Creating Torrents
Version 10 (Alan McGovern, 07/30/2009 12:46 AM) → Version 11/13 (Alan McGovern, 10/03/2010 08:28 PM)
h1. Creating Torrents
[[Creating Torrents#Example-1|Example 1]] shows how to create a simple torrent.
[[Creating Torrents#Example-2|Example 2]] shows how to create a torrent asynchronously so that it does not block the main thread in your application.
[[Creating Torrents#Example-3|Example 3]] shows how to abort the creation of a torrent after it has started
[[Creating Torrents#Example-4|Example 4]] shows how to create a torrent and load it without having to hash the data a second time
h2. Example 1
<pre><code class="java">
// 'path' is the location of the file/folder which is going to be converted
// to a torrent. 'savePath' is where the .torrent file will be saved.
void CreateTorrent(string path, string savePath)
{
// The class used for creating the torrent
TorrentCreator c = new TorrentCreator();
// Add one tier which contains two trackers
List<string> tier = new List<string>();
tier.Add("http://www.example.com/announce");
tier.Add("http://backup.example.com/announce");
c.Announces.Add(tier);
c.Comment = "This is the comment";
c.CreatedBy = "Alan using " + VersionInfo.ClientVersion;
c.Publisher = "www.homepage.com";
// Set the torrent as private so it will not use DHT or peer exchange
// Generally you will not want to set this.
c.Private = true;
// Path can be either a directory *or* a file.
c.Path = path;
// Every time a piece has been hashed, this event will fire. It is an
// asynchronous event, so you have to handle threading yourself.
c.Hashed += delegate (object o, TorrentCreatorEventArgs e) {
Console.WriteLine("Current File is {0}% hashed", e.FileCompletion);
Console.WriteLine("Overall {0}% hashed", e.OverallCompletion);
Console.WriteLine("Total data to hash: {0}", e.OverallSize);
};
// Create the torrent file and save it directly to the specified path
// Different overloads of 'Create' can be used to save the data to a Stream
// or just return it as a BEncodedDictionary (its native format) so it can be
// processed in memory
c.Create(save_path);
}
</code></pre>
h2. Example 2
<pre><code class="java">
// 'path' is the location of the file/folder which is going to be converted
// to a torrent. 'savePath' is where the .torrent file will be saved.
void CreateTorrent(string path, string savePath)
{
// The class used for creating the torrent
TorrentCreator c = new TorrentCreator();
// Fill in the path, trackers as in Example 1
FillInStandardInformation(c);
// Create the torrent asynchronously
c.BeginCreate(c, TorrentCreated);
}
void TorrentCreated(IAsyncResult result)
{
TorrentCreator c = (TorrentCreator)result.AsyncState;
// If any errors occured while creating the torrent, they
// will be rethrown here.
try
{
// Open the destination file and use the EndCreate overload which
// writes the data directly to the Stream.
using (FileStream stream = File.OpenWrite(savePath))
c.EndCreate(result, stream);
}
catch (Exception ex)
{
Console.WriteLine("Error creating torrent: {0}", ex);
}
}
</code></pre>
h2. Example 3
<pre><code class="java">
// 'path' is the location of the file/folder which is going to be converted
// to a torrent. 'savePath' is where the .torrent file will be saved.
void CreateTorrent(string path, string savePath)
{
// The class used for creating the torrent
TorrentCreator c = new TorrentCreator();
// Fill in the path, trackers as in Example 1
FillInStandardInformation(c);
// Create the torrent asynchronously and keep a reference to the
// IAsyncResult it returns
TorrentCreatorAsyncResult result = c.BeginCreate(c, TorrentCreated);
// Abort creation of the torrent (can be called at any stage). Note, you
// can only abort the creation if the torrent is created asynchronously
result.Abort();
}
</code></pre>
h2. Example 4
<pre><code class="java">
public static void CreateAndLoadTorrent (ClientEngine engine)
{
// Instantiate a torrent creator
TorrentCreator creator = new TorrentCreator ();
// Create a TorrentFileSource which is used to populate the .torrent
ITorrentFileSource files = new TorrentFileSource ("somefile.dat");
// Create the Torrent metadata blob
BEncodedDictionary torrentDict = creator.Create (files);
// Instantiate a torrent
Torrent torrent = Torrent.Load (torrentDict);
// Create a fake fast resume data with all the pieces set to true so we
// don't have to hash the torrent when adding it directly to the engine.
BitField bitfield = new BitField (torrent.Pieces.Count).Not ();
FastResume fastResumeData = new FastResume(torrent.InfoHash, bitfield);
// Create a TorrentManager so the torrent can be downloaded and load
// the FastResume data so we don't have to hash it again.
TorrentManager manager = new TorrentManager (torrent, "SavePath", new TorrentSettings ());
manager.LoadFastResume (fastResumeData);
// Register it with the engine and start the download
engine.Register (manager);
engine.StartAll ();
}
</code></pre>