Pdf书签和链接的问题 [英] Problem With Pdf Bookmarks and Links

问题描述

如何在asp.net中获取PDF文档中的书签和链接..？

How to get Bookmarks and Links in a PDF Document in asp.net..?

推荐答案

嗨朋友这是获取书签和链接的解决方案来自pdf 使用 itextsharp.dll

Hi Friend this is solution for getting bookmarks and links from pdf using itextsharp.dll

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Text;
using iTextSharp.text.pdf;
using iTextSharp.text.pdf.parser;
using System.Data;
using System.Collections;

public partial class _Default : System.Web.UI.Page
{
    DataTable bookmarksTable = new DataTable();

    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {

        if (FileUpload1.HasFile)
        {
            string filename = FileUpload1.FileName;
            //Save file temporary in server path 
            FileUpload1.SaveAs(Server.MapPath(filename));
            //pass that method in sepearte pdf content read method
            ReadPDFContent(Server.MapPath(filename));
        }
    }

    private static List<string> GetPdfLinks(string file, int page)
    {
        //Open our reader
        PdfReader pdfData = new PdfReader(file);
        //Get the current page
        PdfDictionary PageDictionary = pdfData.GetPageN(page);
        //Get all of the annotations for the current page
        PdfArray Annots = PageDictionary.GetAsArray(PdfName.ANNOTS);
        //Make sure we have something
        if ((Annots == null) || (Annots.Length == 0))
            return null;
        List<string> Ret = new List<string>();
        //Loop through each annotation
        foreach (PdfObject annotation in Annots.ArrayList)
        {
            //Convert the itext-specific object as a generic PDF object
            PdfDictionary AnnotationDictionary = (PdfDictionary)PdfReader.GetPdfObject(annotation);
            //Make sure this annotation has a link
            if (!AnnotationDictionary.Get(PdfName.SUBTYPE).Equals(PdfName.LINK))
                continue;
            //Make sure this annotation has an ACTION
            if (AnnotationDictionary.Get(PdfName.A) == null)
                continue;
            //Get the ACTION for the current annotation
            PdfDictionary AnnotationAction = (PdfDictionary)AnnotationDictionary.Get(PdfName.A);
            //Test if it is a URI action (There are tons of other types of actions, some of which might mimic URI, such as JavaScript, but those need to be handled seperately)
            if (AnnotationAction.Get(PdfName.S).Equals(PdfName.URI))
            {
                PdfString Destination = AnnotationAction.GetAsString(PdfName.URI);
                if (Destination != null)
                    Ret.Add(Destination.ToString());
            }
        }
        return Ret;
    }


    protected DataTable TakeBookMarksFromList(PdfReader pdfFileReader, Dictionary<string, object> bookmarks)
    {
        string title = null, section = null;
        DataRow bookmarkRow = bookmarksTable.NewRow();
        foreach (KeyValuePair<string, object> dictionaryValue in bookmarks)
        {
            if (dictionaryValue.Key == "Named" || dictionaryValue.Key == "Page")
            {
                section = dictionaryValue.Value.ToString();
                bookmarkRow["Section"] = section;
                if (dictionaryValue.Key == "Page")
                {
                    bookmarkRow["Destination"] = section.Substring(0, section.IndexOf(" "));
                }
                else
                {
                    Dictionary<string, string> pages = SimpleNamedDestination.GetNamedDestination(pdfFileReader, false);
                    foreach (KeyValuePair<string, string> destPage in pages)
                    {
                        if (destPage.Key.StartsWith(section))
                        {
                            bookmarkRow["Destination"] = destPage.Value.Substring(0, destPage.Value.IndexOf(" "));
                        }
                    }
                }
            }
            if (dictionaryValue.Key == "Title")
            {
                title = dictionaryValue.Value.ToString();
                bookmarkRow["Title"] = title;
                bookmarksTable.Rows.Add(bookmarkRow);
            }
            if (dictionaryValue.Key == "Kids")
            {
                IList<Dictionary<string, object>> innerDictionary = (IList<Dictionary<string, object>>)dictionaryValue.Value;
                foreach (Dictionary<string, object> innerKids in innerDictionary)
                {
                    if (innerKids.Count > 3)
                    {
                        TakeBookMarksFromList(pdfFileReader, innerKids);
                    }
                    else
                    {
                        bookmarkRow = bookmarksTable.NewRow();
                        foreach (KeyValuePair<string, object> childPair in innerKids)
                        {
                            if (childPair.Key == "Named" || childPair.Key == "Page")
                            {
                                section = childPair.Value.ToString();
                                bookmarkRow["Section"] = section;
                                if (childPair.Key == "Page")
                                {
                                    bookmarkRow["Destination"] = section.Substring(0, section.IndexOf(" "));
                                }
                                else
                                {
                                    Dictionary<string, string> pages = SimpleNamedDestination.GetNamedDestination(pdfFileReader, false);
                                    foreach (KeyValuePair<string, string> destPage in pages)
                                    {
                                        if (destPage.Key.StartsWith(section))
                                        {
                                            bookmarkRow["Destination"] = destPage.Value.Substring(0, destPage.Value.IndexOf(" "));
                                        }

                                    }
                                }
                            }
                            if (childPair.Key == "Title")
                            {
                                title = childPair.Value.ToString();
                                bookmarkRow["Title"] = title;
                                bookmarksTable.Rows.Add(bookmarkRow);
                            }
                        }
                    }
                }
            }
        }

        return bookmarksTable;
    }


    void ReadPDFContent(string path)
    {
        bookmarksTable.Columns.Add("Section", typeof(string));
        bookmarksTable.Columns.Add("Title", typeof(string));
        bookmarksTable.Columns.Add("Destination", typeof(string));

        if (File.Exists(path))
        {
            PdfReader pdfFileReader = new PdfReader(path);
            IList<Dictionary<string, object>> bookmarks = SimpleBookmark.GetBookmark(pdfFileReader);
            if (bookmarks != null)
            {
                foreach (Dictionary<string, object> item in bookmarks)
                {
                    bookmarksTable = TakeBookMarksFromList(pdfFileReader, item);
                }
            }
            #region Links in Pdf File

            DataTable linksTable = new DataTable();
            linksTable.Columns.Add("Link Text", typeof(string));
            linksTable.Columns.Add("PageNumber", typeof(int));

            for (int pageNum = 1; pageNum <= pdfFileReader.NumberOfPages; pageNum++)
            {
                List<string> Links = GetPdfLinks(path, pageNum);
                if (Links != null)
                {
                    if (Links.Count > 0)
                    {
                        for (int i = 0; i < Links.Count; i++)
                        {
                            DataRow linkRow = linksTable.NewRow();
                            linkRow["Link Text"] = Links[i].ToString();
                            linkRow["PageNumber"] = pageNum;
                            linksTable.Rows.Add(linkRow);
                        }
                    }
                }
            }
            #endregion Links in Pdf File

            if (linksTable.Rows.Count == 0)
            {
                DataRow linkRow = linksTable.NewRow();
                linksTable.Rows.Add(linkRow);
                gridLinks.DataSource = linksTable;
                gridLinks.DataBind();
                int gridLinksColCount = gridLinks.Rows[0].Cells.Count;
                gridLinks.Rows[0].Cells.Clear();
                gridLinks.Rows[0].Cells.Add(new TableCell());
                gridLinks.Rows[0].Cells[0].ColumnSpan = gridLinksColCount;
                gridLinks.Rows[0].Cells[0].Text = "No Links Found in Document";
            }
            else
            {
                gridLinks.DataSource = linksTable;
                gridLinks.DataBind();
            }
            if (bookmarksTable.Rows.Count == 0)
            {
                DataRow bookmarkRow = bookmarksTable.NewRow();
                bookmarksTable.Rows.Add(bookmarkRow);
                gridBookmarks.DataSource = bookmarksTable;
                gridBookmarks.DataBind();
                int columncount = gridBookmarks.Rows[0].Cells.Count;
                gridBookmarks.Rows[0].Cells.Clear();
                gridBookmarks.Rows[0].Cells.Add(new TableCell());
                gridBookmarks.Rows[0].Cells[0].ColumnSpan = columncount;
                gridBookmarks.Rows[0].Cells[0].Text = "No Bookmarks Found in Document";
            }
            else
            {
                gridBookmarks.DataSource = bookmarksTable;
                gridBookmarks.DataBind();
            }
        }
    }
}

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