用C#實現生成PDF文檔的方法

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文檔頭信息   
                 strPDFMessage = "%PDF-1.1 ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 xRefs.Add(mPDF.Length);   
                 strPDFMessage = "1 0 obj ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 strPDFMessage = "<< /Length 2 0 R >> ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 strPDFMessage = "stream ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                /**/   
                ////////PDF文檔描述   
                 streamStart = mPDF.Length;   
                //字體   
                 strPDFMessage = "BT /F0 " + fontSize + " Tf ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                //PDF文檔實體高度   
                 yPos = pageDepth - pageMargin;   
                 strPDFMessage = pageMargin + " " + yPos + " Td ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 strPDFMessage = leadSize + " TL ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                //實體內容   
                 strPDFMessage = "(http://www.wenhui.org)Tj ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 strPDFMessage = "ET ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 streamEnd = mPDF.Length;   
                 streamLen = streamEnd - streamStart;   
                 strPDFMessage = "endstream endobj ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                //PDF文檔的版本信息   
                 xRefs.Add(mPDF.Length);   
                 strPDFMessage = "2 0 obj " + streamLen + " endobj ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 xRefs.Add(mPDF.Length);   
                 strPDFMessage = "3 0 obj <</Type/Page/Parent 4 0 R/Contents 1 0 R>> endobj ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 xRefs.Add(mPDF.Length);   
                 strPDFMessage = "4 0 obj <</Type /Pages /Count 1 ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 strPDFMessage = "/Kids[ 3 0 R ] ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 strPDFMessage = "/Resources<</ProcSet[/PDF/Text]/Font<</F0 5 0 R>> >> ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 strPDFMessage = "/MediaBox [ 0 0 " + pageWidth + " " + pageDepth + " ] >> endobj ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 xRefs.Add(mPDF.Length);   
                 strPDFMessage = "5 0 obj <</Type/Font/Subtype/Type1/BaseFont/Courier/Encoding/WinAnsiEncoding>> endobj ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 xRefs.Add(mPDF.Length);   
                 strPDFMessage = "6 0 obj <</Type/Catalog/Pages 4 0 R>> endobj ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 streamStart = mPDF.Length;   
                 strPDFMessage = "xref 0 7 0000000000 65535 f ";   
                for (int i = 0; i < xRefs.Count; i++)   
                 {   
                      strPDFMessage += xRefFormatting((long)xRefs) + " 00000 n ";   
                 }   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 strPDFMessage = "trailer << /Size " + (xRefs.Count + 1) + " /Root 6 0 R >> ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 strPDFMessage = "startxref " + streamStart + " %%EOF ";   
                 ConvertToByteAndAddtoStream(strPDFMessage);   
                 mPDF.WriteTo(pPDF.BaseStream);   
                 mPDF.Close();   
                 pPDF.Close();   
           }   
      }   
}