-
Notifications
You must be signed in to change notification settings - Fork 0
/
PdfMerger.cs
116 lines (97 loc) · 4.02 KB
/
PdfMerger.cs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using iTextSharp.text;
using iTextSharp.text.pdf;
using CommandLine;
namespace PdfMerger
{
public class PdfMerger
{
public static int Main(string[] args)
{
var pdfMergerOptions = new PdfMergerOptions();
if (!Parser.Default.ParseArguments(args, pdfMergerOptions))
{
Console.WriteLine(pdfMergerOptions.GetUsage());
return -1;
}
var program = new PdfMerger();
program.GetFilesAndMerge(pdfMergerOptions.Directory, pdfMergerOptions.Directory);
return 0;
}
public void GetFilesAndMerge(string sourceDirectory, string targetDirectory)
{
try
{
var fileContents = new List<byte[]>();
var files = Directory.GetFiles(sourceDirectory, "*.pdf").ToList();
files.Sort();
foreach (var file in files)
{
using (var fileStream = new FileStream(file, FileMode.Open, FileAccess.Read))
{
var bytes = new byte[fileStream.Length];
fileStream.Read(bytes, 0, (int) fileStream.Length);
fileContents.Add(bytes);
}
}
var pdfMerger = new PdfMerger();
var mergedPdf = pdfMerger.MergeFiles(fileContents);
var mergedFilePath = Path.Combine(targetDirectory,
string.Format("merged_{0}.pdf", DateTime.Now.ToFileTime()));
Console.WriteLine("Merged file will be written to here: {0}", mergedFilePath);
using (var file = new FileStream(mergedFilePath, FileMode.Create, FileAccess.Write))
{
file.Write(mergedPdf, 0, mergedPdf.Length);
file.Flush();
file.Close();
}
}
catch (Exception err)
{
Console.WriteLine("Error caught while merging PDF files. Message from exception was {0}", err.Message);
throw;
}
}
public byte[] MergeFiles(List<byte[]> sourceFiles)
{
var document = new Document();
var output = new MemoryStream();
// Initialize pdf writer
var writer = PdfWriter.GetInstance(document, output);
writer.PageEvent = new PdfPageEvents();
// Open document to write
document.Open();
var content = writer.DirectContent;
// Iterate through all pdf documents
foreach (byte[] sourceFile in sourceFiles)
{
var reader = new PdfReader(sourceFile);
var numberOfPages = reader.NumberOfPages;
// Iterate through all pages
for (var currentPageIndex = 1; currentPageIndex <= numberOfPages; currentPageIndex++)
{
// Determine page size for the current page
document.SetPageSize(reader.GetPageSizeWithRotation(currentPageIndex));
// Create page
document.NewPage();
var importedPage = writer.GetImportedPage(reader, currentPageIndex);
// Determine page orientation
var pageOrientation = reader.GetPageRotation(currentPageIndex);
if ((pageOrientation == 90) || (pageOrientation == 270))
{
content.AddTemplate(importedPage, 0, -1f, 1f, 0, 0, reader.GetPageSizeWithRotation(currentPageIndex).Height);
}
else
{
content.AddTemplate(importedPage, 1f, 0, 0, 1f, 0, 0);
}
}
}
document.Close();
return output.GetBuffer();
}
}
}