//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.IO;using System.Drawing;using System.Collections.Generic;using GrapeCity.Documents.Pdf;
namespace DsPdfWeb.Demos.Basics{    // This sample shows how to save pages of an existing PDF as images.    // It loads a PDF generated by the SlidePages sample, then saves    // the whole PDF as a multi-page TIFF. It also saves each of the pages    // as a separate JPEG image. Finally, the last page of the loaded PDF    // is saved as SVGZ (compressed SVG).    // All generated images are attached to the resulting PDF.    //     // Other image formats that are also supported: PNG, BMP, GIF.    public class SaveAsImage    {        public int CreatePDF(Stream stream)        {            var doc = new GcPdfDocument();            var page = doc.NewPage();
            Common.Util.AddNote(                "We load the PDF generated by the 'Slide Pages' sample, " +                "and save the whole PDF as a multi-page TIFF. " +                "We also save each of the pages as a separate JPEG image. " +                "Finally, the last page is saved as SVGZ (compressed SVG). " +                "All created images are then attached to this document.",                page);
            // Keep track of temp files, delete them on exit:            var tfiles = new List<string>();
            using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "SlidePages.pdf"));            var docSrc = new GcPdfDocument();            docSrc.Load(fs);            // Save all pages of the loaded PDF as a multi-page TIFF:            var tf = Path.GetTempFileName();            docSrc.SaveAsTiff(tf);            var fspec = FileSpecification.FromEmbeddedFile(EmbeddedFileStream.FromFile(doc, tf));            fspec.File.FileName = "SlidePages.tiff";            doc.EmbeddedFiles.Add(fspec.File.FileName, fspec);            tfiles.Add(tf);
            // Save each page of the loaded PDF as a JPEG:            foreach (var p in docSrc.Pages)            {                tf = Path.GetTempFileName();                p.SaveAsJpeg(tf);                fspec = FileSpecification.FromEmbeddedFile(EmbeddedFileStream.FromFile(doc, tf));                fspec.File.FileName = $"Page_{p.Index}.jpeg";                doc.EmbeddedFiles.Add(fspec.File.FileName, fspec);                tfiles.Add(tf);            }
            // Finally, save the last page of the PDF as SVGZ (compressed SVG):            var bytes = docSrc.Pages.Last.ToSvgz(new SaveAsImageOptions() { BackColor = Color.Transparent });            fspec = FileSpecification.FromEmbeddedFile(EmbeddedFileStream.FromBytes(doc, bytes));            fspec.File.FileName = $"Page_{docSrc.Pages.Last.Index}.svgz";            doc.EmbeddedFiles.Add(fspec.File.FileName, fspec);
            doc.Save(stream);            // Clean up:            tfiles.ForEach(tf_ => File.Delete(tf_));            // Done:            return doc.Pages.Count;        }    }}