iTextSharp + FileStream = Corrupt PDF file

Question

I am trying to create a pdf file with iTextSharp. My attempt writes the content of the pdf to a MemoryStream so I can write the result both into file and a database BLOB. The file gets created, has a size of about 21kB and it looks like a pdf when opend with Notepad++. But my PDF viewer says it's currupted. Here is a little code snippet (only tries to write to a file, not to a database):

Document myDocument = new Document();
MemoryStream myMemoryStream = new MemoryStream();
PdfWriter myPDFWriter = PdfWriter.GetInstance(myDocument, myMemoryStream);
myDocument.Open();
// Content of the pdf gets inserted here
using (FileStream fs = File.Create("D:\\...\\aTestFile.pdf"))
{
    myMemoryStream.WriteTo(fs);
}
myMemoryStream.Close();

Where is the mistake I make?

Thank you, Norbert

Answer 1

I think your problem was that you weren't properly adding content to your PDF. This is done through the Document.Add() method and you finish up by calling Document.Close().

When you call Document.Close() however, your MemoryStream also closes so you won't be able to write it to your FileStream as you have. You can get around this by storing the content of your MemoryStream to a byte array.

The following code snippet works for me:

using (MemoryStream myMemoryStream = new MemoryStream()) {
    Document myDocument = new Document();
    PdfWriter myPDFWriter = PdfWriter.GetInstance(myDocument, myMemoryStream);

    myDocument.Open();

    // Add to content to your PDF here...
    myDocument.Add(new Paragraph("I hope this works for you."));

    // We're done adding stuff to our PDF.
    myDocument.Close();

    byte[] content = myMemoryStream.ToArray();

    // Write out PDF from memory stream.
    using (FileStream fs = File.Create("aTestFile.pdf")) {
        fs.Write(content, 0, (int)content.Length);
    }
}