Select in API the HTML Elements for which to Retrieve Location

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using System.Drawing;

// Use EVO PDF Namespace
using EvoPdfClient;

namespace EvoHtmlToPdfDemo.HTML_to_PDF.HTML_Elements_Location
{
    public partial class Select_in_API_Elements_to_Retrieve : System.Web.UI.Page
    {
        protected void convertToPdfButton_Click(object sender, EventArgs e)
        {
            // Get the server IP and port
            String serverIP = textBoxServerIP.Text;
            uint serverPort = uint.Parse(textBoxServerPort.Text);

            // Create a HTML to PDF converter object
            HtmlToPdfConverter htmlToPdfConverter = null;
            if (radioButtonUseTcpService.Checked)
                htmlToPdfConverter = new HtmlToPdfConverter(serverIP, serverPort);
            else
                htmlToPdfConverter = new HtmlToPdfConverter(true, textBoxWebServiceUrl.Text);

            // Set optional service password
            if (textBoxServicePassword.Text.Length > 0)
                htmlToPdfConverter.ServicePassword = textBoxServicePassword.Text;

            // 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 = "4W9+bn19bn5ue2B+bn1/YH98YHd3d3c=";

            // 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;

            // Select the HTML elements for which to retrieve location and other information from HTML document
            htmlToPdfConverter.HtmlElementsMappingOptions.HtmlElementSelectors = new string[] { htmlElementsSelectorTextBox.Text };

            // Convert HTML page to a PDF document object which can be further modified to highlight the selected elements
            Document pdfDocument = htmlToPdfConverter.ConvertUrlToPdfDocumentObject(urlTextBox.Text);

            // Highlight the selected elements in PDF with colored rectangles
            for (int i = 0; i < htmlToPdfConverter.HtmlElementsMappingOptions.HtmlElementsMappingResult.Count; i++)
            {
                HtmlElementMapping htmlElementInfo = htmlToPdfConverter.HtmlElementsMappingOptions.HtmlElementsMappingResult.GetByIndex(i);
                // 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 (PdfRectangle htmlElementLocationInPdf in htmlElementInfo.PdfRectangles)
                {
                    // Get the HTML element location in PDF page
                    PdfPage htmlElementPdfPage = pdfDocument.GetPage(htmlElementLocationInPdf.PageIndex);
                    RectangleFloat 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 = RgbColor.Blue;
                    else if (htmlElementTagName.ToLower() == "h2")
                        highlightRectangle.ForeColor = RgbColor.Green;
                    else if (htmlElementTagName.ToLower() == "h3")
                        highlightRectangle.ForeColor = RgbColor.Red;
                    else if (htmlElementTagName.ToLower() == "h4")
                        highlightRectangle.ForeColor = RgbColor.Yellow;
                    else if (htmlElementTagName.ToLower() == "h5")
                        highlightRectangle.ForeColor = RgbColor.Indigo;
                    else if (htmlElementTagName.ToLower() == "h6")
                        highlightRectangle.ForeColor = RgbColor.Orange;
                    else
                        highlightRectangle.ForeColor = RgbColor.Navy;

                    highlightRectangle.LineStyle.LineDashStyle = LineDashStyle.Solid;

                    htmlElementPdfPage.AddElement(highlightRectangle);
                }
            }

            // Save the PDF document in a memory buffer
            byte[] outPdfBuffer = pdfDocument.Save();

            // Send the PDF as response to browser

            // Set response content type
            Response.AddHeader("Content-Type", "application/pdf");

            // Instruct the browser to open the PDF file as an attachment or inline
            Response.AddHeader("Content-Disposition", String.Format("attachment; filename=Select_in_API_HTML_Elements_to_Retrieve.pdf; size={0}", outPdfBuffer.Length.ToString()));

            // Write the PDF document buffer to HTTP response
            Response.BinaryWrite(outPdfBuffer);

            // End the HTTP response and stop the current page processing
            Response.End();
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                sampleCodeLiteral.Text = System.IO.File.ReadAllText(Server.MapPath("~/DemoAppFiles/Input/Code_Samples/CSharp/AspNet/HTML_to_PDF/HTML_Elements_Location/Select_in_API.html"));
                descriptionLiteral.Text = System.IO.File.ReadAllText(Server.MapPath("~/DemoAppFiles/Input/Descriptions/AspNet/HTML_to_PDF/HTML_Elements_Location/Select_in_API.html"));

                Master.CollapseAll();
                Master.ExpandNode("HTML_to_PDF");
                Master.ExpandNode("HTML_Elements_Location_in_PDF");
                Master.SelectNode("Select_in_API_Elements_to_Retrieve");
            }
        }

        protected void demoMenu_MenuItemClick(object sender, MenuEventArgs e)
        {
            switch (e.Item.Value)
            {
                case "Live_Demo":
                    demoMultiView.SetActiveView(liveDemoView);
                    break;
                case "Description":
                    demoMultiView.SetActiveView(descriptionView);
                    break;
                case "Sample_Code":
                    demoMultiView.SetActiveView(sampleCodeView);
                    break;
                default:
                    break;
            }
        }
    }
}