[VB.NET] Belajar Membuat Program File Scanner

Alhamdulillah, ini adalah postingan pertama saya setelah 1 minggu vakum setelah UN. Sebenarnya UN nya sudah selesai 1 minggu yang lalu, tetapi saya baru menyempatkan posting sekarang. Oke daripada kebanyakan omong, kita mulai saja rapat kali ini ^_^. Sebelumnya saya pernah mempostingkan bagaimana cara membuat Program Virus Scanner Sederhana, tetapi ternyata metode scan nya sangatlah lambat dan merepotkan. Nah kali ini saya akan membuat Program File Scanner yang mana metodenya lumanyan lebih cepat dan tidak memberatkan RAM. Mari kita lihat bagaimana?.



Buatlah proyek baru dengan 1 Form

Deklarasi:
1 Form
2 Button
2 TextBox
1 ComboBox
5 Label
1 Timer

Buatlah sedemikian rupa seperti ini sesuai keterangan dibawahnya:

Keterangan
1: ComboBox
 Name: cboDir
 DropDownStyle: DropDownList
2: Button
 Name: cmdBrowse
 Text: "Browse"
3: Button
 Name: cmdScan
 Text: "Scan"
4: TextBox
 Name: txtCurrDir
 MultiLine: True
 ScrollBars: Vertical
5: Label
 Name: lblSpeed
 Text: "Speed:"
6: TextBox
 Name: txtCurrFile
7: Label
 Name: lblScanned
 Text: "Scanned:"
8: Label
 Name: lblUnscanned
 Text: "Unscanned:"
9: Label
 Name: Label1
 Text: "Current Folder"
10: Label
 Name: Label2
 Text: "Current File"
11: Timer
 Name: tmrSpeedo
 Enabled: False
 Interval: 1000

Terakhir masukkan source codenya:

Source Code Form1

' Program file scanner sederhana
' coded by nurkholish ardi f
' www.cr0wja.co.cc
Imports Microsoft.VisualBasic.FileSystem
Imports Microsoft.VisualBasic.Strings
Public Class Form1

    Dim Scanned As UInt64
    Dim Unscanned As UInt64
    Dim ScannedBefore As UInt64
    Dim RunScan As Boolean

    Private Sub cmdScan_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdScan.Click
        If cboDir.Text = "" Then Exit Sub
        If cmdScan.Text = "Scan" Then
            Turn(True)
            ScanDir(cboDir.Text, True)
            If cmdScan.Text = "Stop" Then ShowRes()
        Else
            ShowRes()
        End If
        Turn(False)
    End Sub

    Private Sub Turn(ByVal switch As Boolean)
        Scanned = 0
        Unscanned = 0
        ScannedBefore = 0
        tmrSpeedo.Enabled = switch
        RunScan = switch
        txtCurrDir.Text = ""
        txtCurrFile.Text = ""
        lblScanned.Text = "Scanned: "
        lblSpeed.Text = "Speed: "
        cmdBrowse.Enabled = Not switch
        cboDir.Enabled = Not switch
        If switch Then
            cmdScan.Text = "Stop"
        Else
            cmdScan.Text = "Scan"
        End If
    End Sub

    Private Sub ShowRes()
        MsgBox("Done, " & Scanned & " file(s) scanned, " & Unscanned & " file(s) unscanned", MsgBoxStyle.Information, "Done")
    End Sub

    Private Sub cmdBrowse_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdBrowse.Click
        Dim OpenDirDlg As New FolderBrowserDialog
        With OpenDirDlg
            .ShowDialog()
            If .SelectedPath <> Nothing Then
                cboDir.Items.Add(.SelectedPath)
                cboDir.Text = .SelectedPath
            End If
        End With
        OpenDirDlg = Nothing
    End Sub

    Private Sub ScanDir(ByVal dirpath As String, ByVal subdirs As Boolean)
        If Not RunScan Then Exit Sub
        Application.DoEvents()
        If Strings.Right(dirpath, 1) <> "\" Then dirpath &= "\"
        Dim CurrFile As String
        Dim value As Int32
        CurrFile = Microsoft.VisualBasic.Dir(dirpath)
        Do While CurrFile <> ""
            value = ScanFile(dirpath & CurrFile)
            Scanned += value
            Unscanned += IIf(value = 1, 0, 1)
            txtCurrFile.Text = CurrFile
            txtCurrDir.Text = dirpath
            lblScanned.Text = "Scanned: " & Scanned & " file(s)"
            lblUnscanned.Text = "Unscanned: " & Unscanned & " file(s)"
            CurrFile = Microsoft.VisualBasic.Dir
        Loop

        If subdirs Then
            For Each SubDir As String In FileIO.FileSystem.GetDirectories(dirpath, FileIO.SearchOption.SearchTopLevelOnly)
                Try
                    ScanDir(SubDir, True)
                Catch ex As Exception

                End Try
            Next
        End If
    End Sub

    Private Function ScanFile(ByVal filepath As String) As Int32
        If Not RunScan Then Exit Function
        Application.DoEvents()
        Try
            Dim OpenFile As New IO.StreamReader(filepath)
            '==========================================
            ' Disini agan bisa menambahkan code yang selanjutnya, setelah akses stream file reader terbuka
            ' bisa berupa mencari bit pada file, mendapatkan hash md5 nya atau sebagainya
            ' sesuai keinginan agan
            '==========================================
            OpenFile.Close()
            Return 1
        Catch ex As Exception
            ' jika terjadi error
            Return 0
        End Try
    End Function

    Private Sub tmrSpeedo_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tmrSpeedo.Tick
        If ScannedBefore = 0 Then
            ScannedBefore = Scanned
        Else
            lblSpeed.Text = "Speed: " & (Scanned - ScannedBefore) & " file/s"
            ScannedBefore = Scanned
        End If
    End Sub

End Class

Dan setelah saya coba Run, kecepatan scan nya lumayan nih.

Tetapi itu belum ada code yang akan dijalankan pada setiap file yang akan di scan, mungkin jika agan menambahkan code seperti mengambil hash MD5 nya mungkin kecepatan akan semakin lambat tergantung banyaknya tugas yang dilaksanakan.

Nah, sampai sekian dulu. Seperti biasanya jika agan malas membuatnya, agan bisa mendownload source codenya dibawah ini.