SDF

1//
2// Copyright (c) 2001-2020 by PDFTron Systems Inc. All Rights Reserved.
3//
4
5using System;
6using System.IO;
7using System.Threading.Tasks;
8using Windows.Foundation;
9
10using pdftron.Filters;
11using pdftron.SDF;
12
13using PDFNetUniversalSamples.ViewModels;
14
15namespace PDFNetSamples
16{
17    public sealed class SDFTest : Sample
18    {
19        public SDFTest() :
20            base("SDF", "The sample illustrates how to use basic Cos/SDF API to edit an existing document.")
21        {
22        }
23
24        public override IAsyncAction RunAsync()
25        {
26            return Task.Run(new System.Action(async () => {
27                WriteLine("--------------------------------");
28                WriteLine("Starting SDF Test...");
29                WriteLine("--------------------------------\n");
30            
31                string input_file_path = Path.Combine(InputPath, "fish.pdf");
32                WriteLine("Opening input file " + input_file_path);
33
34			    try
35			    {
36				    // Here we create a SDF/Cos document directly from PDF file. In case you have 
37				    // PDFDoc you can always access SDF/Cos document using PDFDoc.GetSDFDoc() method.
38				    SDFDoc doc = new SDFDoc(input_file_path);
39				    doc.InitSecurityHandler();				
40
41				    WriteLine("-------------------------------------------------");
42                    WriteLine("Modifying info dictionary, adding custom properties, embedding a stream...");
43
44				    Obj trailer = doc.GetTrailer();	// Get the trailer
45
46				    // Now we will change PDF document information properties using SDF API
47
48				    // Get the Info dictionary. 
49				    DictIterator itr = trailer.Find("Info");	
50				    Obj info;
51				    if (itr.HasNext()) 
52				    {
53					    info = itr.Value();
54					    // Modify 'Producer' entry.
55					    info.PutString("Producer", "PDFTron PDFNet");
56
57					    // Read title entry (if it is present)
58					    itr = info.Find("Author"); 
59					    if (itr.HasNext()) 
60					    {
61						    info.PutString("Author", itr.Value().GetAsPDFText() + "- Modified");
62					    }
63					    else 
64					    {
65						    info.PutString("Author", "Joe Doe");
66					    }
67				    }
68				    else 
69				    {
70					    // Info dict is missing. 
71					    info = trailer.PutDict("Info");
72					    info.PutString("Producer", "PDFTron PDFNet");
73					    info.PutString("Title", "My document");
74				    }
75
76				    // Create a custom inline dictionary within Info dictionary
77				    Obj custom_dict = info.PutDict("My Direct Dict");
78
79				    // Add some key/value pairs
80				    custom_dict.PutNumber("My Number", 100);
81
82				    Obj my_array = custom_dict.PutArray("My Array");
83
84				    // Create a custom indirect array within Info dictionary
85				    Obj custom_array = doc.CreateIndirectArray();	
86				    info.Put("My Indirect Array", custom_array);
87				
88				    // Create indirect link to root
89				    custom_array.PushBack(trailer.Get("Root").Value());
90
91				    // Embed a custom stream (file my_stream.txt).
92                    MappedFile embed_file = new MappedFile(Path.Combine(InputPath, "my_stream.txt"));
93				    FilterReader mystm = new FilterReader(embed_file);
94                    custom_array.PushBack(doc.CreateIndirectStream(mystm));
95
96				    // Save the changes.
97                    String output_file_path = Path.Combine(OutputPath, "sdftest_out.pdf");
98                    await doc.SaveAsync(output_file_path, 0, "%PDF-1.4");
99				    doc.Destroy();
100				    WriteLine("Test completed.");
101                    WriteLine("Done. Results saved in " + output_file_path);
102                    await AddFileToOutputList(output_file_path).ConfigureAwait(false);
103			    }
104			    catch (Exception e) {
105                    WriteLine(GetExceptionMessage(e));
106                }
107
108                WriteLine("\n--------------------------------");
109                WriteLine("Done SDF Test.");
110                WriteLine("--------------------------------\n");
111            })).AsAsyncAction();
112		}
113	}
114}