技术资料 > .Net专区 > C#语言 : 用C#代码生成一个简单的PDF文件

用C#代码生成一个简单的PDF文件

March 25,2004

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-1.1n";
         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 objn";
         ConvertToByteAndAddtoStream(strPDFMessage);
         strPDFMessage="<< /Length 2 0 R >>n";
         ConvertToByteAndAddtoStream(strPDFMessage);
         strPDFMessage="streamn";
         ConvertToByteAndAddtoStream(strPDFMessage);

         //Get the start of the stream
         streamStart=mPDF.Length;
         strPDFMessage="BTn/F0 " + fontSize +" Tfn";
         ConvertToByteAndAddtoStream(strPDFMessage);
         yPos = pageDepth - pageMargin;
         strPDFMessage=pageMargin + " " + yPos +" Tdn" ;
         ConvertToByteAndAddtoStream(strPDFMessage);
         strPDFMessage= leadSize+" TLn" ;
         ConvertToByteAndAddtoStream(strPDFMessage);

         //Add the text data to the PDF memory stream
         strPDFMessage= "(Pramod Kumar Singh)Tjn" ;
         ConvertToByteAndAddtoStream(strPDFMessage);
         strPDFMessage= "ETn";
         ConvertToByteAndAddtoStream(strPDFMessage);
         //Get the End of the stream
         streamEnd=mPDF.Length;
         //Get the Length of the stream
         streamLen=streamEnd-streamStart;
         strPDFMessage= "endstreamnendobjn";
         ConvertToByteAndAddtoStream(strPDFMessage);

         //Add 2 object to xRef
         xRefs.Add(mPDF.Length);
         strPDFMessage="2 0 objn"+ streamLen + "nendobjn";
         ConvertToByteAndAddtoStream(strPDFMessage);

         //Add Page to xRefs
         xRefs.Add(mPDF.Length);
         strPDFMessage="3 0 objn<</Type/Page/Parent 4 0 R/Contents 1 0 R>>nendobjn";
         ConvertToByteAndAddtoStream(strPDFMessage);

         //Build the Pages
         xRefs.Add(mPDF.Length);
         strPDFMessage="4 0 objn<</Type /Pages /Count 1n";
         ConvertToByteAndAddtoStream(strPDFMessage);
         strPDFMessage="/Kids[n3 0 Rn]n";
         ConvertToByteAndAddtoStream(strPDFMessage);
         strPDFMessage="/Resources<</ProcSet[/PDF/Text]/Font<</F0 5 0 R>> >>n";
         ConvertToByteAndAddtoStream(strPDFMessage);
         strPDFMessage="/MediaBox [ 0 0 "+ pageWidth + " " + pageDepth + " ]n>>nendobjn";
         ConvertToByteAndAddtoStream(strPDFMessage);

         //Add font to xRefs
         xRefs.Add(mPDF.Length);
         strPDFMessage="5 0 objn<</Type/Font/Subtype/Type1/BaseFont/Courier/Encoding/WinAnsiEncoding>>nendobjn";
         ConvertToByteAndAddtoStream(strPDFMessage);

         //Add the catalog to xRefs
         xRefs.Add(mPDF.Length);
         strPDFMessage="6 0 objn<</Type/Catalog/Pages 4 0 R>>nendobjn";
         ConvertToByteAndAddtoStream(strPDFMessage);

         //xRefs Entry
         streamStart=mPDF.Length;
         strPDFMessage="xrefn0 7n0000000000 65535 f n";
         for(int i=0;i<xRefs.Count;i++)
         {
            strPDFMessage+=xRefFormatting((long) xRefs)+" 00000 n n";
         }
         ConvertToByteAndAddtoStream(strPDFMessage);
         //Trailer for the PDF
         strPDFMessage="trailern<<n/Size "+ (xRefs.Count+1)+"n/Root 6 0 Rn>>n";
         ConvertToByteAndAddtoStream(strPDFMessage);
         //xRef location entry
         strPDFMessage="startxrefn" + streamStart+"n%%EOFn";
         ConvertToByteAndAddtoStream(strPDFMessage);
         //Write the PDF from Memory Stream to File Stream
         mPDF.WriteTo(pPDF.BaseStream);
         //Close the Stream
         mPDF.Close();
         pPDF.Close();
      }
}
}