csharp: iTextSharp get Text or Image

 

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using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Text; using iTextSharp.text.pdf; using iTextSharp; using iTextSharp.text.pdf.parser; using Dotnet = System.Drawing.Image;     namespace OfficeDoumentWebApp {         /// <summary>     /// geovindu,Geovin Du, 涂聚文     /// pdf     /// </summary>     public partial class ItexPDFForm : System.Web.UI.Page     {         string imgPath="geovindu";         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         protected void Page_Load(object sender, EventArgs e)         {             StringBuilder sb = new StringBuilder();                       try             {                   if(!IsPostBack)                 {                     //Server.MapPath                     string datafile = DateTime.Now.ToString("yyyyMMddHHmmssfff");                     string urc = Server.MapPath("OutFile/" + datafile + "/");                     if (!Directory.Exists(urc))                     {                         Directory.CreateDirectory(urc);                     }                       imgPath = urc;                         string sourcefile = Server.MapPath("SourceFile/珠宝RFID实施方案.pdf");  //珠宝RFID实施方案                         //if (!Directory.Exists(urc))                         // Directory.CreateDirectory(urc);                                           //  ItexPDFParser.ExtractImagesFromPDF(Server.MapPath("SourceFile/珠宝RFID实施方案.pdf"), urc);                           PdfReader pdfReader = new PdfReader(sourcefile);                     PdfReaderContentParser parser = new PdfReaderContentParser(pdfReader);                     //ExtRenderListener extRenderListener = new ExtRenderListener();                       for (int pageNumber = 1; pageNumber <= pdfReader.NumberOfPages; pageNumber++)                     {                           //PdfReader pdf = new PdfReader(pdfFile);                         PdfDictionary pg = pdfReader.GetPageN(pageNumber);                         PdfDictionary res = (PdfDictionary)PdfReader.GetPdfObject(pg.Get(PdfName.RESOURCES));                         PdfDictionary xobj = (PdfDictionary)PdfReader.GetPdfObject(res.Get(PdfName.XOBJECT));                           //获取文本内容                       string tex= PdfTextExtractor.GetTextFromPage(pdfReader, pageNumber);                         sb.Append(tex);                           if (!object.Equals(xobj, null))                         {                             foreach (PdfName name in xobj.Keys)                             {                                 PdfObject obj = xobj.Get(name);                                 if (obj.IsIndirect())                                 {                                     PdfDictionary tg = (PdfDictionary)PdfReader.GetPdfObject(obj);                                     string width = tg.Get(PdfName.WIDTH).ToString();                                     string height = tg.Get(PdfName.HEIGHT).ToString();                                     //TextRenderInfo inf=pdfReader.                                     GraphicsState state = new GraphicsState();                                     // state=                                     //state = (GraphicsState)(new Matrix(float.Parse(width), float.Parse(height)));                                     ImageRenderInfo imgRI = ImageRenderInfo.CreateForXObject(state, (PRIndirectReference)obj, tg);                                     if (!Object.Equals(imgRI, null))                                     {                                         RenderImage(imgRI, pageNumber); //图片没有读出                                     }                                     }                             }                         }                     }                                             }               }             catch(Exception ex)             {                 Response.Write(ex.Message.ToString());               }             Response.Write(sb.ToString());         }         /// <summary>         ///         /// </summary>         /// <param name="renderInfo"></param>         /// <returns></returns>         GraphicsState getGraphicsState(PathPaintingRenderInfo renderInfo)         {             System.Reflection.FieldInfo gsField = typeof(PathPaintingRenderInfo).GetField("gs", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);             return (GraphicsState)gsField.GetValue(renderInfo);         }             /// <summary>         /// 提取图片         /// geovindu,Geovin Du         /// 涂聚文         /// </summary>         /// <param name="renderInfo"></param>           private void RenderImage(ImageRenderInfo renderInfo,int number)         {             PdfImageObject image = renderInfo.GetImage();             using (Dotnet dotnetImg = image.GetDrawingImage())             {                 if (dotnetImg != null)                 {                     using (MemoryStream ms = new MemoryStream())                     {                         dotnetImg.Save(ms, ImageFormat.Jpeg); //Tiff                         Bitmap d = new Bitmap(dotnetImg);                         string f = imgPath + number + ".jpg";                         d.Save(imgPath+number+".jpg");                     }                 }             }         }         } }

　　

 

 

ABCpdf.NET
https://www.nuget.org/packages/ABCpdf
http://test.websupergoo.com/helppdfnet/default.htm?page=source%2f3-concepts%2fg-htmlrender.htm