ChinaITLab 收集整理 
2004-8-9 
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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(); } } } | |
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