J'utilise vb.net 2005, j'ai le code suivant exécutant un fil pour télécharger un fichier. Toutefois, le processus échoue parfois lors de la tentative de lecture de la copie locale du fichier. Je pense que je devrais peut-être déverrouiller le fichier local, mais je ne suis pas sûr de savoir comment le faire. Quelqu'un peut-il jeter un coup d'oeil et me conseiller?vb.net 2005, problème de verrouillage de fichier enfilant, je pense
Dim BP1Ended As Boolean = False
Private Sub BackgroundProcess1()
BP1Ended = False
mPadFileStatus = DownloadFile(mstrPadUrl, mLocalFile)
BP1Ended = True
End Sub
'---'
Dim t As System.Threading.Thread
t = New System.Threading.Thread(AddressOf BackgroundProcess1)
t.Start()
Dim ProcessStartTime As Date = Now()
Do While ProcessStartTime.AddMinutes(1) >= Date.Now
Application.DoEvents()
If BP1Ended = True Then
Exit Do
End If
Loop
t.Abort()
PadFileStatus = mPadFileStatus
If BP1Ended = False Then
Application.DoEvents()
AddConsoleMsg("Downloading file.... Aborted", True)
End If
'---'
Public Function DownloadFile(ByVal pstrRequestedFile As String, ByVal pstrDestinationFile As String, Optional ByVal TimeOut As Integer = 120) As DownloadStatus
Dim input As IO.Stream
Dim Req As System.Net.HttpWebRequest = Nothing
Dim Response As System.Net.HttpWebResponse
Try
Req = System.Net.HttpWebRequest.Create(pstrRequestedFile)
Catch ex As Exception
Return DownloadStatus.UnknownError
End Try
Req.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)"
Req.Timeout = TimeOut * 1000 '120 * 1000 '1 second = 1 000 milliseconds
Try
Response = Req.GetResponse
input = Response.GetResponseStream
Dim streamreader As New StreamReader(input, System.Text.Encoding.GetEncoding("windows-1252")) 'System.Text.Encoding.UTF8)'
Dim s_response As String = streamreader.ReadToEnd()
streamreader.Close()
Dim filestream As New FileStream(pstrDestinationFile, FileMode.Create)
Dim streamwriter As New StreamWriter(filestream, System.Text.Encoding.GetEncoding("windows-1252")) ' System.Text.Encoding.UTF8)'
streamwriter.Write(s_response)
streamwriter.Flush()
streamwriter.Close()
Dim length As Long = 1000000 * 100
Dim pos As Long = 0
If Response.ContentLength > 0 Then
length = Response.ContentLength
End If
If length > 0 Then
Return DownloadStatus.OK
End If
input.Close()
Catch ew As System.Net.WebException
If ew.Status = WebExceptionStatus.NameResolutionFailure Or ew.Status = WebExceptionStatus.ProtocolError Then
Return DownloadStatus.FileNotFound
ElseIf ew.Status <> WebExceptionStatus.Success Then
Return DownloadStatus.UnknownError
End If
'Dim errorRespone As HttpWebResponse = CType(ew.Response, HttpWebResponse)
'If errorRespone.StatusCode = HttpStatusCode.NotFound Then '404
' Return DownloadStatus.FileNotFound
'Else
' Return DownloadStatus.UnknownError
'End If'
Catch ex As Exception 'Don't know'
Return DownloadStatus.UnknownError
End Try
End Function
'---'
Dim OpenFile As FileStream
'OpenFile = New FileStream(pstrPadFile, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite)
'FAILS HERE
OpenFile = New FileStream(pstrPadFile, FileMode.Open, FileAccess.Read, FileShare.Read)
OK, cool, donc je n'ai pas besoin de flush et ferme après l'écriture? – Jules
Non, vous n'avez besoin ni de «Flush», ni de «Close». 'Dispose' fera les deux. Et l'envelopper dans une instruction 'Using' garantira que' Dispose' est appelé même si une exception est levée. –