// // This code is part of Document Solutions for PDF demos. // Copyright (c) MESCIUS inc. All rights reserved. // using System; using System.IO; using System.Drawing; using GrapeCity.Documents.Pdf; using GrapeCity.Documents.Text; using GCTEXT = GrapeCity.Documents.Text; using GCDRAW = GrapeCity.Documents.Drawing; namespace DsPdfWeb.Demos.Basics { // Shows how to create a large document using less memory. // // DsPdf provides two approaches to creating a PDF file: // - The usually more convenient approach: you build the document completely first, // adding text, graphics and other elements. Then you call Save() on the document // passing the name of the file, or the stream to save to. This approach allows // to modify the already created content - e.g. you can insert pages anywhere // in the document, or modify the already added pages. // - The StartDoc/EndDoc method: with this approach, you provide the stream // to save to at the very beginning, before adding any content to the document, // by calling the StartDoc() method on the document. All content is then written // directly to that stream, and you cannot go back and update the already created pages. // To complete the document you call the EndDoc() method. If you try to perform an // action that is not allowed, an exception will be thrown. While this approach is // somewhat limiting (e.g. Linearized cannot be set to true in this mode), it uses // less memory and may be preferable especially when creating very large documents. // // This sample demonstrates the StartDoc/EndDoc approach. // // Essentially the same code, but without using StartDoc/EndDoc, is demonstrated by the // LargeDocument2 sample. See also LinearizedPdf. public class StartEndDoc { public int CreatePDF(Stream stream) { // Number of pages to generate: const int N = Common.Util.LargeDocumentIterations; var doc = new GcPdfDocument(); // Start creating the document by this call: doc.StartDoc(stream); // Prep a TextLayout to hold/format the text: var tl = new TextLayout(72) { MaxWidth = doc.PageSize.Width, MaxHeight = doc.PageSize.Height, MarginAll = 72, }; tl.DefaultFormat.Font = StandardFonts.Times; tl.DefaultFormat.FontSize = 12; // Start with a title page: tl.FirstLineIndent = 0; var fnt = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "NotoSerif-Regular.ttf")); var tf0 = new TextFormat() { FontSize = 24, FontBold = true, Font = fnt }; tl.Append(string.Format("Large Document\n{0} Pages of Lorem Ipsum\n\n", N), tf0); var tf1 = new TextFormat(tf0) { FontSize = 14, FontItalic = true }; tl.Append(string.Format("Generated on {0}.", Common.Util.TimeNow().ToString("R")), tf1); tl.TextAlignment = TextAlignment.Center; tl.PerformLayout(true); doc.Pages.Add().Graphics.DrawTextLayout(tl, PointF.Empty); tl.Clear(); tl.FirstLineIndent = 36; tl.TextAlignment = TextAlignment.Leading; // Generate the document: for (int pageIdx = 0; pageIdx < N; ++pageIdx) { tl.Append(Common.Util.LoremIpsum(1)); tl.PerformLayout(true); doc.NewPage().Graphics.DrawTextLayout(tl, PointF.Empty); tl.Clear(); } // NOTE: Certain operations (e.g. the one below) will throw an error when using StartDoc/EndDoc: // doc.Pages.Insert(0); // // Done - call EndDoc instead of Save(): doc.EndDoc(); return doc.Pages.Count; } } }