EVO HTML to PDF Converter allows you to replace in the generated PDF document the original images from HTML document with higher quality images from the local file system. This feature is based on capability of the converter to retrieve the position in the generated PDF document of the image from HTML document as documented in the Select in API the HTML Elements to Retrieve section.
Code Sample - Replace Images from HTML with Higher Quality Images in PDF
protected 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 = "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 all images from HTML page htmlToPdfConverter.HtmlElementsMappingOptions.HtmlElementSelectors = new string[] { "img" }; // Exclude the original images from rendering becuase they will be replaced by an image from local file system htmlToPdfConverter.HiddenHtmlElementsSelectors = new string[] { "img" }; Document pdfDocument = null; try { // Convert a HTML string with images to replace to a PDF document object pdfDocument = htmlToPdfConverter.ConvertUrlToPdfDocumentObject(urlTextBox.Text); // Replace the images selected in HTML using special attributes with images from local file system foreach (HtmlElementMapping imageElementInfo in htmlToPdfConverter.HtmlElementsMappingOptions.HtmlElementsMappingResult) { PdfPage imagePdfPage = imageElementInfo.PdfRectangles[0].PdfPage; RectangleF imageRectangle = imageElementInfo.PdfRectangles[0].Rectangle; ImageElement newImageElement = new ImageElement(imageRectangle.X, imageRectangle.Y, imageRectangle.Width, imageRectangle.Height, Server.MapPath("~/DemoAppFiles/Input/Images/box.jpg")); newImageElement.EnlargeEnabled = true; imagePdfPage.AddElement(newImageElement); } // 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=Replace_with_Higher_Quality_Images.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(); } finally { // Close the PDF document if (pdfDocument != null) pdfDocument.Close(); } }
See Also