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< >\nendobj\n " ;
ConvertToByteAndAddtoStream(strPDFMessage);

xRefs.Add(mPDF.Length);
strPDFMessage = " 4 0 obj\n< > >>\n " ;
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage = " /MediaBox [ 0 0 " + pageWidth + " " + pageDepth + " ]\n>>\nendobj\n " ;
ConvertToByteAndAddtoStream(strPDFMessage);

xRefs.Add(mPDF.Length);
strPDFMessage = " 5 0 obj\n< >\nendobj\n " ;
ConvertToByteAndAddtoStream(strPDFMessage);

xRefs.Add(mPDF.Length);
strPDFMessage = " 6 0 obj\n< >\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();
}
}
}