用C#实现生成PDF文档的方法

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 ";
ConvertToByteAndAddtoStream(strPDFMessage);
xRefs.Add(mPDF.Length);
strPDFMessage = "1 0 obj ";
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage = "<< /Length 2 0 R >> ";
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage = "stream ";
ConvertToByteAndAddtoStream(strPDFMessage);
/**/
////////PDF文档描述
streamStart = mPDF.Length;
//字体
strPDFMessage = "BT /F0 " + fontSize + " Tf ";
ConvertToByteAndAddtoStream(strPDFMessage);
//PDF文档实体高度
yPos = pageDepth - pageMargin;
strPDFMessage = pageMargin + " " + yPos + " Td ";
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage = leadSize + " TL ";
ConvertToByteAndAddtoStream(strPDFMessage);
//实体内容
strPDFMessage = "(http://www.wenhui.org)Tj ";
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage = "ET ";
ConvertToByteAndAddtoStream(strPDFMessage);
streamEnd = mPDF.Length;
streamLen = streamEnd - streamStart;
strPDFMessage = "endstream endobj ";
ConvertToByteAndAddtoStream(strPDFMessage);
//PDF文档的版本信息
xRefs.Add(mPDF.Length);
strPDFMessage = "2 0 obj " + streamLen + " endobj ";
ConvertToByteAndAddtoStream(strPDFMessage);
xRefs.Add(mPDF.Length);
strPDFMessage = "3 0 obj <</Type/Page/Parent 4 0 R/Contents 1 0 R>> endobj ";
ConvertToByteAndAddtoStream(strPDFMessage);
xRefs.Add(mPDF.Length);
strPDFMessage = "4 0 obj <</Type /Pages /Count 1 ";
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage = "/Kids[ 3 0 R ] ";
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage = "/Resources<</ProcSet[/PDF/Text]/Font<</F0 5 0 R>> >> ";
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage = "/MediaBox [ 0 0 " + pageWidth + " " + pageDepth + " ] >> endobj ";
ConvertToByteAndAddtoStream(strPDFMessage);
xRefs.Add(mPDF.Length);
strPDFMessage = "5 0 obj <</Type/Font/Subtype/Type1/BaseFont/Courier/Encoding/WinAnsiEncoding>> endobj ";
ConvertToByteAndAddtoStream(strPDFMessage);
xRefs.Add(mPDF.Length);
strPDFMessage = "6 0 obj <</Type/Catalog/Pages 4 0 R>> endobj ";
ConvertToByteAndAddtoStream(strPDFMessage);
streamStart = mPDF.Length;
strPDFMessage = "xref 0 7 0000000000 65535 f ";
for (int i = 0; i < xRefs.Count; i++)
{
strPDFMessage += xRefFormatting((long)xRefs[i]) + " 00000 n ";
}
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage = "trailer << /Size " + (xRefs.Count + 1) + " /Root 6 0 R >> ";
ConvertToByteAndAddtoStream(strPDFMessage);
strPDFMessage = "startxref " + streamStart + " %%EOF ";
ConvertToByteAndAddtoStream(strPDFMessage);
mPDF.WriteTo(pPDF.BaseStream);
mPDF.Close();
pPDF.Close();
}
}
}