'Where the program save the file 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 ) Public Sub DownloadComplete ( ByVal cancelled As Boolean ) Me . txtFileName . Enabled = True Me . btnDownload . Enabled = True Me . btnCancel . Enabled = False If cancelled Then Me . Label4 . Text = "Cancelled" 'MessageBox.Show("Download aborted", "Aborted", MessageBoxButtons.OK, MessageBoxIcon.Information) Else Me . Label4 . Text = "Successfully downloaded" 'MessageBox.Show("Successfully downloaded!", "All OK", MessageBoxButtons.OK, MessageBoxIcon.Information) End If Me . ProgressBar1 . Value = 0 Me . Label5 . Text = "Downloading: " Me . Label6 . Text = "Save to: " Me . Label3 . Text = "File size: " Me . Label2 . Text = "Download speed: " Me . Label4 . Text = "" End Sub Public Sub ChangeTexts ( ByVal length As Long , ByVal position As Integer , ByVal percent As Integer , ByVal speed As Double ) Me . Label3 . Text = "File size: " & Math. Round ( ( length / 1024 ) , 2 ) & " KB" Me . Label5 . Text = "Downloading: " & Me . txtFileName . Text Me . Label4 . Text = "Downloaded " & Math. Round ( ( position / 1024 ) , 2 ) & " KB of " & Math. Round ( ( length / 1024 ) , 2 ) & "KB (" & Me . ProgressBar1 . Value & "%)" If speed = - 1 Then Me . Label2 . Text = "Download speed: calculating..." Else Me . Label2 . Text = "Download speed: " & Math. Round ( ( speed / 1024 ) , 2 ) & " KB/s" End If Me . ProgressBar1 . Value = percent End Sub Private Sub btnDownload_Click ( ByVal sender As System. Object , ByVal e As System. EventArgs ) Handles btnDownload. Click If Me . txtFileName . Text <> "" AndAlso Me . txtFileName . Text . StartsWith ( "http://" ) Then Me . SaveFileDialog1 . FileName = Me . txtFileName . Text . Split ( "/" c ) ( Me . txtFileName . Text . Split ( "/" c ) . Length - 1 ) If Me . SaveFileDialog1 . ShowDialog = Windows. Forms . DialogResult . OK Then Me . whereToSave = Me . SaveFileDialog1 . FileName Me . SaveFileDialog1 . FileName = "" Me . Label6 . Text = "Save to: " & Me . whereToSave Me . txtFileName . Enabled = False Me . btnDownload . Enabled = False Me . btnCancel . Enabled = True Me . BackgroundWorker1 . RunWorkerAsync ( ) 'Start download End If Else MessageBox. Show ( "Please insert valid URL for download" , "Warning" , MessageBoxButtons. OK , MessageBoxIcon. Warning ) End If End Sub Private Sub btnCancel_Click ( ByVal sender As System. Object , ByVal e As System. EventArgs ) Handles btnCancel. Click Me . BackgroundWorker1 . CancelAsync ( ) 'Send cancel request Try Me . bckZip . CancelAsync ( ) Catch ex As Exception 'Do Nothing End Try End Sub Private Sub BackgroundWorker1_DoWork ( ByVal sender As System. Object , ByVal e As System. ComponentModel . DoWorkEventArgs ) Handles BackgroundWorker1. DoWork 'Creating the request and getting the response Dim theResponse As HttpWebResponse Dim theRequest As HttpWebRequest Try 'Checks if the file exist theRequest = WebRequest. Create ( Me . txtFileName . Text ) theResponse = theRequest. GetResponse theRequest. Timeout = 10000000 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 'Size of the response (in bytes) Dim safedelegate As New ChangeTextsSafe ( AddressOf ChangeTexts ) Me . Invoke ( safedelegate, length, 0 , 0 , 0 ) 'Invoke the TreadsafeDelegate Dim writeStream As New IO. FileStream ( Me . whereToSave , IO. FileMode . Create ) 'Replacement for Stream.Position (webResponse stream doesn't support seek) Dim nRead As Integer 'To calculate the download speed Dim speedtimer As New Stopwatch Dim currentspeed As Double = - 1 Dim readings As Integer = 0 Do If BackgroundWorker1. CancellationPending Then 'If user abort download Exit Do End If speedtimer. Start ( ) Dim readBytes ( 4096 ) As Byte Dim bytesread As Integer = theResponse. GetResponseStream . Read ( readBytes, 0 , 4096 ) nRead += bytesread Dim percent As Integer = ( 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 'For increase precision, the speed it's calculated only every five cicles currentspeed = 20480 / ( speedtimer. ElapsedMilliseconds / 1000 ) speedtimer. Reset ( ) readings = 0 End If Loop 'Close the streams 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 Dim whereToSave As String "Jeigu programa išsaugoti failą atstovas subrangos ChangeTextsSafe (ByVal ilgis As Long, ByVal pozicija As Integer, ByVal proc As Integer, ByVal greitis kaip dvigubas) Atstovas pagal subrangos DownloadCompleteSafe (ByVal panaikinami Būlio) Public Sub DownloadComplete (ByVal atšauktas Kaip loginis) Me. txtFileName. Įjungta = True mane. btnDownload. Įjungta = True mane. btnCancel. Įjungta = false, jei atšauktas Tada mane. Label4. Tekstas = "Atšaukti" "MessageBox.Show (" Download nutrauktas "," Pertrauka ", MessageBoxButtons.OK, MessageBoxIcon.Information) kita mane. Label4. Tekstas = "sėkmingai parsisiųsti" "MessageBox.Show (" sėkmingai parsisiųsti! "," Visi OK ", MessageBoxButtons.OK, MessageBoxIcon.Information) End If mane. ProgressBar1. vertė = 0 Me. Label5. Tekstas = "Atsisiųsti" Me. Label6. Tekstas = "Įrašyti į" Me. Label3. Tekstas = "Failo dydis:" Aš. Label2. Tekstas = "Atsisiųsti greitis:" Aš. Label4. Tekstas = "" End Sub Public Sub ChangeTexts (ByVal ilgis As Long, ByVal pozicija As Integer, ByVal proc As Integer, ByVal greitis kaip dvigubas) Me. Label3. Tekstas = "Failo dydis:" & Math. Round ((ilgis / 1024) , 2) ir "KB" Me. Label5. Tekstas = "Atsisiųsti" ir mane. txtFileName. Tekstas mane. Label4. Tekstas = "paimti" & Math. Round ((pareigos / 1024), 2) ir "KB" & Math. Round ((ilgis / 1024), 2) ir "KB (" & Me. ProgressBar1. Vertės ir "%)" Jei greitis = - 1 Tada mane. Label2. Tekstas = "Atsisiųsti greitis: apskaičiuoti ..." kita mane. Label2. Tekstas = "Atsisiųsti greitis:" & Math. Round ((greitis / 1024), 2) ir "KB / s" End If mane. ProgressBar1. vertė = procentai End Sub Private Sub btnDownload_Click (ByVal siuntėjas, sistemos . Objektų, ByVal e kaip sistema. EventArgs) Rankenos btnDownload. spustelėkite, jei mane. txtFileName. tekstą <> "" AndAlso mane. txtFileName. tekstą. startswith ("http://") Tada mane. SaveFileDialog1. filename = Me. txtFileName . Tekstas. Split ("/" c) (Me. txtFileName. tekstą. Split ("/" c). Ilgis - 1) Jei mane. SaveFileDialog1. ShowDialog = Windows. formas. DialogResult. Gerai, tada mane. whereToSave = Me. SaveFileDialog1. FileName mane. SaveFileDialog1. filename = "" Me. Label6. Tekstas = "Įrašyti į" & Me. whereToSave mane. txtFileName. Įjungta = False mane. btnDownload. Įjungta = False mane. btnCancel. Įjungta = True mane. BackgroundWorker1 . RunWorkerAsync () "Pradėti siuntimą End If kita MessageBox. Show (" Prašome įrašyti teisingą URL atsisiųsti "," Įspėjimas ", MessageBoxButtons. Gerai, MessageBoxIcon. Perspėjimas) End If End Sub Private Sub btnCancel_Click (ByVal siuntėjas, sistemos. Objektų, ByVal e kaip sistema. EventArgs) Rankenos btnCancel. Click Me. BackgroundWorker1. CancelAsync () "Siųsti atšaukti prašymą Try Me. bckZip. CancelAsync () Catch ex Kaip išimtis" Ar Nothing End Try End Sub Private Sub BackgroundWorker1_DoWork (ByVal siuntėjas, sistemos. Objektas, ByVal e kaip sistema. ComponentModel. DoWorkEventArgs) Rankenos BackgroundWorker1. DoWork "kūrimas prašymą ir gauti atsakymą Dim theResponse Kaip HttpWebResponse Dim theRequest Kaip HttpWebRequest Pabandykite" patikrina, ar failas egzistuoja theRequest = WebRequest. vnt (Me. txtFileName. Text) theResponse = theRequest. getResponse theRequest. timeout = 10000000 Catch ex Kaip išimtis MessageBox. Show ("Klaida siunčiant bylą. Possibe priežastis:" & ControlChars. Crlf & _ "1) Byla neegzistuoja" ir ControlChars. Crlf & _ "2) nuotolinio serverio klaida", "Klaida", MessageBoxButtons. Gerai, MessageBoxIcon. klaida) Dim cancelDelegate Kaip Naujas DownloadCompleteSafe (AddressOf DownloadComplete) Me. Invoke (cancelDelegate, True) Exit Sub End Try Dim ilgis As Long = theResponse. ContentLength "Dydis atsako (baitų) Dim safedelegate Kaip Naujas ChangeTextsSafe (AddressOf ChangeTexts) Me. Invoke (safedelegate, ilgis, 0, 0, 0)" remtis TreadsafeDelegate Dim writeStream Kaip Naujas IO. FileStream (Me. whereToSave, IO. FileMode. vnt) "pakeitimas, skirtas Stream.Position (webResponse srautas nepalaiko ieškoti) Dim nRead As Integer" Norint apskaičiuoti atsisiuntimo greitis Dim speedtimer Kaip Naujas Chronometras Dim currentspeed kaip dvigubas = - 1 Dim rodmenys As Integer = 0 Ar Jei BackgroundWorker1 . CancellationPending Tada "Jei vartotojas nutraukti parsisiųsti Uždaryti Ar End If speedtimer. start () Dim readBytes (4096) Kaip Baitas Dim bytesread As Integer = theResponse. GetResponseStream. Skaityti (readBytes, 0, 4096) nRead + = bytesread Dim proc As Integer = (nRead / ilgis) * 100 Me. Invoke (safedelegate, ilgis, nRead, proc currentspeed) Jei bytesread = 0 išeikite Ar writeStream. Write (readBytes, 0, bytesread) speedtimer. stop () rodmenis + = 1 Jei rodmenys> = 5 Tada "Dėl padidinti tikslumą, greitį jis skaičiuojamas tik kartą per penkerius cicles currentspeed = 20480 / (speedtimer. ElapsedMilliseconds / 1000) speedtimer. reset () rodmenis = 0 End If Ciklas" Uždaryti srautų theResponse. GetResponseStream. Uždaryti () writeStream . Uždaryti () Jei mane. BackgroundWorker1. CancellationPending Tada IO. failą. Ištrinti (Me. whereToSave) Dim cancelDelegate Kaip Naujas DownloadCompleteSafe (AddressOf DownloadComplete) Me. Invoke (cancelDelegate, True) Exit Sub End If Dim completeDelegate Kaip Naujas DownloadCompleteSafe (AddressOf DownloadComplete ) Me. Invoke (completeDelegate, False) End Sub