用C#代码生成一个简单的PDF文件

using System;
using System.IO;
using System.Text;
using System.Collections;

namespace PDFGenerator
{
     /// <summary>
     /// Application : Generation of PDF file from text
     /// Author         : Pramod Kumar Singh
     /// Date         : 25th July 2001
     ///</summary>
        
     public class PDFGenerator
     {
         static float pageWidth = 594.0f;
         static float pageDepth = 828.0f;
         static float pageMargin = 30.0f;
         static float fontSize = 10.0f;
         static float leadSize = 10.0f;
        
         //Create a PDF file.
         //PDF on Disk
         static StreamWriter pPDF=new StreamWriter("F:\\Temp\\myPDF.pdf");
         //PDF in Memory
         static MemoryStream mPDF= new MemoryStream();
        
         //Convert the Text Data to PDF format and write back to
         //Memory Stream
         static void ConvertToByteAndAddtoStream(string strMsg)
         {
             Byte[] buffer=null;
             buffer=ASCIIEncoding.ASCII.GetBytes(strMsg);
             mPDF.Write(buffer,0,buffer.Length);  
             buffer=null;
         }
        
         //Format the data length in xRef Format
         static string xRefFormatting(long xValue)
         {
             string strMsg =xValue.ToString();
             int iLen=strMsg.Length;
             if (iLen<10)
             {
                 StringBuilder s=new StringBuilder();
                 //string s=null;
                 int i=10-iLen;
                 s.Append('0',i);
                 strMsg=s.ToString() + strMsg;
             }
             return strMsg;
         }

         //Entry Point
         static void Main(string[] args)
         {
             //Create a ArrayList for xRefs of PDF Document
             ArrayList xRefs=new ArrayList();
             Byte[] buffer=null;
             float yPos =0f;
             long streamStart=0;
             long streamEnd=0;
             long streamLen =0;
             string strPDFMessage=null;
             //PDF Header Message
             strPDFMessage="%PDF-1.1\n";
             ConvertToByteAndAddtoStream(strPDFMessage);
            
             //ID 1 For Containt
             //ID 2 For Length of the Stream
             //write the Text
            
             //1> Start a new Page
             xRefs.Add(mPDF.Length);
             strPDFMessage="1 0 obj\n";
             ConvertToByteAndAddtoStream(strPDFMessage);
             strPDFMessage="<< /Length 2 0 R >>\n";
             ConvertToByteAndAddtoStream(strPDFMessage);
             strPDFMessage="stream\n";
             ConvertToByteAndAddtoStream(strPDFMessage);
            
             //Get the start of the stream
             streamStart=mPDF.Length;
             strPDFMessage="BT\n/F0 " + fontSize +" Tf\n";
             ConvertToByteAndAddtoStream(strPDFMessage);
             yPos = pageDepth - pageMargin;
             strPDFMessage=pageMargin + " " + yPos +" Td\n" ;
             ConvertToByteAndAddtoStream(strPDFMessage);
             strPDFMessage= leadSize+" TL\n" ;
             ConvertToByteAndAddtoStream(strPDFMessage);
            
             //Add the text data to the PDF memory stream
             strPDFMessage= "(Pramod Kumar Singh)Tj\n" ;
             ConvertToByteAndAddtoStream(strPDFMessage);
             strPDFMessage= "ET\n";
             ConvertToByteAndAddtoStream(strPDFMessage);
             //Get the End of the stream
             streamEnd=mPDF.Length;
             //Get the Length of the stream
             streamLen=streamEnd-streamStart;
             strPDFMessage= "endstream\nendobj\n";
             ConvertToByteAndAddtoStream(strPDFMessage);
                    
             //Add 2 object to xRef
             xRefs.Add(mPDF.Length);
             strPDFMessage="2 0 obj\n"+ streamLen + "\nendobj\n";
             ConvertToByteAndAddtoStream(strPDFMessage);
                        
             //Add Page to xRefs
             xRefs.Add(mPDF.Length);
             strPDFMessage="3 0 obj\n<</Type/Page/Parent 4 0 R/Contents 1 0 R>>\nendobj\n";
             ConvertToByteAndAddtoStream(strPDFMessage);
            
             //Build the Pages
             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);
            
             //Add font to xRefs
             xRefs.Add(mPDF.Length);
             strPDFMessage="5 0 obj\n<</Type/Font/Subtype/Type1/BaseFont/Courier/Encoding/WinAnsiEncoding>>\nendobj\n";
             ConvertToByteAndAddtoStream(strPDFMessage);
                    
             //Add the catalog to xRefs
             xRefs.Add(mPDF.Length);
             strPDFMessage="6 0 obj\n<</Type/Catalog/Pages 4 0 R>>\nendobj\n";
             ConvertToByteAndAddtoStream(strPDFMessage);
                        
             //xRefs Entry
             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);
             //Trailer for the PDF
             strPDFMessage="trailer\n<<\n/Size "+ (xRefs.Count+1)+"\n/Root 6 0 R\n>>\n";
             ConvertToByteAndAddtoStream(strPDFMessage);
             //xRef location entry
             strPDFMessage="startxref\n" + streamStart+"\n%%EOF\n";
             ConvertToByteAndAddtoStream(strPDFMessage);
             //Write the PDF from Memory Stream to File Stream
             mPDF.WriteTo(pPDF.BaseStream);
             //Close the Stream
             mPDF.Close();
             pPDF.Close();
         }
     }
}