The HiQPdf.HtmlToPdf class can be used to quickly create and save a PDF document to a file, to a stream or in a memory buffer but it will convert only one HTML document to a PDF document. Sometimes it is necessary to add multiple HTML documents to the same PDF document and eventualy overlapping the HTML content in multiple layers. This is possible with HiQPdf software using In Place HTML to PDF Object. The HTML objects are added to a PDF document which can be created by one of the methods described in PDF Documents topic.
A very interesting feature producing very special effects is that the content from a HTML document which doesn't have a background color or image will not have a background when converted to PDF. This makes possible to overlap multiple HTML documents in PDF while leaving visible the content underneath them.
In this demo you can see how to layout and overlay multiple HTML objects in the same PDF document. The HTML from URL 1 is laid out at the beginning of the PDF document and the URL 2 is laid out immediately after first HTML or on a new page if 'Layout on New Page' option is on. If the second HTML is laid out on a new page then there is the option to change the orientation of the new pages. The HTML code from the text box is finally overlaid in the first page of the PDF document at the given location.
private void buttonCreatePdf_Click(object sender, EventArgs e) { // create an empty PDF document PdfDocument document = new PdfDocument(); // add a page to document PdfPage page1 = document.AddPage(PdfPageSize.A4, new PdfDocumentMargins(5), PdfPageOrientation.Portrait); Cursor = Cursors.WaitCursor; string pdfFile = Application.StartupPath + @"\DemoOut\LayoutMultipleHtml.pdf"; try { // set the document header and footer before adding any objects to document SetHeader(document); SetFooter(document); // layout the HTML from URL 1 PdfHtml html1 = new PdfHtml(textBoxUrl1.Text); PdfLayoutInfo html1LayoutInfo = page1.Layout(html1); // determine the PDF page where to add URL 2 PdfPage page2 = null; PointF location2 = PointF.Empty; if (checkBoxNewPage.Checked) { // URL 2 is laid out on a new page with the selected orientation page2 = document.AddPage(PdfPageSize.A4, new PdfDocumentMargins(5), GetSelectedPageOrientation()); location2 = PointF.Empty; } else { // URL 2 is laid out immediately after URL 1 and html1LayoutInfo // gives the location where the URL 1 layout finished page2 = document.Pages[html1LayoutInfo.LastPageIndex]; location2 = new PointF(html1LayoutInfo.LastPageRectangle.X, html1LayoutInfo.LastPageRectangle.Bottom); } // layout the HTML from URL 2 PdfHtml html2 = new PdfHtml(location2.X, location2.Y, textBoxUrl2.Text); page2.Layout(html2); document.WriteToFile(pdfFile); } catch (Exception ex) { MessageBox.Show(String.Format("Cannot create the PDF document. {0}", ex.Message)); return; } finally { document.Close(); Cursor = Cursors.Arrow; } // open the created PDF document try { System.Diagnostics.Process.Start(pdfFile); } catch (Exception ex) { MessageBox.Show(String.Format("The PDF document was created but cannot open '{0}'. {1}", pdfFile, ex.Message)); } } private void SetHeader(PdfDocument document) { if (!checkBoxAddHeader.Checked) return; // create the document header document.CreateHeaderCanvas(50); // add PDF objects to the header canvas string headerImageFile = Application.StartupPath + @"\DemoFiles\Images\HiQPdfLogo.png"; PdfImage logoHeaderImage = new PdfImage(5, 5, 40, Image.FromFile(headerImageFile)); document.Header.Layout(logoHeaderImage); // layout HTML in header PdfHtml headerHtml = new PdfHtml(50, 5, @"<span style=""color:Navy; font-family:Times New Roman; font-style:italic""> Quickly Create High Quality PDFs with </span><a href=""http://www.hiqpdf.com"">HiQPdf</a>", null); headerHtml.FitDestHeight = true; headerHtml.FontEmbedding = true; document.Header.Layout(headerHtml); // create a border for header float headerWidth = document.Header.Width; float headerHeight = document.Header.Height; PdfRectangle borderRectangle = new PdfRectangle(1, 1, headerWidth - 2, headerHeight - 2); borderRectangle.LineStyle.LineWidth = 0.5f; borderRectangle.ForeColor = Color.Navy; document.Header.Layout(borderRectangle); } private void SetFooter(PdfDocument document) { if (!checkBoxAddFooter.Checked) return; //create the document footer document.CreateFooterCanvas(50); // layout HTML in footer PdfHtml footerHtml = new PdfHtml(5, 5, @"<span style=""color:Navy; font-family:Times New Roman; font-style:italic""> Quickly Create High Quality PDFs with </span><a href=""http://www.hiqpdf.com"">HiQPdf</a>", null); footerHtml.FitDestHeight = true; footerHtml.FontEmbedding = true; document.Footer.Layout(footerHtml); float footerHeight = document.Footer.Height; float footerWidth = document.Footer.Width; // add page numbering Font pageNumberingFont = new Font(new FontFamily("Times New Roman"), 8, GraphicsUnit.Point); //pageNumberingFont.Mea PdfText pageNumberingText = new PdfText(5, footerHeight - 12, "Page {CrtPage} of {PageCount}", pageNumberingFont); pageNumberingText.HorizontalAlign = PdfTextHAlign.Center; pageNumberingText.EmbedSystemFont = true; pageNumberingText.ForeColor = Color.DarkGreen; document.Footer.Layout(pageNumberingText); string footerImageFile = Application.StartupPath + @"\DemoFiles\Images\HiQPdfLogo.png"; PdfImage logoFooterImage = new PdfImage(footerWidth - 40 - 5, 5, 40, Image.FromFile(footerImageFile)); document.Footer.Layout(logoFooterImage); // create a border for footer PdfRectangle borderRectangle = new PdfRectangle(1, 1, footerWidth - 2, footerHeight - 2); borderRectangle.LineStyle.LineWidth = 0.5f; borderRectangle.ForeColor = Color.DarkGreen; document.Footer.Layout(borderRectangle); }