Load Torrent in VB.NET with Monotorrent - vb.net

Question

im making a simply app to download torrent files, using MonoTorrent. But i cant load the torrent properly, and I've looked all available information.
That's the code im using:
Imports MonoTorrent.BEncoding
Imports MonoTorrent.Client
Imports MonoTorrent.Client.Tracker
Imports MonoTorrent.Common
Imports System.IO
Imports System.Net
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
End Sub
End Class
Module BitTorrentAnnounceReader
Sub main()
'load Torrentfile
Dim TorrentFile As torrent = ("D:\youtorrent.torrent")
Console.WriteLine(TorrentFile.Name)
'generate annouce paramters
'since we simluate a BitTornado Client double check PeerID and Key Paramter
Dim AnnounceParameter As New AnnounceParameters
AnnounceParameter.BytesLeft = TorrentFile.Size
AnnounceParameter.BytesUploaded = 0
AnnounceParameter.BytesDownloaded = 0
AnnounceParameter.Port = 12224
AnnounceParameter.InfoHash = TorrentFile.InfoHash
AnnounceParameter.PeerId = "T03I-----" & GenerateTorrentClientKeys(11, 1)
AnnounceParameter.ClientEvent = TorrentEvent.Started
'a torrentfile can have more than one url, we use only the first one
'the url should have http to work for this example
Dim AnnounceUrl As String = TorrentFile.AnnounceUrls.Item(0).Item(0).ToString
Console.WriteLine(AnnounceUrl)
'the full announceurl that will fired to tracker
'we are simulating a BitTorando Client
Dim FullAnnounceUrl As String = CreateAnnounceString(AnnounceParameter, AnnounceUrl, GenerateTorrentClientKeys(6))
'building a webrequest for tracker request; some silly line look at comments on
'MonoTorrent.Client.Tracker.HTTPTracker.Announce
Dim req As HttpWebRequest = CType(WebRequest.Create(FullAnnounceUrl), HttpWebRequest)
req.KeepAlive = False
req.Proxy = New WebProxy
'we want to simulate a BitTornado Client, so http headers
req.UserAgent = "User-Agent: BitTornado/T-0.3.18"
'to simulate full client we need also gzip but for better usage we dont use it
' req.Headers.Add("Accept-Encoding", "gzip")
' If (resp.ContentEncoding.ToLower().Contains("gzip")) Then
' Str = New IO.Compression.GZipStream(Str, IO.Compression.CompressionMode.Decompress)
Dim response As HttpWebResponse = req.GetResponse
Dim fs As Stream = WebResponseToStream(response)
Dim peers As List(Of Peer) = AnnounceGetPeerList(fs)
Console.WriteLine("Tracker returned:" & peers.Count)
For Each PeerInfo As Peer In peers
Console.WriteLine(PeerInfo.ConnectionUri.Host & ":" & PeerInfo.ConnectionUri.Port)
Next
Console.ReadKey()
End Sub
''' <summary>
''' Generate a random key depending on which TorrentClient to simulate
''' </summary>
''' <param name="len"></param>
''' <param name="keys"></param>
''' <returns></returns>
''' <remarks></remarks>
Function GenerateTorrentClientKeys(ByVal len As Integer, Optional ByVal keys As Integer = 1) As String
Dim Chars() As String = {"abcdefghijklmnopqrstuvwxyz0123456789", "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"}
'Chars[0] = uTorrent Keys
'Chars[1] = BitTornado Keys
Dim str As String = ""
Dim r As New System.Random()
For i = 1 To len
str &= Chars(keys).Substring(r.Next(1, Chars(keys).Length), 1)
Next
Return str
End Function
''' <summary>
''' A simple way of parsing a bencoded peerlist. it will autodecode compact mode request
''' you can find the full announce parser in the orignal file:
'''
''' MonoTorrent.Client.Tracker.HTTPTracker.HandleAnnounce
''' http://anonsvn.mono-project.com/viewvc/trunk/bitsharp/src/MonoTorrent/MonoTorrent.Client/Tracker/HTTPTracker.cs
''' </summary>
''' <param name="fs"></param>
''' <returns></returns>
''' <remarks></remarks>
Function AnnounceGetPeerList(ByVal fs As Stream) As List(Of Peer)
'you can also use a file with a torrenrequest
'Dim reader As New RawReader(IO.File.Open("file.req", IO.FileMode.Open), False)
'decode the bencoded stream
Dim dictionary As BEncodedDictionary = BEncodedValue.Decode(Of BEncodedDictionary)(fs)
Dim peers As New List(Of Peer)
For Each keypair In dictionary
Select Case keypair.Key.ToString
Case "interval"
'MsgBox TimeSpan.FromSeconds(int.Parse(keypair.Value.ToString()));
'MsgBox(keypair.Value.ToString)
Case "peers"
If TypeOf keypair.Value Is BEncodedList Then
peers.AddRange(Peer.Decode(DirectCast(keypair.Value, BEncodedList)))
ElseIf TypeOf keypair.Value Is BEncodedString Then
peers.AddRange(Peer.Decode(DirectCast(keypair.Value, BEncodedString)))
End If
Case Else
'MsgBox("HttpTracker - Unknown announce tag received:" & keypair.Key.ToString() & keypair.Value.ToString())
End Select
Next
Return peers
End Function
''' <summary>
''' Original CreateAnnounceString is private only and we need to modify it a little bit; this the old one out of svn
''' they have created here a better function that uses UriQueryBuilder but its oversized here
'''
''' MonoTorrent.Client.Tracker.HTTPTracker.CreateAnnounceString
''' http://anonsvn.mono-project.com/viewvc/trunk/bitsharp/src/MonoTorrent/MonoTorrent.Client/Tracker/HTTPTracker.cs?revision=141866
''' </summary>
''' <param name="parameters"></param>
''' <param name="Uri">AnnounceURL of the TorrentFile</param>
''' <param name="Key">a radon key paramter</param>
''' <returns>url to use with a WebRequest</returns>
''' <remarks></remarks>
Private Function CreateAnnounceString(ByVal parameters As AnnounceParameters, ByVal Uri As String, ByVal Key As String) As String
Dim sb As New System.Text.StringBuilder(256)
'base.LastUpdated = DateTime.Now;
' FIXME: This method should be tidied up. I don't like the way it current works
sb.Append(Uri)
sb.Append(If(Uri.Contains("?"), "&"c, "?"c))
sb.Append("info_hash=")
sb.Append(parameters.InfoHash.UrlEncode())
sb.Append("&peer_id=")
sb.Append(parameters.PeerId)
sb.Append("&port=")
sb.Append(parameters.Port)
If parameters.SupportsEncryption Then
sb.Append("&supportcrypto=1")
End If
If parameters.RequireEncryption Then
sb.Append("&requirecrypto=1")
End If
sb.Append("&uploaded=")
sb.Append(parameters.BytesUploaded)
sb.Append("&downloaded=")
sb.Append(parameters.BytesDownloaded)
sb.Append("&left=")
sb.Append(parameters.BytesLeft)
sb.Append("&compact=1")
' Always use compact response
sb.Append("&numwant=")
sb.Append(100)
If Not Uri.Contains("&key=") AndAlso Not Uri.Contains("?key=") Then
sb.Append("&key=")
' The 'key' protocol, used as a kind of 'password'. Must be the same between announces
sb.Append(Key)
End If
If parameters.Ipaddress IsNot Nothing Then
sb.Append("&ip=")
sb.Append(parameters.Ipaddress)
End If
' If we have not successfully sent the started event to this tier, override the passed in started event
' Otherwise append the event if it is not "none"
'if (!parameters.Id.Tracker.Tier.SentStartedEvent)
'{
' sb.Append("&event=started");
' parameters.Id.Tracker.Tier.SendingStartedEvent = true;
'}
If parameters.ClientEvent <> TorrentEvent.None Then
sb.Append("&event=")
sb.Append(parameters.ClientEvent.ToString().ToLower())
End If
Return sb.ToString()
End Function
''' <summary>
''' HttpWebResponse and GetResponseStream dont gives use a full readable stream so we must convert it
'''
''' Look at: MonoTorrent.Client.Tracker.HTTPTracker.DecodeResponse
''' http://anonsvn.mono-project.com/viewvc/trunk/bitsharp/src/MonoTorrent/MonoTorrent.Client/Tracker/HTTPTracker.cs
''' or
''' http://bytes.com/topic/c-sharp/answers/232436-download-binary-file-http#post949811
''' </summary>
''' <param name="response"></param>
''' <returns></returns>
''' <remarks></remarks>
Function WebResponseToStream(ByVal response As HttpWebResponse) As Stream
Dim responseStream As Stream = response.GetResponseStream
Dim fs As MemoryStream = New MemoryStream(256)
Dim buffer As Byte() = New Byte(4095) {}
Dim length As Integer = responseStream.Read(buffer, 0, 4096)
While length > 0
fs.Write(buffer, 0, length)
length = responseStream.Read(buffer, 0, 4096)
End While
fs.Seek(0, SeekOrigin.Begin)
Return fs
End Function
End Module
The problem only appears in the load file .torrent part:
Dim TorrentFile As **torrent** = ("D:\youtorrent.torrent")
Vb.net throws me an error of "Type expected 'on the text torrent. there any solution? Thanks to all!

Answer 1

Try
Dim TorrentFile As torrent = Torrent.Load("D:\youtorrent.torrent")