Czy itextsharp.xmlworker może wyświetlać osadzone obrazy?

Chciałbym tworzyć dynamiczne dokumenty PDF za pomocą HTML i obrazów dynamicznych. Mój kod działa poprawnie ze standardowego HTML i pełne ścieżki do obrazów, ale gdy próbuję osadzić inline obrazu w dokumencie pojawia się błądCzy itextsharp.xmlworker może wyświetlać osadzone obrazy?

wyjątków szczegóły: System.IO.IOException: Dokument nie ma strony .

Czy istnieje sposób na osadzanie obrazów bez wywołania HTTP na obraz? Nie chcę tego, ponieważ myślę, że spowoduje to problemy ze skalowalnością, a obrazy są wrażliwe.

Tu jest mój kod, który daje IOException:

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"); 
       } 
      } 
     } 
    }

Źródło

2013-10-15 David Silva Smith

Musimy napisać własną ImageTagProcessor wspierać przetwarzanie bazy 64 obrazów:

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); 
     } 
    } 
}

Wtedy możemy wstrzyknąć ten nowy procesor do 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");

Źródło

2013-10-16 08:22:08 VahidN

Dobra robota! Próbowałem uzyskać niestandardowe 'IImageProvider' do pracy, ale nigdy nie myślałem o wypróbowaniu niestandardowego tagu' img'! –

Awesome! Czytałem o tym dziś rano http://demo.itextsupport.com/xmlworker/itextdoc/flatsite.html, ale jeszcze nie rozpocząłem implementacji. Dziękuję za szybką odpowiedź! –

Przykładowy egzemplarz. Ale kod działa świetnie, ale w Acrobat Reader pierwsza strona nie jest poprawnie renderowana. Tekst nie jest wyświetlany. Czy jest jakiś znany problem z tym? – 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]

Źródło

2017-12-06 17:30:41

Twoja odpowiedź całkowicie ignoruje fakt, że operacja jest pytaniem o to w przypadku użycia html-to-pdf ... – mkl

Czy itextsharp.xmlworker może wyświetlać osadzone obrazy?

Odpowiedz

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