Question

After FTP - Error message "The process cannot access the file because it is being used by another process"

Asked by: dakinegeek

Hey Guys,

I have a pretty simple VB.NET script that does the following:
  1) Zips up files in a directory
  2) Send the Zip file via FTP
  3) Archives the Zip file
  4) Deletes directory and all files within

The problem I'm have is that when it tries to delete the original files, I get the following error message:

    "The process cannot access the file because it is being used by another process"

Any ideas?

Private Sub Upload(ByVal source As String, ByVal target As String, ByVal credential As NetworkCredential)
        Try
            Dim request As FtpWebRequest = DirectCast(WebRequest.Create(target), FtpWebRequest)
            request.Method = WebRequestMethods.Ftp.UploadFile
            request.Credentials = credential
 
            Dim reader As New FileStream(source, FileMode.Open)
            Dim buffer(Convert.ToInt32(reader.Length - 1)) As Byte
            reader.Read(buffer, 0, buffer.Length)
            reader.Close()
            request.ContentLength = buffer.Length
 
            Dim stream As Stream = request.GetRequestStream
            stream.Write(buffer, 0, buffer.Length)
            stream.Close()
 
            Dim response As FtpWebResponse = DirectCast(request.GetResponse, FtpWebResponse)
            response.Close()
        Catch ex As Exception
            MessageBox.Show("FTP Error: " & ex.Message)
            Me.Close()
        End Try
    End Sub
 
    Public Sub MoveDirectory(ByVal path As String)
        Dim ArrPath() As String = path.Split("\")
        Dim ArrPathLen As Integer = ArrPath.Length - 1
        Dim ParentDir As String = ""
        Dim BatchName As String
        Dim i As Integer = 0
        Dim FolderName As String
 
        FolderName = ArrPath(0)
        For i = 0 To ArrPathLen
            If FolderName = "Processed" Then
                ParentDir = ArrPath(i)
                Exit For
            Else
                FolderName = ArrPath(i)
            End If
        Next
 
        BatchName = ArrPath(ArrPathLen)
 
        Dim ToDirectory As String = 'I removed this
 
        Try
            Directory.Move(path, ToDirectory)
            Directory.Delete(tb_Path.Text, True)
        Catch ex As Exception
            MessageBox.Show("Directory Move Error: " & ex.Message)
        End Try
 
    End Sub

                                  
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Asked On
2008-04-01 at 17:40:34ID23287780
Tags

Microsoft

,

.Net

,

VB.NET

Topic

Microsoft Visual Basic.Net

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: maatthiasPosted on 2008-04-02 at 13:04:49ID: 21266881

Where is this exception thrown?  At
Directory.Delete(tb_Path.Text, True)
??

 

by: dakinegeekPosted on 2008-04-02 at 13:47:35ID: 21267345

Yup!  When I skip the FTP portion.  Everything works fine.

 

by: GreenGhostPosted on 2008-04-02 at 15:24:49ID: 21268166

The code looks correct. You could dispose the file stream object, but that should not make a difference as you are closing the stream. I see another problem with your code though. You should fix that, and perhaps the file locking problem goes away also:

You are not using the FileStream.Read method correctly. It returns the number of bytes actually read, which can be less than the bytes requested, so you have to loop until you have read all the data.

Or better yet, just use the nice method in the File class that does it all for you:

Dim buffer As Byte() = File.ReadAllBytes(source)

 

by: dakinegeekPosted on 2008-04-02 at 15:48:54ID: 21268308

That seems to have fixed it.  Thanks!

20120131-EE-VQP-002

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