Kann itextsharp.xmlworker eingebettete Bilder rendern?

Ich möchte dynamische PDF-Dokumente mit HTML und dynamischen Bildern erstellen. Mein Code funktioniert mit Standard-HTML und vollständigen Pfade für die Bilder, aber wenn ich versuche, das Bild inline in dem Dokument, das ich den FehlerKann itextsharp.xmlworker eingebettete Bilder rendern?

Ausnahmedetails erhalten einzubetten: System.IO.IOException: Das Dokument hat keine Seiten .

Gibt es eine Möglichkeit, die Bilder ohne einen HTTP-Aufruf pro Bild einzubetten? Ich möchte das nicht, weil ich denke, dass es Probleme mit der Skalierbarkeit verursacht und die Bilder empfindlich sind.

Hier ist mein Code, der die IOException gibt:

public ActionResult MakePdf() 
    { 
     string html = @"<?xml version=""1.0"" encoding=""UTF-8""?> 
      <!DOCTYPE html 
       PUBLIC ""-//W3C//DTD XHTML 1.0 Strict//EN"" 
       ""http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd""> 
      <html xmlns=""http://www.w3.org/1999/xhtml"" xml:lang=""en"" lang=""en""> 
       <head> 
        <title>Minimal XHTML 1.0 Document with W3C DTD</title> 
       </head> 
       <body><img src='data:image/png;base64,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' width='62' height='80' style='float: left; margin-right: 28px;' /></body></html>"; 

     var bytes = Encoding.UTF8.GetBytes(html); 

     using (MemoryStream input = new MemoryStream(bytes)) 
     { 
      MemoryStream output = new MemoryStream(); 
      using (Document document = new Document(PageSize.LETTER, 50, 50, 50, 50)) 
      { 
       using (PdfWriter writer = PdfWriter.GetInstance(document, output)) 
       { 
        writer.CloseStream = false; 
        document.Open(); 

        XMLWorkerHelper xmlWorker = XMLWorkerHelper.GetInstance(); 
        xmlWorker.ParseXHtml(writer, document, input, null); 
        document.Close(); 
        output.Position = 0; 

        return new FileStreamResult(output, "application/pdf"); 
       } 
      } 
     } 
    }

Quelle

2013-10-15 David Silva Smith

Wir müssen unsere eigene ImageTagProcessor schreiben Verarbeitung von Basis 64 Bilder zu unterstützen:

public class CustomImageTagProcessor : iTextSharp.tool.xml.html.Image 
{ 
    public override IList<IElement> End(IWorkerContext ctx, Tag tag, IList<IElement> currentContent) 
    { 
     IDictionary<string, string> attributes = tag.Attributes; 
     string src; 
     if (!attributes.TryGetValue(HTML.Attribute.SRC, out src)) 
      return new List<IElement>(1); 

     if (string.IsNullOrEmpty(src)) 
      return new List<IElement>(1); 

     if (src.StartsWith("data:image/", StringComparison.InvariantCultureIgnoreCase)) 
     { 
      // data:[<MIME-type>][;charset=<encoding>][;base64],<data> 
      var base64Data = src.Substring(src.IndexOf(",") + 1); 
      var imagedata = Convert.FromBase64String(base64Data); 
      var image = iTextSharp.text.Image.GetInstance(imagedata); 

      var list = new List<IElement>(); 
      var htmlPipelineContext = GetHtmlPipelineContext(ctx); 
      list.Add(GetCssAppliers().Apply(new Chunk((iTextSharp.text.Image)GetCssAppliers().Apply(image, tag, htmlPipelineContext), 0, 0, true), tag, htmlPipelineContext)); 
      return list; 
     } 
     else 
     { 
      return base.End(ctx, tag, currentContent); 
     } 
    } 
}

Dann können wir diesen neuen Prozessor injizieren in die HtmlPipelineContext:

 using (var doc = new Document(PageSize.A4)) 
     { 
      var writer = PdfWriter.GetInstance(doc, new FileStream("test.pdf", FileMode.Create)); 
      doc.Open(); 
      var html = @"<img src='data:image/png;base64,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' width='62' height='80' style='float: left; margin-right: 28px;' />"; 

      var tagProcessors = (DefaultTagProcessorFactory)Tags.GetHtmlTagProcessorFactory(); 
      tagProcessors.RemoveProcessor(HTML.Tag.IMG); // remove the default processor 
      tagProcessors.AddProcessor(HTML.Tag.IMG, new CustomImageTagProcessor()); // use our new processor 

      CssFilesImpl cssFiles = new CssFilesImpl(); 
      cssFiles.Add(XMLWorkerHelper.GetInstance().GetDefaultCSS()); 
      var cssResolver = new StyleAttrCSSResolver(cssFiles); 
      cssResolver.AddCss(@"code { padding: 2px 4px; }", "utf-8", true); 
      var charset = Encoding.UTF8; 
      var hpc = new HtmlPipelineContext(new CssAppliersImpl(new XMLWorkerFontProvider())); 
      hpc.SetAcceptUnknown(true).AutoBookmark(true).SetTagFactory(tagProcessors); // inject the tagProcessors 
      var htmlPipeline = new HtmlPipeline(hpc, new PdfWriterPipeline(doc, writer)); 
      var pipeline = new CssResolverPipeline(cssResolver, htmlPipeline); 
      var worker = new XMLWorker(pipeline, true); 
      var xmlParser = new XMLParser(true, worker, charset); 
      xmlParser.Parse(new StringReader(html)); 
     } 
     Process.Start("test.pdf");

Quelle

2013-10-16 08:22:08 VahidN

Gute Arbeit! Ich habe versucht, einen benutzerdefinierten 'ImageProvider' zu erstellen, aber ich habe nie daran gedacht, ein benutzerdefiniertes' img' -Tag auszuprobieren! –

Super! Ich habe das heute Morgen http://demo.itextsupport.com/xmlworker/itextdoc/flatsite.html gelesen, aber ich habe die Implementierung noch nicht gestartet. Danke für die schnelle Antwort! –

Beispiel gelesen. Aber der Code funktioniert gut, aber in Acrobat Reader wird die erste Seite nicht korrekt gerendert. Text wird nicht angezeigt. Gibt es ein bekanntes Problem? – dixus

  string originalFile = "Original1.pdf"; 
      string copyOfOriginal = "Re-copia.pdf"; 

      byte[] bytes = Convert.FromBase64String(archivo); 

      System.IO.FileStream stream = new FileStream(originalFile, FileMode.CreateNew); 
      System.IO.BinaryWriter writer = new BinaryWriter(stream); 
      writer.Write(bytes, 0, bytes.Length); 
      writer.Close(); 

      PdfReader reader1 = new PdfReader(originalFile); 
      using (FileStream fs = new FileStream(copyOfOriginal, FileMode.Create, FileAccess.Write, FileShare.None)) 
      // Creating iTextSharp.text.pdf.PdfStamper object to write 
      // Data from iTextSharp.text.pdf.PdfReader object to FileStream object 
      using (PdfStamper stamper = new PdfStamper(reader1, fs)) 
      { 

       int pageCount = reader1.NumberOfPages; 

       // Create New Layer for Watermark 
       PdfLayer layer = new PdfLayer("WatermarkLayer", stamper.Writer); 
       // Loop through each Page 
       for (int i = pageCount; i <= pageCount; i++) 
       { 
        // Getting the Page Size 
        Rectangle rect = reader1.GetPageSize(i); 



        // Get the ContentByte object 
        PdfContentByte cb = stamper.GetUnderContent(i); 

        // Tell the cb that the next commands should be "bound" to this new layer 
        cb.BeginLayer(layer); 
        cb.SetFontAndSize(BaseFont.CreateFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED), 50); 

        PdfGState gState = new PdfGState(); 
        cb.SetGState(gState); 


        string codbartest = codBarras; 
        BarcodePDF417 bcpdf417 = new BarcodePDF417(); 
        //Asigna el código de barras en base64 a la propiedad text del objeto.. 
        bcpdf417.Text = ASCIIEncoding.ASCII.GetBytes(codbartest); 
        Image imgpdf417 = bcpdf417.GetImage(); 
        imgpdf417.SetAbsolutePosition(50, 50); 
        imgpdf417.ScalePercent(100); 
        cb.AddImage(imgpdf417); 
        // Close the layer 
        cb.EndLayer(); 
       }[enter image description here][1]

Quelle

2017-12-06 17:30:41

Ihre Antwort ignoriert vollständig, dass das op in einem html-to-pdf-Anwendungsfall darüber nachfragt ... – mkl

Kann itextsharp.xmlworker eingebettete Bilder rendern?

Antwort

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