用C#实现生成PDF文档

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();

}

}

}