FTP Class Improvement Help Needed


P

pmclinn

I have been using this FTP class for ever and it has worked great
until recently. Normally I'm only downloading files that range in
size from 1-2 meg in size. Now I have a file that is 1.2 gigs and I'm
getting the system out of memory error. Is there a way to stream
directly to a file instead of memory?

Imports System.IO
Imports System.Net
Imports System.Text

Public Class clsftp
Public Function Download(ByVal destinationFile As String, ByVal
downloadUri As Uri) As FtpStatusCode

Try
' Check if the URI is and FTP site
If Not (downloadUri.Scheme = Uri.UriSchemeFtp) Then
Throw New ArgumentException("URI is not an FTp site")
End If

' Set up the request
Dim ftpRequest As FtpWebRequest =
CType(WebRequest.Create(downloadUri), FtpWebRequest)

' use the provided credentials
If Me.m_isAnonymousUser = False Then
ftpRequest.Credentials = New
NetworkCredential(Me.m_userName, Me.m_password)
End If

' Download a file. Look at the other methods to see all of
the potential FTP features
ftpRequest.Method = WebRequestMethods.Ftp.DownloadFile

' get the response object
Dim ftpResponse As FtpWebResponse =
CType(ftpRequest.GetResponse, FtpWebResponse)
Dim stream As Stream = Nothing
Dim reader As StreamReader = Nothing
Dim writer As StreamWriter = Nothing

' get the file as a stream from the response object and
write it as
' a file stream to the local PC
Try
stream = ftpResponse.GetResponseStream
reader = New StreamReader(stream, Encoding.UTF8)
writer = New StreamWriter(destinationFile, False)
writer.Write(reader.ReadToEnd)
Return ftpResponse.StatusCode
Finally
' Allways close all streams
stream.Close()
reader.Close()
writer.Close()
End Try
Catch ex As Exception
Throw ex
End Try

End Function

Public Property UserName() As String
Get
Return Me.m_userName
End Get
Set(ByVal value As String)
Me.m_userName = value
End Set
End Property

Public Property Password() As String
Get
Return Me.m_password
End Get
Set(ByVal value As String)
Me.m_password = value
End Set
End Property

Public Property IsAnonymousUser() As Boolean
Get
Return Me.m_isAnonymousUser
End Get
Set(ByVal value As Boolean)
Me.m_isAnonymousUser = value
End Set
End Property

Private m_userName As String
Private m_password As String
Private m_isAnonymousUser As Boolean
End Class
 
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G

Guest

try stream in chunks:

....
Dim writer As FileStream = Nothing
Dim readCount As Integer
Dim buffer(5119) As Byte '5K buffer = (5 * 1024)-1

writer = New FileStream(destinationFile, FileMode.Create)
Do
readCount = ftpStream.Read(buffer, 0, buffer.Length)
writer.Write(buffer, 0, readCount)
Loop Until (readCount = 0)

writer.Flush()
....
 

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