Calculate Download time and stop a download ?

[Flow96]

Hello guys,

Iam working on a Download Manager, but I dont know the codes for calculating the download time and how to stop ( not cancel) the download and then continue it. Perhaps the codes for the Download-speed,percentage and size could help you.

 Public Sub ChangeTexts(ByVal length As Long, ByVal position As Integer, ByVal percent As Integer, ByVal speed As Double)

        Me.lblsize.Text = "Size : " & Math.Round((length / 1024), 2) & " KB"
        Me.lblstat.Text = "Status : " & Math.Round((position / 1024), 2) & " KB of " & Math.Round((length / 1024), 2) & "KB (" & Me.ProgressBar1.Value & "%)"
        Me.lblpercent.Text = Me.ProgressBar1.Value & "%"
        If speed = -1 Then
            Me.lblspd.Text = "Speed : " & "calculating..."
        Else
            Me.lblspd.Text = "Speed : " & Math.Round((speed / 1024), 2) & " KB/s"
        End If

        Me.ProgressBar1.Value = percent
    End Sub

I hope you can help me.

[ForumAccount]

Are you seeing unexpected results from your code? Are you using all the same units? Remember, kbps <> kBps.

[Flow96]

Im using this Download Manager http://www.mediafire.com/download.php?mhuktzznl2m, please have a look so it will be easier for you to help me because its very difficult for me to explain things ( Im from Germany )

[ForumAccount]

I am very skeptical to download code from someone else. Your first post was explained quite well, why not give it a shot?

[Flow96]

I thought it would be a help for you if you saw the whole code for my Downloader (The Code written is by Carmine_XX ) because than you will have a better chance to help me. I searched on the internet and didnt found anything, so I have to ask in Forums where people could have the right answer. Perhaps you have some ideas or tips how to solve my problem, it would be great.

[Flow96]

So minutes ago I found the Code how to calculate the Download Time in a German forum http://www.vb-paradise.de/programmie...ftp-ermitteln/ wriiten by the the user 4typen :
1. Timer (Timer1) -> Change interval to "1000".
2. Declare :

Dim sek As Integer = 0Dim kb As Double

2. Connect Progressbar to the Uploadprogress (Link)
4. Code for the Timer1:

 Try
sek += 1
If sek > 3 Then
Dim zeitproeinheit As Double = sek / ProgressBar1.ProgressValue
Dim nochzumachen As Integer = 100 - ProgressBar1.ProgressValue
Dim min As Long = 0
Dim zeit As Integer = nochzumachen * zeitproeinheit
If zeit > 60 Then
Do Until zeit < 60
zeit -= 60
min += 1
Loop
End If
If zeit < 10 Then
Label1.Text = "Noch " & min & ":0" & zeit & " (" & Math.Round(kb, 0) & " KB/s)"
Else
Label1.Text = "Noch " & min & ":" & zeit & " (" & Math.Round(kb, 0) & " KB/s)"
End If
Else
Label1.Text = "Calculate time..."
End If
Catch
End Try

So one problem is solved, but I also need help with the Code for stopping the download and continue it after a while.

[ForumAccount]

It is probably better to post that question is a new thread. Also, how are you downloading?

[Flow96]

Here is the code of the Form, so you can see how it works :

Imports System.Net
Public Class Form5
    Dim whereToSave As String
    Delegate Sub ChangeTextsSafe(ByVal length As Long, ByVal position As Integer, ByVal percent As Integer, ByVal speed As Double)
    Delegate Sub DownloadCompleteSafe(ByVal cancelled As Boolean)
    Dim sek As Integer = 0
    Dim kb As Double

    Public Sub DownloadComplete(ByVal cancelled As Boolean)
        Me.txtfilename.Enabled = True

        If cancelled Then

            Me.lblstat.Text = "Download Abgebrochen"
            MessageBox.Show("Der Download wurde abgebrochen !", "Abgebrochen", MessageBoxButtons.OK, MessageBoxIcon.Information)
            Me.Text = "0%" + " " + "von " & Form1.txtfilename5.Text.Split("/"c)(Form1.txtfilename5.Text.Split("/"c).Length - 1) & " - Download abgebrochen"
        Else
            Me.lblstat.Text = "Erfolgreich gedownloadet"
            Me.Text = "100%" + " " + "von " & Form1.txtfilename5.Text.Split("/"c)(Form1.txtfilename5.Text.Split("/"c).Length - 1) & " - Download abgeschlossen"
            Erfolgreich()

        End If
        Me.ProgressBar1.Value = 0
    End Sub
    Private Sub Form5_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
        BackgroundWorker1.WorkerSupportsCancellation = True
        BackgroundWorker1.CancelAsync()
    End Sub
    Private Sub Erfolgreich()
        If RadioButton1.Checked = True And MessageBox.Show("Der Download wurde erfolgreich abgeschlossen !", "Erfolgreicher Download", MessageBoxButtons.OK, MessageBoxIcon.Information) = MsgBoxResult.Ok Then
            Process.Start(whereToSave)
            Me.Close()
            Form1.Show()
        Else

        End If
    End Sub
    Public Sub ChangeTexts(ByVal length As Long, ByVal position As Integer, ByVal percent As Integer, ByVal time As Integer)
        Me.lblstat.Text = Label1.Text & " - " & Math.Round((position / 1048576), 2) & " MB von " & Math.Round((length / 1048576), 2) & "MB (" & Me.ProgressBar1.Value & "%)"
        Me.Text = Me.ProgressBar1.Value & "%" + " " + "von " & Form1.txtfilename5.Text.Split("/"c)(Form1.txtfilename5.Text.Split("/"c).Length - 1) & " - Downloads"
        Downloadzeit()
        Me.ProgressBar1.Value = percent
    End Sub


    Private Sub Form5_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Me.Text = Me.ProgressBar1.Value & "%" + "von " & Form1.txtfilename5.Text.Split("/"c)(Form1.txtfilename5.Text.Split("/"c).Length - 1) & " - Downloads"
        Me.txtfilename.Text = Form1.txtfilename5.Text
        Me.SaveFileDialog1.FileName = Form1.txtfilename5.Text.Split("/"c)(Form1.txtfilename5.Text.Split("/"c).Length - 1)
        Me.lblname.Text = Form1.txtfilename5.Text.Split("/"c)(Form1.txtfilename5.Text.Split("/"c).Length - 1)
        Me.SaveFileDialog1.ShowDialog()
        Me.loc.Text = Me.SaveFileDialog1.FileName
        Downloadfile()
    End Sub
    Private Sub Downloadfile()

        If Me.txtfilename.Text <> "" AndAlso Me.txtfilename.Text.StartsWith("http://") Then
            Me.whereToSave = Me.loc.Text
            Me.SaveFileDialog1.FileName = ""
            Me.txtfilename.Enabled = False
            Me.loc.Enabled = False
            Me.BackgroundWorker1.RunWorkerAsync()
        Else

            MessageBox.Show("Der Download ist nicht verfügbar", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning)
        End If
    End Sub
    Private Sub Downloadzeit()
        Timer1.Start()
    End Sub
    Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
        Dim theResponse As HttpWebResponse
        Dim theRequest As HttpWebRequest
        Try
            theRequest = WebRequest.Create(Me.txtfilename.Text)
            theResponse = theRequest.GetResponse
        Catch ex As Exception
            MessageBox.Show("An error occurred while downloading file. Possibe causes:" & ControlChars.CrLf & _
                            "1) File doesn't exist" & ControlChars.CrLf & _
                            "2) Remote server error", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
            Dim cancelDelegate As New DownloadCompleteSafe(AddressOf DownloadComplete)
            Me.Invoke(cancelDelegate, True)
            Exit Sub
        End Try
        Dim length As Long = theResponse.ContentLength
        Dim safedelegate As New ChangeTextsSafe(AddressOf ChangeTexts)
        Me.Invoke(safedelegate, length, 0, 0, 0)
        Dim writeStream As New IO.FileStream(Me.whereToSave, IO.FileMode.Create)
        Dim nRead As Integer
        Dim speedtimer As New Stopwatch
        Dim currentspeed As Double = -1
        Dim readings As Integer = 0

        Do
            If BackgroundWorker1.CancellationPending Then
                Exit Do
            End If
            speedtimer.Start()
            Dim readBytes(4095) As Byte
            Dim bytesread As Integer = theResponse.GetResponseStream.Read(readBytes, 0, 4096)
            nRead += bytesread
            Dim percent As Short = (nRead / length) * 100
            Me.Invoke(safedelegate, length, nRead, percent, currentspeed)

            If bytesread = 0 Then Exit Do
            writeStream.Write(readBytes, 0, bytesread)
            speedtimer.Stop()
            readings += 1

            If readings >= 5 Then
                currentspeed = 20480 / (speedtimer.ElapsedMilliseconds / 1000)
                speedtimer.Reset()
                readings = 0
            End If
        Loop

        theResponse.GetResponseStream.Close()
        writeStream.Close()

        If Me.BackgroundWorker1.CancellationPending Then
            IO.File.Delete(Me.whereToSave)
            Dim cancelDelegate As New DownloadCompleteSafe(AddressOf DownloadComplete)
            Me.Invoke(cancelDelegate, True)
            Exit Sub
        End If

        Dim completeDelegate As New DownloadCompleteSafe(AddressOf DownloadComplete)
        Me.Invoke(completeDelegate, False)
    End Sub

    Private Sub PictureBox1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PictureBox1.Click
        BackgroundWorker1.WorkerSupportsCancellation = True
        BackgroundWorker1.CancelAsync()
        PictureBox1.Visible = False
        PictureBox3.Visible = True
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        BackgroundWorker1.WorkerSupportsCancellation = True
        BackgroundWorker1.CancelAsync()
        Me.Close()
    End Sub

    Private Sub PictureBox3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PictureBox3.Click
    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        Try
            sek += 1
            If sek > 3 Then
                Dim zeitproeinheit As Double = sek / ProgressBar1.Value
                Dim nochzumachen As Integer = 100 - ProgressBar1.Value
                Dim min As Long = 0
                Dim zeit As Integer = nochzumachen * zeitproeinheit
                If zeit > 60 Then
                    Do Until zeit < 60
                        zeit -= 60
                        min += 1
                    Loop
                End If
                If zeit < 10 Then
                    Label1.Text = min & " Minuten , " & zeit & " Sekunden verbleiben"
                Else
                    Label1.Text = min & " Minuten , " & zeit & " Sekunden verbleiben"
                End If
            Else
                Label1.Text = "Restzeit wird berechnet..."
            End If
        Catch
        End Try
    End Sub
End Class