Class Download
#Region "Events"
Public Event DownloadStarted As EventHandler
Public Event DownloadCompleted As EventHandler
Public Event DownloadProgressChanged As EventHandler
Public Event DownloadAborted As EventHandler
Public Event DownloadPaused As EventHandler
Public Event DownloadResumed As EventHandler
#End Region
#Region "Attributes"
Private s, d As String
Private b, sec, v As Decimal
Private nt As Decimal
Private t() As Threading.Thread
Private ss As IO.BufferedStream, ds As IO.FileStream, dst As DownStatus
Private WithEvents tim As New Timer With {.Interval = 1000}
#End Region
#Region "Enums"
Enum DownStatus
NoOperation = 0
Downloading
Paused
Completed
End Enum
#End Region
#Region "Constructors"
Public Sub New(ByVal url As String, ByVal filename As String, ByVal threadnumber As Decimal)
s = url
d = filename
b = 0
sec = 0
nt = threadnumber
Array.Resize(t, nt)
For i As Integer = 0 To nt - 1
t(i) = New Threading.Thread(AddressOf Download)
Next
ss = Nothing
ds = Nothing
dst = DownStatus.NoOperation
End Sub
#End Region
#Region "Properties"
Public Property Source() As String
Get
Return s
End Get
Set(ByVal value As String)
s = value
End Set
End Property
Public Property Destination() As String
Get
Return d
End Get
Set(ByVal value As String)
d = value
End Set
End Property
Public ReadOnly Property DownloadedBytes() As Decimal
Get
Return b
End Get
End Property
Public ReadOnly Property Seconds() As Decimal
Get
Return sec
End Get
End Property
Public ReadOnly Property Speed() As Decimal
Get
Return v
End Get
End Property
Public ReadOnly Property DownloadStatus() As DownStatus
Get
Return dst
End Get
End Property
#End Region
#Region "Public methods"
Public Sub StartDownload()
ss = New IO.BufferedStream(Net.WebRequest.Create(s).GetResponse.GetResponseStream)
ds = New IO.FileStream(d, IO.FileMode.OpenOrCreate)
For i As Integer = 0 To nt - 1
t(i).Start()
Next
tim.Start()
dst = DownStatus.Downloading
RaiseEvent DownloadStarted(Me, New EventArgs)
End Sub
Public Sub AbortDownload()
dst = DownStatus.NoOperation
For i As Integer = 0 To nt - 1
t(i).Abort()
Next
tim.Stop()
ds.Close()
ss.Close()
RaiseEvent DownloadAborted(Me, New EventArgs)
End Sub
Public Sub PauseDownload()
dst = DownStatus.Paused
For i As Integer = 0 To nt - 1
t(i).Suspend()
Next
tim.Stop()
RaiseEvent DownloadPaused(Me, New EventArgs)
End Sub
Public Sub ResumeDownload()
tim.Start()
For i As Integer = 0 To nt - 1
t(i).Resume()
Next
dst = DownStatus.Downloading
RaiseEvent DownloadResumed(Me, New EventArgs)
End Sub
#End Region
#Region "Private methods"
Private Sub Download()
While True
Try
ds.WriteByte(ss.ReadByte)
Catch
Exit While
End Try
b += 1
Application.DoEvents()
RaiseEvent DownloadProgressChanged(Me, New EventArgs)
End While
tim.Stop()
ds.Close()
ss.Close()
dst = DownStatus.Completed
nt -= 1
If nt = 0 Then RaiseEvent DownloadCompleted(Me, New EventArgs)
End Sub
#End Region
#Region "Private events"
Private Sub tim_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles tim.Tick
sec += 1
v = b / sec
End Sub
#End Region
End Class
