problème downloader multiple files

**Miska59** · 27/07/2024, 20h52

Bonsoir,

j’arrive pas à télécharger 2 fichier à la fois avec listview. le premier fonctionne mais pas le deuxième. avez-vous une solution pour télécharger 2 fichier à la fois après a la suite.

voici en image :
Nom : Capture d’écran 2024-07-27 203929.png
Affichages : 178
Taille : 7,8 Ko

Nom : Capture d’écran 2024-07-27 203929.png
Affichages : 178
Taille : 7,8 Ko

mon code from1 :

Code :

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For Each Item As ListViewItem In ListView1.CheckedItems
                        Download.InfoDownloader(Item.Text, Item.SubItems(1).Text, Folder.SelectedPath)
                    Next
                    Download.Show()
...etc

mon code avec download :

Code :

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Private WithEvents _Downloader As New WebFileDownloader
    Private counter As Integer = 0
 
    Public Sub InfoDownloader(Names As String, URL As String, destination As String)
        Dim lvi As New ListViewItem(Names)
        lvi.UseItemStyleForSubItems = False
        lvi.SubItems.Add("Vérifications en cours....").ForeColor = Color.DarkBlue
        lvi.ImageIndex = 0
        LvDownloads.Items.Add(lvi)
        Task.Factory.StartNew(Sub()
                                  AddHandler _Downloader.DownloadProgressChanged, New WebFileDownloader.ProgressChangedEventHandler(AddressOf download_DownloadProgress)
                                  AddHandler _Downloader.DownloadCompleted, New WebFileDownloader.DownloadCompletedEventHandler(AddressOf download_DownloadComplete)
                                  _Downloader.DownloadFile(URL, Path.Combine(destination, Names & Path.GetExtension(URL)))
                              End Sub)
    End Sub
 
    Private Sub download_DownloadComplete(sender As Object, e As DownloadCompletedArgs)
        If e.ErrorMessage Then
            LvDownloads.Invoke(Sub()
                                   LvDownloads.Items(counter).SubItems(1).Text = "Avec succès..."
                                   LvDownloads.Items(counter).SubItems(1).ForeColor = Color.Blue
                               End Sub)
            If counter = LvDownloads.Items.Count Then
                counter += 1
            Else
                Exit Sub
            End If
        Else
            LvDownloads.Invoke(Sub()
                                   LvDownloads.Items(counter).SubItems(1).Text = "Erreur de téléchargement de la video"
                                   LvDownloads.Items(counter).SubItems(1).ForeColor = Color.Red
                               End Sub)
        End If
    End Sub
 
    Private Sub download_DownloadProgress(sender As Object, e As DownloadProgressArgs)
        On Error Resume Next
        LvDownloads.Invoke(Sub()
                               LvDownloads.Items(counter).SubItems(1).Text = "Téléchargement(" & FormatFileSize(e.BytesReceived) & " / " & FormatFileSize(e.TotalBytesReceived) & ") - " & e.ProgressPercentage & " %"
                               LvDownloads.Items(counter).SubItems(1).ForeColor = Color.Green
                           End Sub)
    End Sub
    Private Function FormatFileSize(byteCount As Long) As String
        Dim suf As String() = {"Bytes", "KB", "MB", "GB"}
        If byteCount = 0 Then Return "0" & suf(0)
        Dim bytes As Long = Math.Abs(byteCount)
        Dim place As Integer = Convert.ToInt32(Math.Floor(Math.Log(bytes, 1024)))
        Dim num As Double = Math.Round(bytes / Math.Pow(1024, place), 1)
        Return (Math.Sign(byteCount) * num).ToString() & " " & suf(place)
    End Function
 
    Private Sub Download_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        System.Net.ServicePointManager.DefaultConnectionLimit = 2
    End Sub
End Class

ma classe WebFileDownloader :

Code :

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Imports System.Net
Imports System.IO
 
Class WebFileDownloader
 
    Public Delegate Sub ProgressChangedEventHandler(ByVal sender As Object, ByVal e As DownloadProgressArgs)
    Public Event DownloadProgressChanged As ProgressChangedEventHandler
    Public Delegate Sub DownloadCompletedEventHandler(ByVal sender As Object, ByVal e As DownloadCompletedArgs)
    Public Event DownloadCompleted As DownloadCompletedEventHandler
 
    Protected Overridable Sub OnDownloadProgressChanged(ByVal sender As Object, ByVal e As DownloadProgressArgs)
        RaiseEvent DownloadProgressChanged(Me, e)
    End Sub
 
    Protected Overridable Sub OnDownloadCompleted(ByVal sender As Object, ByVal e As DownloadCompletedArgs)
        RaiseEvent DownloadCompleted(Me, e)
    End Sub
 
    Sub DownloadFile(ByVal URL As String, ByVal Location As String)
        Try
            Dim uri As New Uri(URL)
            If ((uri.Scheme <> uri.UriSchemeHttp) And (uri.Scheme <> uri.UriSchemeHttps)) Then
                Throw New Exception("URL invalide. L'URL doit commencer par ""http://"" ou ""https://"".")
                Exit Sub
            End If
            Dim request As HttpWebRequest = CType(WebRequest.Create(New Uri(URL)), HttpWebRequest)
            With request
                .Method = "GET"
                .Timeout = 20000
                .KeepAlive = True
                .UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0"
            End With
            Using response As HttpWebResponse = CType(request.GetResponse(), HttpWebResponse)
                If response.StatusCode = HttpStatusCode.OK Then
                    Dim _ContentLenght As Integer = response.ContentLength
                    Using stream As Stream = response.GetResponseStream()
                        Using fs As New FileStream(Location, FileMode.Create, FileAccess.Write, FileShare.Write)
                            Dim buffer As Byte() = New Byte(4096 - 1) {}
                            Dim _TotalBytesReceived As Integer = 0
                            Dim isRead As Boolean = True
                            Do
                                Dim readsize As Integer = stream.Read(buffer, 0, buffer.Length)
                                If readsize = 0 Then
                                    isRead = False
                                    Exit Do
                                End If
                                _TotalBytesReceived += readsize
                                fs.Write(buffer, 0, readsize)
                                OnDownloadProgressChanged(Me, New DownloadProgressArgs(_TotalBytesReceived, _ContentLenght))
                            Loop While isRead
                        End Using
                    End Using
                End If
            End Using
            OnDownloadCompleted(Me, New DownloadCompletedArgs(True))
        Catch ex As WebException
            OnDownloadCompleted(Me, New DownloadCompletedArgs(False))
        End Try
    End Sub
 
End Class
 
Class DownloadProgressArgs
 
    Private _BytesReceived As Integer
    Private _TotalBytesReceived As Integer
 
    Public Sub New(ByVal BytesReceived As Integer, ByVal TotalBytesReceived As Integer)
        _BytesReceived = BytesReceived
        _TotalBytesReceived = TotalBytesReceived
    End Sub
 
    Public ReadOnly Property BytesReceived As Integer
        Get
            Return _BytesReceived
        End Get
    End Property
 
    Public ReadOnly Property TotalBytesReceived As Integer
        Get
            Return _TotalBytesReceived
        End Get
    End Property
 
    Public ReadOnly Property ProgressPercentage As Integer
        Get
            If _TotalBytesReceived > 0 Then
                Return Math.Ceiling((_BytesReceived / _TotalBytesReceived) * 100)
            Else
                Return 0
            End If
        End Get
    End Property
End Class
 
Class DownloadCompletedArgs
 
    Private _ErrorMessage As Boolean
 
    Sub New(ErrorMessage As Boolean)
        _ErrorMessage = ErrorMessage
    End Sub
 
    Public ReadOnly Property ErrorMessage As Boolean
        Get
            Return _ErrorMessage
        End Get
    End Property
End Class

pouvez-vous m'aider à télécharger 2 fichier a la fois. Merci d'avance

**Miska59** · 30/07/2024, 19h07

Bonsoir, j'ai refait mon code mais j'arrive pas à comprendre pourquoi j'arrive pas a afficher le téléchargement dans listview.

Code :

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Imports System.IO
Imports System.Threading
 
Public Class Downloader
 
    Private _instances As New ArrayList()
    Private _threads As New ArrayList()
    Private _activeDownloadCount As Integer = 0
    Private _lockObject As New Object()
    Private Delegate Sub delSetStatus(ByVal Status As String, ByVal Mycolor As Color, ByVal f As FileDownloader)
    Public Shared Sub InfoDownloader(Names As String, URL As String, destination As String)
        Downloader._instances = New ArrayList()
        Downloader._threads = New ArrayList()
        Downloader._activeDownloadCount = 0
        Dim download As FileDownloader = Nothing
        Downloader.LvDownload.Items.Add(New ListViewItem(New String() {Names, ""}))
        For Each item As ListViewItem In Downloader.LvDownload.Items
            item.SubItems(1).Text = "Patienter le téléchargement...."
            item.SubItems(1).ForeColor = Color.Blue
            item.UseItemStyleForSubItems = False
            download = New FileDownloader(URL, Path.Combine(destination, Names & Path.GetExtension(URL)))
            item.Tag = download
            Try
                Dim tsDelegate As New ThreadStart(AddressOf download.StartDownload)
                AddHandler download.DownloadStarting, New FileDownloader._DownloadStarting(AddressOf download_DownloadStarting)
                AddHandler download.DownloadCompleted, New FileDownloader.DownloadCompletedEventHandler(AddressOf download_DownloadCompleted)
                AddHandler download.DownloadProgressChanged, New FileDownloader.ProgressChangedEventHandler(AddressOf download_DownloadProgress)
                Dim t As New Thread(tsDelegate)
                t.Name = item.SubItems(0).Text
                Downloader._threads.Add(t)
                Downloader._instances.Add(download)
            Catch ex As ObjectDisposedException
                item.SubItems(1).Text = "Erreur de téléchargement !"
                item.SubItems(1).ForeColor = Color.Red
            End Try
        Next
        StartDownload()
    End Sub
 
    Private Shared Sub download_DownloadCompleted(thread As FileDownloader, e As DownloadCompletedArgs)
        If e.Error IsNot Nothing Then
            SetStatus("Erreur de Téléchargement...", Color.Red, thread)
            Return
        Else
            SyncLock Downloader._lockObject
                Downloader._activeDownloadCount -= 1
            End SyncLock
            SetStatus("Téléchargement terminé...", Color.Blue, thread)
            StartDownload()
            Return
        End If
    End Sub
 
    Private Shared Sub download_DownloadProgress(thread As FileDownloader, e As DownloadProgressArgs)
        SetStatus("Téléchargement( " & Downloader.GetFileSize(e.TotalBytesReceived) & " \ " & Downloader.GetFileSize(e.BytesReceived) & " ) - " & e.ProgressPercentage & " %", Color.Green, thread)
    End Sub
 
    Private Shared Sub download_DownloadStarting(ByVal thread As FileDownloader)
        SetStatus("Le téléchargement va bientôt commencer...", Color.Green, thread)
    End Sub
 
    Private Shared Sub StartDownload()
        Dim j As Integer = 0
        Dim limit As Integer = CInt(Form1.NumericUpDown1.Value)
        Dim iCount As Integer = 0
        SyncLock Downloader._lockObject
            iCount = Downloader._instances.Count
        End SyncLock
        If (iCount <> 0) Then
            For Each thread As Thread In Downloader._threads
                Dim file As FileDownloader = CType(Downloader._instances(j), FileDownloader)
                If file._IsStarted = False Then
                    SyncLock Downloader._lockObject
                        thread.Start()
                        Downloader._activeDownloadCount += 1
                    End SyncLock
                End If
                If Downloader._activeDownloadCount = limit Then
                    Exit For
                End If
                j += 1
            Next
        End If
    End Sub
 
    Private Shared Sub SetStatus(ByVal Status As String, ByVal colorLVi As Color, ByVal f As FileDownloader)
        If Downloader.LvDownload.InvokeRequired Then
            Dim method As New delSetStatus(AddressOf SetStatus)
            Downloader.Invoke(method, New Object() {Status, colorLVi, f})
        Else
            For Each item As ListViewItem In Downloader.LvDownload.Items
                If item.Tag Is f Then
                    SyncLock Downloader._lockObject
                        item.SubItems(1).Text = Status
                        item.SubItems(1).ForeColor = colorLVi
                    End SyncLock
                    Exit For
                End If
            Next
        End If
    End Sub
 
    Private Function GetFileSize(Type As Long) As String
        Dim types As String() = {"Byte", "KB", "MB", "GB"}
        Dim typees As Double = Type
        Dim CSA As Integer = 0
        While typees >= 1024 AndAlso CSA + 1 < types.Length
            CSA += 1
            typees = typees / 1024
        End While
        Return [String].Format("{0:0.##} {1}", typees, types(CSA))
    End Function
 
    Private Sub Download_FormClosing(sender As Object, e As FormClosingEventArgs) Handles MyBase.FormClosing
        If Me._threads.Count > 0 Then
            If (MessageBox.Show("Voulez-vous annuler les téléchargements actifs.", "Annulé", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) = DialogResult.OK) Then
                Me.KillThreads()
            Else
                e.Cancel = True
            End If
        End If
    End Sub
 
    Private Sub KillThreads()
        For Each thread As Thread In Me._threads
            If thread.IsAlive Then
                thread.Abort()
                thread.Interrupt()
            End If
        Next
        Me._threads = New ArrayList
        Me._instances = New ArrayList
    End Sub
End Class

mon code FileDownloader :

Code :

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Imports System.Net
Imports System.IO
 
Public Class FileDownloader
 
    Private _Url As String = String.Empty
    Private _DirectoryPath As String = String.Empty
    Public _IsStarted As Boolean = False
    Public Delegate Sub _DownloadStarting(ByVal thread As FileDownloader)
    Public Event DownloadStarting As _DownloadStarting
    Public Delegate Sub ProgressChangedEventHandler(ByVal thread As FileDownloader, ByVal e As DownloadProgressArgs)
    Public Event DownloadProgressChanged As ProgressChangedEventHandler
    Public Delegate Sub DownloadCompletedEventHandler(ByVal thread As FileDownloader, ByVal e As DownloadCompletedArgs)
    Public Event DownloadCompleted As DownloadCompletedEventHandler
 
    Protected Overridable Sub OnDownloadStarting(ByVal thread As FileDownloader)
        RaiseEvent DownloadStarting(Me)
    End Sub
    Protected Overridable Sub OnDownloadProgress(ByVal thread As FileDownloader, ByVal e As DownloadProgressArgs)
        RaiseEvent DownloadProgressChanged(Me, e)
    End Sub
    Protected Overridable Sub OnDownloadCompleted(ByVal thread As FileDownloader, ByVal e As DownloadCompletedArgs)
        RaiseEvent DownloadCompleted(Me, e)
    End Sub
 
    Public Sub New(ByVal Url As String, ByVal directory As String)
        _Url = Url
        _DirectoryPath = directory
    End Sub
 
    Public Sub StartDownload()
        If String.IsNullOrEmpty(_Url) Then
            Throw New ArgumentException("Veuillez fournir un URL.")
        End If
        If String.IsNullOrEmpty(_DirectoryPath) Then
            Throw New ArgumentException("Veuillez fournir une destination.")
        End If
        _IsStarted = True
        onDownloadStarting(Me)
        Try
            Dim request As HttpWebRequest = CType(WebRequest.Create(New Uri(_Url)), HttpWebRequest)
            With request
                .Method = "GET"
                .Timeout = 20000
                .KeepAlive = True
                .UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0"
            End With
            Using response As HttpWebResponse = CType(request.GetResponse(), HttpWebResponse)
                If response.StatusCode = HttpStatusCode.OK Then
                    Dim _ContentLenght As Integer = response.ContentLength
                    Using stream As Stream = response.GetResponseStream()
                        Using fs As New FileStream(_DirectoryPath, FileMode.Create, FileAccess.Write, FileShare.Write)
                            Dim buffer As Byte() = New Byte(4096 - 1) {}
                            Dim _TotalBytesReceived As Integer = 0
                            Dim isRead As Boolean = True
                            Do
                                Dim readsize As Integer = stream.Read(buffer, 0, buffer.Length)
                                If readsize = 0 Then
                                    isRead = False
                                    Exit Do
                                End If
                                _TotalBytesReceived += readsize
                                fs.Write(buffer, 0, readsize)
                                OnDownloadProgress(Me, New DownloadProgressArgs(_TotalBytesReceived, _ContentLenght))
                            Loop While isRead
                        End Using
                    End Using
                End If
            End Using
            OnDownloadCompleted(Me, New DownloadCompletedArgs(Nothing, False))
        Catch ex As Exception
            OnDownloadCompleted(Me, New DownloadCompletedArgs(ex, False))
        End Try
    End Sub
End Class
 
Public Class DownloadCompletedArgs : Inherits System.EventArgs
 
    Private _Error As Exception
    Private _Cancelled As Boolean
 
    Public Sub New(ByVal Err As Exception, ByVal Cancelled As Boolean)
        _Error = Err
        _Cancelled = Cancelled
    End Sub
 
    Public ReadOnly Property [Error]() As Exception
        Get
            Return _Error
        End Get
    End Property
 
    Public ReadOnly Property Cancelled() As Boolean
        Get
            Return _Cancelled
        End Get
    End Property
End Class
 
Public Class DownloadProgressArgs : Inherits System.EventArgs
 
    Private _BytesReceived As Integer
    Private _TotalBytesReceived As Integer
 
    Public Sub New(ByVal BytesReceived As Integer, ByVal TotalBytesReceived As Integer)
        _BytesReceived = BytesReceived
        _TotalBytesReceived = TotalBytesReceived
    End Sub
 
    Public ReadOnly Property BytesReceived As Integer
        Get
            Return _BytesReceived
        End Get
    End Property
 
    Public ReadOnly Property TotalBytesReceived As Integer
        Get
            Return _TotalBytesReceived
        End Get
    End Property
 
    Public ReadOnly Property ProgressPercentage As Integer
        Get
            If _TotalBytesReceived > 0 Then
                Return Math.Ceiling((_BytesReceived / _TotalBytesReceived) * 100)
            Else
                Return 0
            End If
        End Get
    End Property

j'arrive pas à comprendre pourquoi ça affiche pas dans listview le téléchargement dans la form download? aider moi svp....

problème downloader multiple files

VB.NET

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