using?System;
using?System.Drawing.Imaging;
using?System.IO;
using?iTextSharp.text.pdf;

namespace?itextsharp.ExtractImagesFromPDF
{
????public?class?PDFParser
????{
????????public?static?void?ExtractImagesFromPDF（string?sourcePdf?string?outputPath）
????????{
????????????//?NOTE:??This?will?only?get?the?first?image?it?finds?per?page.
????????????PdfReader?pdf?=?new?PdfReader（sourcePdf）;
????????????RandomAccessFileOrArray?raf?=?new?iTextSharp.text.pdf.RandomAccessFileOrArray（sourcePdf）;

????????????try
????????????{
????????????????for?（int?pageNumber?=?1;?pageNumber?<=?pdf.NumberOfPages;?pageNumber++）
????????????????{
????????????????????PdfDictionary?pg?=?pdf.GetPageN（pageNumber）;

????????????????????//?recursively?search?pages?forms?and?groups?for?images.
????????????????????Pdfobject?obj?=?FindImageInPDFDictionary（pg）;
????????????????????if?（obj?!=?null）
????????????????????{

????????????????????????int?XrefIndex?=?Convert.ToInt32（（（PRIndirectReference）obj）.Number.ToString（System.Globalization.CultureInfo.InvariantCulture））;
????????????????????????Pdfobject?pdfObj?=?pdf.GetPdfobject（XrefIndex）;
????????????????????????PdfStream?pdfStrem?=?（PdfStream）pdfObj;
????????????????????????byte[]?bytes?=?PdfReader.GetStreamBytesRaw（（PRStream）pdfStrem）;
????????????????????????if?（（bytes?!=?null））
????????????????????????{
????????????????????????????using?（System.IO.MemoryStream?memStream?=?new?System.IO.MemoryStream（bytes））
????????????????????????????{
????????????????????????????????memStream.Position?=?0;
????????????????????????????????System.Drawing.Image?img?=?System.Drawing.Image.FromStream（memStream）;
????????????????????????????????//?must?save?the?file?while?stream?is?open.
????????????????????????????????if?（!Directory.Exists（outputPath））
????????????????????????????????????Directory.CreateDirectory（outputPath）;

????????????????????????????????string?path?=?Path.Combine（outputPath?String.Format（@“{0}.jpg“?pageNumber））;
????????????????????????????????System.Drawing.Imaging.EncoderParameters?parms?=?new?System.Drawing.Imaging.EncoderParameters（1）;
????????????????????????????????parms.Param[0]?=?new?System.Drawing.Imaging.EncoderParameter（System.Drawing.Imaging.Encoder.Compression?0）;
????????????????????????????????System.Drawing.Imaging.ImageCodecInfo?jpegEncoder?=?GetImageEncoder（“JPEG“）;
????????????????????????????????img.Save（path?jpegEncoder?parms）;
????????????????????????????}
????????????????????????}
????????????????????}
????????????????}
????????????}
????????????catch
????????????{
????????????????throw;
????????????}
????????????finally
????????????{
????????????????pdf.Close（）;
????????????????raf.Close（）;
????????????}


????????}

????????private?static?Pdfobject?FindImageInPDFDictionary（PdfDictionary?pg）
????????{
????????????PdfDictionary?res?=?（PdfDictionary）PdfReader.GetPdfobject（pg.Get（PdfName.RESOURCES））;


????????????PdfDictionary?xob

?屬性????????????大小?????日期????時(shí)間???名稱(chēng)
-----------?---------??----------?-----??----
?????目錄???????????0??2012-02-16?19:30??itextsharp.ExtractImagesFromPDF\
?????文件????????2735??2012-02-16?19:24??itextsharp.ExtractImagesFromPDF\itextsharp.ExtractImagesFromPDF.csproj
?????文件?????????168??2012-02-11?14:55??itextsharp.ExtractImagesFromPDF\itextsharp.ExtractImagesFromPDF.csproj.user
?????文件????????5126??2012-02-16?19:21??itextsharp.ExtractImagesFromPDF\Program.cs
?????目錄???????????0??2012-02-16?19:17??itextsharp.ExtractImagesFromPDF\Properties\
?????文件????????1384??2012-02-11?14:37??itextsharp.ExtractImagesFromPDF\Properties\AssemblyInfo.cs