//write by wenhui.org

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();

}

}

}