用C#实现生成PDF文档

 

用C#实现生成PDF文档

g 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();

}

}

}