在iTextSharp中设置元数据

Question

我正在开发一个应用程序,我使用iTextSharp库.

我也在阅读曼宁的iText,所以我可以获得参考.

在第12章中,它具有以下代码来更改Java中的元数据.

PdfReader reader = new PdfReader(src);
PdfStamper stamper =
new PdfStamper(reader, new FileOutputStream(dest));
HashMap<String, String> info = reader.getInfo();
info.put("Title", "Hello World stamped");
info.put("Subject", "Hello World with changed metadata");
info.put("Keywords", "iText in Action, PdfStamper");
info.put("Creator", "Silly standalone example");
info.put("Author", "Also Bruno Lowagie");
stamper.setMoreInfo(info);
stamper.close();

我怎样才能在C#中做同样的事情？

Answer 1

从Java到C#的转换通常非常简单.按照惯例,Java属性使用get和set前缀,因此要转换为C#,您只需要删除前缀并将其转换为.Net getter/setter调用.getInfo()变Info和setMoreInfo(info)变MoreInfo = info.然后,您只需将本机Java类型转换为其等效的C#类型.在这种情况下,Java FileOutputStream变成.Net FileStream而HashMap<String, String>变成了Dictionary<String, String>.

最后,我更新了代码,以反映现在(从5.1.1.0开始)实现的iTextSharp的最新更改IDisposable.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Forms;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            string workingFolder = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
            string inputFile = Path.Combine(workingFolder, "Input.pdf");
            string outputFile = Path.Combine(workingFolder, "Output.pdf");

            PdfReader reader = new PdfReader(inputFile);
            using(FileStream fs = new FileStream(outputFile, FileMode.Create, FileAccess.Write, FileShare.None)){
                using (PdfStamper stamper = new PdfStamper(reader, fs))
                {
                    Dictionary<String, String> info = reader.Info;
                    info.Add("Title", "Hello World stamped");
                    info.Add("Subject", "Hello World with changed metadata");
                    info.Add("Keywords", "iText in Action, PdfStamper");
                    info.Add("Creator", "Silly standalone example");
                    info.Add("Author", "Also Bruno Lowagie");
                    stamper.MoreInfo = info;
                    stamper.Close();
                }
            }

            this.Close();
        }
    }
}

Answer 2

我只是在PdfWriter对象的监视窗口中搜索正确的位置后创建了这个,它更改了PDF中的"PDF Creator",因为默认情况下无法访问它:

private static void ReplacePDFCreator(PdfWriter writer)
    {
        Type writerType = writer.GetType();
        PropertyInfo writerProperty = writerType.GetProperties(BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance).Where(p => p.PropertyType == typeof(PdfDocument)).FirstOrDefault();

        PdfDocument pd =  (PdfDocument)writerProperty.GetValue(writer);
        Type pdType = pd.GetType();
        FieldInfo infoProperty = pdType.GetFields(BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.Instance).Where(p => p.Name == "info").FirstOrDefault();
        PdfDocument.PdfInfo pdfInfo = (PdfDocument.PdfInfo)infoProperty.GetValue(pd);

        PdfString str = new PdfString("YOUR NEW PDF CREATOR HERE");
        pdfInfo.Remove(new PdfName("Producer"));
        pdfInfo.Put(new PdfName("Producer"), str);
    }

我从"@ yannic-donot-text"得到了一个建议,它更干净了!:

private static void ReplacePDFCreator(PdfWriter writer)
    {
       writer.Info.Put(new PdfName("Producer"), new PdfString("YOUR NEW PDF CREATOR HERE"));
    }

我认为它只能通过反思来实现,但我很欣赏受过更多教育的人的合作:)

谢谢!