// // 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 System.Numerics; using System.Collections.Generic; using System.Linq; using GrapeCity.Documents.Text; using GrapeCity.Documents.Drawing; using GrapeCity.Documents.Pdf; using GrapeCity.Documents.Pdf.Annotations; using GrapeCity.Documents.Pdf.Graphics; using GCTEXT = GrapeCity.Documents.Text; using GCDRAW = GrapeCity.Documents.Drawing; namespace DsPdfWeb.Demos { // This sample demonstrates how to extract text from an existing PDF. // It loads an arbitrary PDF into a temporary GcPdfDocument, then // retrieves text from each page of that document using the Page.GetText() method, // adds all those texts to a TextLayout and renders it into the current document. // An alternative to Page.GetText() is the method GcPdfDocument.GetText() // which retrieves the text from the whole document at once. public class ExtractText { public int CreatePDF(Stream stream) { var doc = new GcPdfDocument(); var page = doc.NewPage(); var rc = Common.Util.AddNote( "This sample loads an arbitrary PDF into a temporary GcPdfDocument, " + "then retrieves text from each page of the loaded document using the Page.GetText() method, " + "adds all those texts to a TextLayout and renders it into the current document. " + "An alternative to Page.GetText() is the method GcPdfDocument.GetText() " + "which retrieves the text from the whole document at once.", page); // Text format for captions: var tf = new TextFormat() { Font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "NotoSerif-Regular.ttf")), FontSize = 14, ForeColor = Color.Blue }; // Text layout to render the text: var tl = new TextLayout(72); tl.DefaultFormat.Font = StandardFonts.Times; tl.DefaultFormat.FontSize = 12; tl.MaxWidth = doc.PageSize.Width; tl.MaxHeight = doc.PageSize.Height; tl.MarginAll = rc.Left; tl.MarginTop = rc.Bottom + 36; // Text split options for widow/orphan control: var to = new TextSplitOptions(tl) { MinLinesInFirstParagraph = 2, MinLinesInLastParagraph = 2, RestMarginTop = rc.Left, }; // Open an arbitrary PDF, load it into a temp document and get all page texts: using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "Wetlands.pdf")); var doc1 = new GcPdfDocument(); doc1.Load(fs); // Get the texts of the loaded document's pages: var texts = new List<string>(); doc1.Pages.ToList().ForEach(p_ => texts.Add(p_.GetText())); // Add texts and captions to the text layout: for (int i = 0; i < texts.Count; ++i) { tl.AppendLine(string.Format("Text from page {0} of the loaded document:", i + 1), tf); tl.AppendLine(texts[i]); } tl.PerformLayout(true); while (true) { // 'rest' will accept the text that did not fit: var splitResult = tl.Split(to, out TextLayout rest); doc.Pages.Last.Graphics.DrawTextLayout(tl, PointF.Empty); if (splitResult != SplitResult.Split) break; tl = rest; doc.NewPage(); } // Done: doc.Save(stream); return doc.Pages.Count; } } }