ZIP extraction with progress bar
Using ICSharpCode’s SharpZipLib, I kick off a background worker process (guess what I have been playing around with, lol) and extract ZIP files. Used in combination with my Downloader, it becomes pretty nifty if I may say so myself!
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | Delegate Sub zipProgressSafe(ByVal text As String, ByVal percent As Integer) Delegate Sub zipCompleteSafe(ByVal cancelled As Boolean) Dim extractDir As String = Application.StartupPath & "\extracted\" Private Sub bckZip_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles bckZip.DoWork Dim zipFilename As String = Me.whereToSave If File.Exists(zipFilename) Then Dim safedelegate As New zipProgressSafe(AddressOf zipProgress) Me.Invoke(safedelegate, "Start Unzipping Process...", 0) 'Invoke the TreadsafeDelegate Dim Redo As Integer = 1 Dim MyZipInputStream As ZipInputStream Dim MyFileStream As FileStream MyZipInputStream = New ZipInputStream(New FileStream(zipFilename, FileMode.Open, FileAccess.Read)) Dim MyZipEntry As ZipEntry = MyZipInputStream.GetNextEntry Directory.CreateDirectory(extractDir) Dim nRead, total As Integer Dim percent As Integer While Not MyZipEntry Is Nothing Me.Invoke(safedelegate, "Calculating ZIP File Size...", 0) total += 1 MyZipEntry = MyZipInputStream.GetNextEntry End While Me.Invoke(safedelegate, "Resetting ZIP File...", 0) MyZipInputStream = New ZipInputStream(New FileStream(zipFilename, FileMode.Open, FileAccess.Read)) MyZipEntry = MyZipInputStream.GetNextEntry Me.Invoke(safedelegate, "Start Unzipping file 1 of " & total.ToString, 0) While Not MyZipEntry Is Nothing If bckZip.CancellationPending Then 'If user abort download Exit While End If If (MyZipEntry.IsDirectory) Then Directory.CreateDirectory(extractDir & "\" & MyZipEntry.Name) Else If Not Directory.Exists(extractDir & "\" & Path.GetDirectoryName(MyZipEntry.Name)) Then Directory.CreateDirectory(extractDir & "\" & Path.GetDirectoryName(MyZipEntry.Name)) End If MyFileStream = New FileStream(extractDir & "\" & MyZipEntry.Name, FileMode.OpenOrCreate, FileAccess.Write) Dim count As Integer Dim buffer(4096) As Byte count = MyZipInputStream.Read(buffer, 0, 4096) While count > 0 MyFileStream.Write(buffer, 0, count) count = MyZipInputStream.Read(buffer, 0, 4096) End While MyFileStream.Close() End If nRead += 1 percent = ((nRead / total) * 100) Me.Invoke(safedelegate, "Start Unzipping file " & nRead.ToString & " of " & total.ToString, percent) Try MyZipEntry = MyZipInputStream.GetNextEntry Catch ex As Exception MyZipEntry = Nothing End Try End While If Not (MyZipInputStream Is Nothing) Then MyZipInputStream.Close() If Not (MyFileStream Is Nothing) Then MyFileStream.Close() If Me.bckZip.CancellationPending Then Dim cancelDelegate As New zipCompleteSafe(AddressOf zipComplete) Me.Invoke(cancelDelegate, True) Exit Sub End If Dim completeDelegate As New zipCompleteSafe(AddressOf zipComplete) Me.Invoke(completeDelegate, False) Else Dim cancelDelegate As New zipCompleteSafe(AddressOf zipComplete) Me.Invoke(cancelDelegate, True) Exit Sub End If End Sub Public Sub zipProgress(ByVal text As String, ByVal percent As Integer) Me.Label4.Text = text Me.ProgressBar1.Value = percent End Sub Public Sub zipComplete(ByVal cancelled As Boolean) If cancelled Then Me.Label4.Text = "Cancelled" Else Me.Label4.Text = "Successfully Unzipped" End If Me.ProgressBar1.Value = 0 End Sub |
Download File calculating speed and progress -Background Worker & Progress bar
Here is some code that will make use of VB.NET’s Backgroundworker class and initiate a web request to download a file. It will calculate the file’s speed as well as indicate it’s progress on a progress bar. All the while keeping the Main Form available.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | Dim whereToSave As String '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 |
