// Define the HTML to PDF converter object as a class member to make it accessible in the headerHtml_NavigationCompletedEvent handler // where the header height will be automatically adjusted private HtmlToPdfConverter htmlToPdfConverter; // Indicates if a line should be drawn at the botom of the header private bool drawHeaderLine = true; private void convertToPdfButton_Click(object sender, EventArgs e) { // Create a HTML to PDF converter object with default settings htmlToPdfConverter = new HtmlToPdfConverter(); // Set license key received after purchase to use the converter in licensed mode // Leave it not set to use the converter in demo mode htmlToPdfConverter.LicenseKey = "fvDh8eDx4fHg4P/h8eLg/+Dj/+jo6Og="; // Set an adddional delay in seconds to wait for JavaScript or AJAX calls after page load completed // Set this property to 0 if you don't need to wait for such asynchcronous operations to finish htmlToPdfConverter.ConversionDelay = 2; // Enable header in the generated PDF document htmlToPdfConverter.PdfDocumentOptions.ShowHeader = true; Cursor = Cursors.WaitCursor; string headerHtmlUrl = System.IO.Path.Combine(Application.StartupPath, @"DemoAppFiles\Input\HTML_Files\Header_HTML.html"); string outPdfFile = @"DemoAppFiles\Output\HTML_to_PDF\Auto_Resize_Header_Footer.pdf"; Document documentObject = null; try { if (autoResizeHeaderRadioButton.Checked) { // Create a HTML element to be added in header HtmlToPdfElement headerHtml = new HtmlToPdfElement(headerHtmlUrl); // Install a handler where to set the automatically calculated header height headerHtml.NavigationCompletedEvent += new NavigationCompletedDelegate(headerHtml_NavigationCompletedEvent); // Add the HTML element to header // When the element is rendered in header by converter, the headerHtml_NavigationCompletedEvent handler // will be invoked and the header height will be automatically calculated htmlToPdfConverter.PdfHeaderOptions.AddElement(headerHtml); // Call the converter to produce a Document object documentObject = htmlToPdfConverter.ConvertUrlToPdfDocumentObject(urlTextBox.Text); // Uninstall the handler headerHtml.NavigationCompletedEvent -= new NavigationCompletedDelegate(headerHtml_NavigationCompletedEvent); // Draw a line at the header bottom if (drawHeaderLine) { float headerWidth = documentObject.Header.Width; float headerHeight = documentObject.Header.Height; // Create a line element for the bottom of the header LineElement headerLine = new LineElement(0, headerHeight-1, headerWidth, headerHeight-1); // Set line color headerLine.ForeColor = Color.Gray; // Add line element to the bottom of the header documentObject.Header.AddElement(headerLine); } // Save the PDF document in a memory buffer byte[] outPdfBuffer = documentObject.Save(); // Write the memory buffer in a PDF file System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer); } else { // Create a HTML to PDF element to be added in header HtmlToPdfElement headerHtml = new HtmlToPdfElement(headerHtmlUrl); // Set a fixed header height in points htmlToPdfConverter.PdfHeaderOptions.HeaderHeight = float.Parse(headerHeightTextBox.Text); // Set the HTML element to fit the container height headerHtml.FitHeight = true; // Add HTML element to fit the fixed header height htmlToPdfConverter.PdfHeaderOptions.AddElement(headerHtml); // Draw a line at the header bottom if (drawHeaderLine) { // Calculate the header width based on PDF page size and margins float headerWidth = htmlToPdfConverter.PdfDocumentOptions.PdfPageSize.Width - htmlToPdfConverter.PdfDocumentOptions.LeftMargin - htmlToPdfConverter.PdfDocumentOptions.RightMargin; // Calculate header height float headerHeight = htmlToPdfConverter.PdfHeaderOptions.HeaderHeight; // Create a line element for the bottom of the header LineElement headerLine = new LineElement(0, headerHeight-1, headerWidth, headerHeight-1); // Set line color headerLine.ForeColor = Color.Gray; // Add line element to the bottom of the header htmlToPdfConverter.PdfHeaderOptions.AddElement(headerLine); } // Convert the HTML page to a PDF document in a memory buffer byte[] outPdfBuffer = htmlToPdfConverter.ConvertUrl(urlTextBox.Text); // Write the memory buffer in a PDF file System.IO.File.WriteAllBytes(outPdfFile, outPdfBuffer); } } catch (Exception ex) { // The HTML to PDF conversion failed MessageBox.Show(String.Format("HTML to PDF Error. {0}", ex.Message)); return; } finally { // Close the PDF document if (documentObject != null) documentObject.Close(); Cursor = Cursors.Arrow; } // Open the created PDF document in default PDF viewer try { System.Diagnostics.Process.Start(outPdfFile); } catch (Exception ex) { MessageBox.Show(String.Format("Cannot open created PDF file '{0}'. {1}", outPdfFile, ex.Message)); } } /// <summary> /// This handler is called after the navigation to header HTML completed. The document header is resized in this event handler /// </summary> /// <param name="eventParams">The event parameter containing the HTML content size in pixels and points</param> void headerHtml_NavigationCompletedEvent(NavigationCompletedParams eventParams) { // Get the header HTML width and height from event parameters float headerHtmlWidth = eventParams.HtmlContentWidthPt; float headerHtmlHeight = eventParams.HtmlContentHeightPt; // Calculate the header width from coverter settings float headerWidth = htmlToPdfConverter.PdfDocumentOptions.PdfPageSize.Width - htmlToPdfConverter.PdfDocumentOptions.LeftMargin - htmlToPdfConverter.PdfDocumentOptions.RightMargin; // Calculate a resize factor to fit the header width float resizeFactor = 1; if (headerHtmlWidth > headerWidth) resizeFactor = headerWidth / headerHtmlWidth; // Calculate the header height to preserve the HTML aspect ratio float headerHeight = headerHtmlHeight * resizeFactor; if (!(headerHeight < htmlToPdfConverter.PdfDocumentOptions.PdfPageSize.Height - htmlToPdfConverter.PdfDocumentOptions.TopMargin - htmlToPdfConverter.PdfDocumentOptions.BottomMargin)) { throw new Exception("The header height cannot be bigger than PDF page height"); } // Set the calculated header height htmlToPdfConverter.PdfDocumentOptions.DocumentObject.Header.Height = headerHeight; }