Currently I have an MVC Core v2.0.0 application that uses the .NET 4.7 framework. Inside of this I'm using iTextSharp to try and convert HTML to PDF. If I add an image to the html I get the following exception "The page 1 was requested but the document has only 0 pages".
I have tried using both a full URL and a base64 encoded content.
<img src=\"http://localhost:4808/images/sig1.png\">
<img src=\"data:application/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAIAAAD8GO2jAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAAEnQAABJ0Ad5mH3gAAADsSURBVEhLtc2NbcMgAERhz9JtImXK1gtkq46RU58K9CX+KWDpswLhdLd83dZi+fyerx24ZEMD4cQgtcOhEfnUjj+hEfyoHTU0opzUjvLar72oHW2gh+5qhzL/4/v0Dd9/qB3KnOX7L7VDmVN8b6gdyuDjcZf6Wk/vqB08qXHLwUCoHWrZcTwQaoeKthwPkFM7SsuOvQFF1Q5lXm0OKAe1QxlZ6mm3ulA7lGnVgfPUDmWKnoFQO5RB50CoHcpE/0CoHcoMDYTa0QZGB0LtKK8TBkLt4GnOQKgd+X/aQKgdMwdC7TF5IC4fiDpwW590JX1NuZQyGwAAAABJRU5ErkJggg==\" alt=\"test.png\">
Here is the helper method that does the transform
public static Stream GeneratePDF(string html, string css = null)
{
MemoryStream ms = new MemoryStream();
//HttpRenerer.PdfSharp implemenation
//PdfSharp.Pdf.PdfDocument pdf =
// TheArtOfDev.HtmlRenderer.PdfSharp.PdfGenerator.GeneratePdf(html, PdfSharp.PageSize.Letter, 40);
//pdf.Save(ms, false);
try
{
//iTextSharp implementation
//Create an iTextSharp Document which is an abstraction of a PDF but **NOT** a PDF
using (Document doc = new Document(PageSize.LETTER))
{
//Create a writer that's bound to our PDF abstraction and our stream
using (PdfWriter writer = PdfWriter.GetInstance(doc, ms))
{
writer.CloseStream = false;
if (string.IsNullOrEmpty(css))
{
//XMLWorker also reads from a TextReader and not directly from a string
using (StringReader srHtml = new StringReader(html))
{
doc.Open();
iTextSharp.tool.xml.XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, srHtml);
doc.Close();
}
}
else
{
using (MemoryStream msCss = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(css)))
using (MemoryStream msHtml = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(html)))
{
doc.Open();
iTextSharp.tool.xml.XMLWorkerHelper.GetInstance().ParseXHtml(writer, doc, msHtml, msCss);
doc.Close();
}
}
}
}
}
catch (Exception ex)
{
ms.Dispose();
throw ex;
}
//I think this is needed to use the stream to generate a file
ms.Position = 0;
return ms;
}
Here I'm calling my helper method to generate a static PDF document.
public async Task<IActionResult> TestGenerateStaticPdf()
{
//Our sample HTML and CSS
example_html = "<!doctype html><head></head><body><h1>Test Report</h1><p>Printed: 2017-09-29</p><table><tbody><tr><th>User Details</th><th>Date</th><th>Image</th></tr><tr><td>John Doe</td><td>2017-09-29</td><td><img src=\"http://localhost:4808/images/sig1.png\"></td></tr></tbody></table></body>";
example_css = "h1 {color:red;} img {max-height:180px;width:100%;page-break-inside:avoid;} table {border-collapse:collapse;width:100%;} table, th, td {border:1px solid black;padding:5px;page-break-inside:avoid;}";
System.IO.Stream stream = ControllerHelper.GeneratePDF(example_html, example_css);
return File(stream, "application/pdf", "Static Pdf.pdf");
}
