SDF

1//
2// Copyright (c) 2001-2021 by PDFTron Systems Inc. All Rights Reserved.
3//
4
5using System;
6using pdftron;
7using pdftron.Common;
8using pdftron.Filters;
9using pdftron.SDF;
10using pdftron.PDF;
11
12using NUnit.Framework;
13
14namespace MiscellaneousSamples
15{
16	/// <summary>
17	/// This sample illustrates how to use basic SDF API (also known as Cos) to edit an 
18	/// existing document.
19	/// </summary>
20	[TestFixture]
21	public class SDFTest
22	{
23		
24		[Test]
25		public static void Sample()
26		{
27
28			// Relative path to the folder containing test files.
29			const string input_path =  "TestFiles/";
30
31
32			//------------------------------------------------------------------
33			Console.WriteLine("Opening the test file...");
34
35			try
36			{
37				// Here we create a SDF/Cos document directly from PDF file. In case you have 
38				// PDFDoc you can always access SDF/Cos document using PDFDoc.GetSDFDoc() method.
39				using (SDFDoc doc = new SDFDoc(Utils.GetAssetTempFile(input_path + "fish.pdf")))
40				{
41					doc.InitSecurityHandler();				
42                    
43					Console.WriteLine("Modifying info dictionary, adding custom properties, embedding a stream...");
44
45					Obj trailer = doc.GetTrailer();	// Get the trailer
46
47					// Now we will change PDF document information properties using SDF API
48
49					// Get the Info dictionary. 
50					DictIterator itr = trailer.Find("Info");	
51					Obj info;
52					if (itr.HasNext()) 
53					{
54						info = itr.Value();
55						// Modify 'Producer' entry.
56						info.PutString("Producer", "PDFTron PDFNet");
57
58						// Read title entry (if it is present)
59						itr = info.Find("Author"); 
60						if (itr.HasNext()) 
61						{
62							info.PutString("Author", itr.Value().GetAsPDFText() + "- Modified");
63						}
64						else 
65						{
66							info.PutString("Author", "Joe Doe");
67						}
68					}
69					else 
70					{
71						// Info dict is missing. 
72						info = trailer.PutDict("Info");
73						info.PutString("Producer", "PDFTron PDFNet");
74						info.PutString("Title", "My document");
75					}
76
77					// Create a custom inline dictionary within Info dictionary
78					Obj custom_dict = info.PutDict("My Direct Dict");
79
80					// Add some key/value pairs
81					custom_dict.PutNumber("My Number", 100);
82
83					Obj my_array = custom_dict.PutArray("My Array");
84
85					// Create a custom indirect array within Info dictionary
86					Obj custom_array = doc.CreateIndirectArray();	
87					info.Put("My Indirect Array", custom_array);
88					
89					// Create indirect link to root
90					custom_array.PushBack(trailer.Get("Root").Value());
91
92					// Embed a custom stream (file my_stream.txt).
93					MappedFile embed_file = new MappedFile(Utils.GetAssetTempFile(input_path + "my_stream.txt"));
94					FilterReader mystm = new FilterReader(embed_file);
95					custom_array.PushBack(doc.CreateIndirectStream(mystm));
96
97					// Save the changes.
98					Console.WriteLine("Saving modified test file...");
99					doc.Save(Utils.CreateExternalFile("sdftest_out.pdf"), 0, "%PDF-1.4");
100				}
101
102				Console.WriteLine("Test completed.");
103			}
104			catch (PDFNetException e)
105			{
106				Console.WriteLine(e.Message);
107				Assert.True(false);
108			}
109		}
110	}
111}