// Copyright (C) 2003-2026, Foxit Software Inc..
// All Rights Reserved.
//
// http://www.foxitsoftware.com
//
// The following code is copyrighted and contains proprietary information and trade secrets of Foxit Software Inc..
// You cannot distribute any part of Foxit PDF SDK to any third party or general public,
// unless there is a separate license agreement with Foxit Software Inc. which explicitly grants you such rights.
//
// This file contains an example to demonstrate how to use Foxit PDF SDK to extract attached files from PDF files and
// add files as attachments to PDF files.

using System;
using System.Text;
using System.IO;

using foxit;
using foxit.common;
using foxit.common.fxcrt;
using foxit.pdf;
using foxit.pdf.objects;

namespace attachmentCS
{
    class TextDoc 
    {
        private FileStream mfile_stream;
        public TextDoc(string file_name, FileMode fill_mode)
        {
            mfile_stream = new FileStream(file_name, fill_mode);
        }
        ~TextDoc()
        {
            try
            {
                mfile_stream.Flush();
                mfile_stream.Close();
            }
            catch (System.ObjectDisposedException e)
            {
                string str = e.Message;
            }
            
        }
        public void Write(string contents)
        {
            byte[] byte_data = Encoding.Default.GetBytes(contents);
            // Move file pointer to the end of file.
            mfile_stream.Seek(0, SeekOrigin.End);
            mfile_stream.Write(byte_data, 0, byte_data.Length);
            mfile_stream.Flush();
        }
        public string Read()
        {
            int fs_len = (int)mfile_stream.Length;
            byte[] byte_data = new byte[fs_len];
            int r = mfile_stream.Read(byte_data, 0, byte_data.Length);
            string contents = System.Text.Encoding.UTF8.GetString(byte_data);
            return contents;
        }
    };

    class attachment
    {
        public static string DateTimeToString(foxit.common.DateTime datetime)
        {
            String s_datetime = string.Format("{0}/{1}/{2}-{3}:{4}:{5} {6}{7}:{8}", datetime.year, datetime.month, datetime.day, 
                datetime.hour,datetime.minute, datetime.second, datetime.utc_hour_offset > 0 ? "+" : "-", 
                datetime.utc_hour_offset,
                datetime.utc_minute_offset);
            return s_datetime;
        }

        static void Main(string[] args)
        {
            string sn = "Rew1vB0TqoMIxX444UcpScARWdhgJpsJfzmyMLR32a0+EgrCjp2NaQ==";
            string key = "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";
            // Initialize library.
            ErrorCode error_code = Library.Initialize(sn, key);
            if (error_code != ErrorCode.e_ErrSuccess)
                Console.WriteLine("Library Initialize Error: {0}\n", error_code);

            string output_path = "../output_files/attachment/";
            System.IO.Directory.CreateDirectory(output_path);

            string file_info = output_path + "attachMent_info.txt";
            string input_path = "../input_files/";
            string input_file = input_path + "attachment.pdf";

            try
            {
                using (PDFDoc doc = new PDFDoc(input_file))
                {
                    error_code = doc.Load(null);
                    if (error_code != ErrorCode.e_ErrSuccess)
                    {
                        Console.WriteLine("The PDFDoc {0} Error: {1}\n", input_file, error_code);
                        Library.Release();
                        return;
                    }

                    // Get information of attachments.
                    using (Attachments attachments = new Attachments(doc, new PDFNameTree()))
                    {
                        TextDoc text_doc = new TextDoc(file_info, FileMode.Create);
                        int count = attachments.GetCount();
                        for (int i = 0; i < count; i++)
                        {
                            string _key = attachments.GetKey(i);
                            text_doc.Write(string.Format("key:\t\t{0}\r\n", _key));
                            using (FileSpec file_spec = attachments.GetEmbeddedFile(_key))
                            {
                                if (!file_spec.IsEmpty())
                                {
                                    string name = file_spec.GetFileName();
                                    text_doc.Write(string.Format("Name:\t\t{0}\r\n", name));
                                    text_doc.Write(string.Format("Size:\t\t{0}\r\n", file_spec.GetFileSize()));
                                    text_doc.Write(string.Format("Is embedded:\t{0}\r\n", file_spec.IsEmbedded() ? "true" : "false"));
                                    text_doc.Write(string.Format("Creation time:\t{0}\r\n", DateTimeToString(file_spec.GetCreationDateTime())));
                                    text_doc.Write(string.Format("Modified time:\t{0}\r\n", DateTimeToString(file_spec.GetModifiedDateTime())));
                                    text_doc.Write("\r\n");
                                    if (file_spec.IsEmbedded())
                                    {
                                        String exFilePath = output_path + name;
                                        bool bExportStatus = file_spec.ExportToFile(exFilePath);
                                        Console.WriteLine(name + " ExportToFile " + (bExportStatus ? "Success" : "Failed"));
                                    }
                                }
                            }
                        }
                        // Remove all attachments
                        using (Attachments attachment = new Attachments(doc, new PDFNameTree()))
                        {
                            attachment.RemoveAllEmbeddedFiles();
                            string new_pdf = output_path + "attachment_remove.pdf";
                            doc.SaveAs(new_pdf, (int)PDFDoc.SaveFlags.e_SaveFlagNoOriginal);
                            Console.WriteLine("Remove all attachments.");
                        }

                        // Add a new attachment to PDF document.
                        string text_path = input_path + "AboutFoxit.pdf";
                        using (Attachments attachment = new Attachments(doc, new PDFNameTree()))
                        {
                            attachment.AddFromFilePath("OriginalAttachmentsInfo", text_path);
                            string new_pdf = output_path + "attachment_add.pdf";
                            doc.SaveAs(new_pdf, (int)PDFDoc.SaveFlags.e_SaveFlagNoOriginal);
                            Console.WriteLine("Add a new attachment to PDF document.");
                        }
                    }
                }
            }
            catch(foxit.PDFException e)
            {
                Console.WriteLine(e.Message);
            }
            Library.Release();
        }
    }
}
