF.Length);

            strPDFMessage = "2 0 obj\n" + streamLen + "\nendobj\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            xRefs.Add(mPDF.Length);

            strPDFMessage = "3 0 obj\n<</Type/Page/Parent 4 0 R/Contents 1 0 R>>\nendobj\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            xRefs.Add(mPDF.Length);

            strPDFMessage = "4 0 obj\n<</Type /Pages /Count 1\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            strPDFMessage = "/Kids[\n3 0 R\n]\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            strPDFMessage = "/Resources<</PRocSet[/PDF/Text]/Font<</F0 5 0 R>> >>\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            strPDFMessage = "/MediaBox [ 0 0 " + pageWidth + " " + pageDepth + " ]\n>>\nendobj\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            xRefs.Add(mPDF.Length);

            strPDFMessage = "5 0 obj\n<</Type/Font/Subtype/Type1/BaseFont/Courier/Encoding/WinAnsiEncoding>>\nendobj\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            xRefs.Add(mPDF.Length);

            strPDFMessage = "6 0 obj\n<</Type/Catalog/Pages 4 0 R>>\nendobj\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            streamStart = mPDF.Length;

            strPDFMessage = "xref\n0 7\n0000000000 65535 f \n";

            for (int i = 0; i < xRefs.Count; i++)

            {

                strPDFMessage += xRefFormatting((long)xRefs[i]) + " 00000 n \n";

            }

            ConvertToByteAndAddtoStream(strPDFMessage);

            strPDFMessage = "trailer\n<<\n/Size " + (xRefs.Count + 1) + "\n/Root 6 0 R\n>>\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            strPDFMessage = "startxref\n" + streamStart + "\n%%EOF\n";

            ConvertToByteAndAddtoStream(strPDFMessage);

            mPDF.WriteTo(pPDF.BaseStream);

            mPDF.Close();

            pPDF.Close();

        }

    }

}