private void convertToPdfButton_Click(object sender, EventArgs e) { // Create a HTML to PDF converter object with default settings HtmlToPdfConverter 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="; // Select the HTML elements for which to retrieve location and other information from HTML document htmlToPdfConverter.HtmlElementsMappingOptions.HtmlElementSelectors = new string[] { htmlElementsSelectorTextBox.Text }; Cursor = Cursors.WaitCursor; // Convert HTML to PDF using the settings above string outPdfFile = @"DemoAppFiles\Output\HTML_to_PDF\Select_in_API_HTML_Elements_to_Retrieve.pdf"; Document pdfDocument = null; try { // Convert HTML page to a PDF document object which can be further modified to highlight the selected elements pdfDocument = htmlToPdfConverter.ConvertUrlToPdfDocumentObject(urlTextBox.Text); // Highlight the selected elements in PDF with colored rectangles foreach (HtmlElementMapping htmlElementInfo in htmlToPdfConverter.HtmlElementsMappingOptions.HtmlElementsMappingResult) { // Get other information about HTML element string htmlElementTagName = htmlElementInfo.HtmlElementTagName; string htmlElementID = htmlElementInfo.HtmlElementId; // Hightlight the HTML element in PDF // A HTML element can span over many PDF pages and therefore the mapping of the HTML element in PDF document consists // in a list of rectangles, one rectangle for each PDF page where this element was rendered foreach (HtmlElementPdfRectangle htmlElementLocationInPdf in htmlElementInfo.PdfRectangles) { // Get the HTML element location in PDF page PdfPage htmlElementPdfPage = htmlElementLocationInPdf.PdfPage; RectangleF htmlElementRectangleInPdfPage = htmlElementLocationInPdf.Rectangle; // Highlight the HTML element element with a colored rectangle in PDF RectangleElement highlightRectangle = new RectangleElement(htmlElementRectangleInPdfPage.X, htmlElementRectangleInPdfPage.Y, htmlElementRectangleInPdfPage.Width, htmlElementRectangleInPdfPage.Height); if (htmlElementTagName.ToLower() == "h1") highlightRectangle.ForeColor = Color.Blue; else if (htmlElementTagName.ToLower() == "h2") highlightRectangle.ForeColor = Color.Green; else if (htmlElementTagName.ToLower() == "h3") highlightRectangle.ForeColor = Color.Red; else if (htmlElementTagName.ToLower() == "h4") highlightRectangle.ForeColor = Color.Yellow; else if (htmlElementTagName.ToLower() == "h5") highlightRectangle.ForeColor = Color.Indigo; else if (htmlElementTagName.ToLower() == "h6") highlightRectangle.ForeColor = Color.Orange; else highlightRectangle.ForeColor = Color.Navy; highlightRectangle.LineStyle.LineDashStyle = LineDashStyle.Solid; htmlElementPdfPage.AddElement(highlightRectangle); } } // Save the PDF document in a memory buffer byte[] outPdfBuffer = pdfDocument.Save(); // 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 (pdfDocument != null) pdfDocument.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)); } }