Hi john, thanks for your concern,
I have stripped my code to the bare minimum to re-produce the problem, the code is below. Create a new VB. NET project, insert at textbox (TextBox1), label (Label1), and 2 menu items (MenuItem1 and MenuItem2) on the form , then replace the code with the code below. Run program, enter the URL of the file to download in the text box and press MenuItem1 to download.
Once a GPRS connection is estabished and downloading has began, press and hold End Call to close GPRS. The error message I posted earlier will appear.
Code:
Public Class Form1
Private WithEvents m_dm As New DownloadManager
Private Sub MenuItem2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem2.Click
m_dm.Abort()
Me.Close()
End Sub
Private Sub MenuItem1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem1.Click
Me.MenuItem1.Enabled = False
Me.Label1.Text = "Downloading..."
Me.m_dm.DownloadProduct(Me.TextBox1.Text)
End Sub
Private m_receivedBytes As Integer
Private Sub m_downloadService_ProductChuckReceived(ByVal receivedBytes As Integer) Handles m_dm.ProductChuckReceived
m_receivedBytes = receivedBytes
Me.Invoke(New EventHandler(AddressOf ProductChuckReceived))
End Sub
Private Sub ProductChuckReceived(ByVal sender As Object, ByVal e As EventArgs)
Me.Label1.Text = Convert.ToInt32((m_receivedBytes / m_dm.FileSize) * 100) & "%"
End Sub
Private Sub m_downloadService_ProductDownloadedCompleted() Handles m_dm.ProductDownloadedCompleted
Me.Invoke(New EventHandler(AddressOf ProductDownloadedCompleted))
End Sub
Private Sub ProductDownloadedCompleted(ByVal sender As Object, ByVal e As EventArgs)
Me.Label1.Text = "Download complete"
End Sub
End Class
Public NotInheritable Class DownloadManager
Private Const DATA_BLOCK_SIZE As Integer = 65536
Public Event ProductDownloadedCompleted()
Public Event ProductChuckReceived(ByVal receivedBytes As Integer)
Private m_urlRequest As Net.HttpWebRequest = Nothing
Private m_urlResponse As Net.HttpWebResponse
Private m_data() As Byte
Private m_filename As String = ""
Private m_folder As String = "\"
Private m_fileSize As Integer
Private m_fs As IO.FileStream
Private m_abort As Boolean = False
Private m_downloading As Boolean = False
Private m_errMsg As String = ""
Public Sub DownloadProduct(ByVal url As String)
m_abort = False
m_filename = "\" & url.Substring(url.LastIndexOf("/"c) + 1)
m_downloading = True
m_urlRequest = CType(Net.HttpWebRequest.Create(url), Net.HttpWebRequest)
m_urlRequest.Timeout = 20000
m_urlRequest.Method = "GET"
m_urlRequest.KeepAlive = False
m_urlRequest.BeginGetResponse(New AsyncCallback(AddressOf ResponseReceived), Nothing)
End Sub
Private Sub ResponseReceived(ByVal ar As IAsyncResult)
If m_abort = False Then
Try
m_urlResponse = CType(m_urlRequest.EndGetResponse(ar), Net.HttpWebResponse)
m_data = New Byte(DATA_BLOCK_SIZE) {}
m_fileSize = Convert.ToInt32(m_urlResponse.ContentLength)
If IO.File.Exists(m_filename) Then
IO.File.Delete(m_filename)
End If
m_fs = New IO.FileStream(m_filename, IO.FileMode.Create)
Catch ex As Net.WebException
m_errMsg = ex.Message
Catch ex As IO.IOException
m_errMsg = ex.Message
End Try
End If
If m_abort OrElse m_errMsg <> "" Then
Else
RaiseEvent ProductChuckReceived(0)
m_urlResponse.GetResponseStream().BeginRead(m_data, 0, DATA_BLOCK_SIZE, New AsyncCallback(AddressOf OnDataRead), Me)
End If
End Sub
Sub OnDataRead(ByVal res As IAsyncResult)
If m_abort = False Then
Dim bytesWrite As Integer = m_urlResponse.GetResponseStream().EndRead(res)
m_fs.Write(m_data, 0, bytesWrite)
If bytesWrite > 0 Then
If m_abort = False Then
RaiseEvent ProductChuckReceived(Convert.ToInt32(m_fs.Position))
Try
m_urlResponse.GetResponseStream().BeginRead(m_data, 0, DATA_BLOCK_SIZE, New AsyncCallback(AddressOf OnDataRead), Me)
Catch ex As Exception
End Try
End If
Else
If m_fs.Length <> Me.m_fileSize Then
m_abort = True
Me.m_errMsg = "Error downloading file."
End If
m_urlResponse.Close()
m_urlRequest.Abort()
m_urlResponse.GetResponseStream.Close()
If m_abort = False Then
m_fs.Close()
m_fs = Nothing
RaiseEvent ProductDownloadedCompleted()
End If
End If
End If
If m_abort Then
m_fs.Close()
m_fs = Nothing
Try
If IO.File.Exists(m_filename) Then
IO.File.Delete(m_filename)
End If
Catch ex As Exception
End Try
End If
End Sub
Public Sub Abort()
m_abort = True
If m_downloading Then
m_urlRequest.Abort()
m_urlRequest = Nothing
m_urlResponse.Close()
m_urlResponse = Nothing
End If
End Sub
Public ReadOnly Property FileSize() As Integer
Get
Return m_fileSize
End Get
End Property
Public Function Aborted() As Boolean
Return m_abort
End Function
End Class Thanks buddy,