CODEWITHSUNDEEP
c#itext
user2586856
user2586856

Reputation:

Convert html to pdf and merge it with existing pdfs

I have a System.Net.Mail.MailMessage which shall have it's html body and pdf attachments converted into one single pdf.

Converting the html body to pdf works for me with this answer

Converting the pdf attachments into one pdf works for me with this answer

However after ~10 hours of trying I can not come up with a combined solution which does both. All I'm getting are NullReferenceExceptions somewhere in IText source, "the document is not open", etc...

For example, this will throw no error but the resulting pdf will only contain the attachments but not the html email body:

Document document = new Document();
StringReader sr = new StringReader(mail.Body);
HTMLWorker htmlparser = new HTMLWorker(document);
using (FileStream fs = new FileStream(targetPath, FileMode.Create))
{
    PdfCopy writer = new PdfCopy(document, fs);
    document.Open();
    htmlparser.Parse(sr);

    foreach (string fileName in pdfList)
    {
        PdfReader reader = new PdfReader(fileName);
        reader.ConsolidateNamedDestinations();
        for (int i = 1; i <= reader.NumberOfPages; i++)
        {
            PdfImportedPage page = writer.GetImportedPage(reader, i);
            writer.AddPage(page);
        }
        PRAcroForm form = reader.AcroForm;
        if (form != null)
        {
            writer.CopyAcroForm(reader);
        }
        reader.Close();
    }
    writer.Close();
    document.Close();
}

I'm using the LGPL licensed ITextSharp 4.1.6

Upvotes: 0

Views: 1784

Answers (1)

COeDev
COeDev

Reputation: 356

From v4.1.6 fanboy to v4.1.6 fanboy :D

Looks like the HTMLWorker is closing the documents stream right after parsing. So as a workaround, you could create a pdf from your mailbody in memory. And then add this one together with the attachment to your final pdf.

Here is some code, that should do the trick:

  StringReader htmlStringReader = new StringReader("<html><body>Hello World!!!!!!</body></html>");

  byte[] htmlResult;

  using (MemoryStream htmlStream = new MemoryStream())
  {
    Document htmlDoc = new Document();
    PdfWriter htmlWriter = PdfWriter.GetInstance(htmlDoc, htmlStream);
    htmlDoc.Open();

    HTMLWorker htmlWorker = new HTMLWorker(htmlDoc);
    htmlWorker.Parse(htmlStringReader);

    htmlDoc.Close();
    htmlResult = htmlStream.ToArray();
  }

  byte[] pdfResult;

  using (MemoryStream pdfStream = new MemoryStream())
  {
    Document doc = new Document();
    PdfCopy copyWriter = new PdfCopy(doc, pdfStream);
    doc.Open();

    PdfReader htmlPdfReader = new PdfReader(htmlResult);
    AppendPdf(copyWriter, htmlPdfReader); // your foreach pdf code here
    htmlPdfReader.Close();

    PdfReader attachmentReader = new PdfReader("C:\\temp\\test.pdf");
    AppendPdf(copyWriter, attachmentReader);
    attachmentReader.Close();

    doc.Close();

    pdfResult = pdfStream.ToArray();
  }

  using (FileStream fs = new FileStream("C:\\temp\\test2.pdf", FileMode.Create, FileAccess.Write))
  {
    fs.Write(pdfResult, 0, pdfResult.Length);
  }

private void AppendPdf(PdfCopy writer, PdfReader reader)
{
  for (int i = 1; i <= reader.NumberOfPages; i++)
  {
    PdfImportedPage page = writer.GetImportedPage(reader, i);        
    writer.AddPage(page);
  }
}

Ofc you could directly use a FileStream for the final document instead of a MemoryStream as well.

Upvotes: 1

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