Sample Code, Program Examples for Developers - C#, VB.Net, ASP.Net and more

Iterating through all folders.
Language(s):
VB.Net
Category(s):
Recursion
Author: Jon Vote
Published: Tuesday, July 30, 2002
How to recursively iterate through all folders on the computer.
'VB.Net Example - How to recursively iterate through all folders on the computer.. 
'
'
'(c) Jon Vote 07/2002
'
'Idioma Software Inc. 
'www.idioma-software.com
'jon@idioma-software.com 
'
'This example may be freely used in code 
'as long as credit is given to the author. 
'No publication is authorized. 
'
'Code is presented as is. 
'User assumes all responsibility

'1) Start a new VB.Net project. Form1 is created by default. 
'2) Press F7 to bring up the code window. 
'3) Replace all (some? no all!) of the code in the code window 
'   with the following:
'

'VB.Net Example - How to recursively iterate through all folders on the computer.. 
'
'
'(c) Jon Vote 07/2002
'
'Idioma Software Inc. 
'www.idioma-software.com
'jon@idioma-software.com 
'
'This example may be freely used in code 
'as long as credit is given to the author. 
'No publication is authorized. 
'
'Code is presented as is. 
'User assumes all responsibility

Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents btnGo As System.Windows.Forms.Button
    Friend WithEvents txtStartWith As System.Windows.Forms.TextBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents grpIncludeAttributes As System.Windows.Forms.GroupBox
    Friend WithEvents chkArchive As System.Windows.Forms.CheckBox
    Friend WithEvents chkDirectory As System.Windows.Forms.CheckBox
    Friend WithEvents chkHidden As System.Windows.Forms.CheckBox
    Friend WithEvents chkNormal As System.Windows.Forms.CheckBox
    Friend WithEvents chkVolume As System.Windows.Forms.CheckBox
    Friend WithEvents chkSystem As System.Windows.Forms.CheckBox
    Friend WithEvents chkReadOnly As System.Windows.Forms.CheckBox
    Friend WithEvents lblOutput As System.Windows.Forms.Label
    Friend WithEvents chkIncludeSubFolders As System.Windows.Forms.CheckBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.btnGo = New System.Windows.Forms.Button()
        Me.txtStartWith = New System.Windows.Forms.TextBox()
        Me.Label1 = New System.Windows.Forms.Label()
        Me.grpIncludeAttributes = New System.Windows.Forms.GroupBox()
        Me.chkVolume = New System.Windows.Forms.CheckBox()
        Me.chkSystem = New System.Windows.Forms.CheckBox()
        Me.chkReadOnly = New System.Windows.Forms.CheckBox()
        Me.chkNormal = New System.Windows.Forms.CheckBox()
        Me.chkHidden = New System.Windows.Forms.CheckBox()
        Me.chkDirectory = New System.Windows.Forms.CheckBox()
        Me.chkArchive = New System.Windows.Forms.CheckBox()
        Me.lblOutput = New System.Windows.Forms.Label()
        Me.chkIncludeSubFolders = New System.Windows.Forms.CheckBox()
        Me.grpIncludeAttributes.SuspendLayout()
        Me.SuspendLayout()
        '
        'btnGo
        '
        Me.btnGo.Location = New System.Drawing.Point(12, 176)
        Me.btnGo.Name = "btnGo"
        Me.btnGo.TabIndex = 0
        Me.btnGo.Text = "Go"
        '
        'txtStartWith
        '
        Me.txtStartWith.Location = New System.Drawing.Point(68, 8)
        Me.txtStartWith.Name = "txtStartWith"
        Me.txtStartWith.Size = New System.Drawing.Size(272, 20)
        Me.txtStartWith.TabIndex = 1
        Me.txtStartWith.Text = "c:\"
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(4, 12)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(60, 12)
        Me.Label1.TabIndex = 2
        Me.Label1.Text = "Start With:"
        '
        'grpIncludeAttributes
        '
        Me.grpIncludeAttributes.Controls.AddRange(New System.Windows.Forms.Control() {Me.chkVolume, Me.chkSystem, Me.chkReadOnly, Me.chkNormal, Me.chkHidden, Me.chkDirectory, Me.chkArchive})
        Me.grpIncludeAttributes.Location = New System.Drawing.Point(8, 41)
        Me.grpIncludeAttributes.Name = "grpIncludeAttributes"
        Me.grpIncludeAttributes.Size = New System.Drawing.Size(340, 124)
        Me.grpIncludeAttributes.TabIndex = 3
        Me.grpIncludeAttributes.TabStop = False
        Me.grpIncludeAttributes.Text = "Include Attributes"
        '
        'chkVolume
        '
        Me.chkVolume.Checked = True
        Me.chkVolume.CheckState = System.Windows.Forms.CheckState.Checked
        Me.chkVolume.Location = New System.Drawing.Point(184, 72)
        Me.chkVolume.Name = "chkVolume"
        Me.chkVolume.Size = New System.Drawing.Size(128, 20)
        Me.chkVolume.TabIndex = 6
        Me.chkVolume.Text = "Volume"
        '
        'chkSystem
        '
        Me.chkSystem.Checked = True
        Me.chkSystem.CheckState = System.Windows.Forms.CheckState.Checked
        Me.chkSystem.Location = New System.Drawing.Point(184, 48)
        Me.chkSystem.Name = "chkSystem"
        Me.chkSystem.Size = New System.Drawing.Size(128, 20)
        Me.chkSystem.TabIndex = 5
        Me.chkSystem.Text = "System"
        '
        'chkReadOnly
        '
        Me.chkReadOnly.Checked = True
        Me.chkReadOnly.CheckState = System.Windows.Forms.CheckState.Checked
        Me.chkReadOnly.Location = New System.Drawing.Point(184, 24)
        Me.chkReadOnly.Name = "chkReadOnly"
        Me.chkReadOnly.Size = New System.Drawing.Size(128, 20)
        Me.chkReadOnly.TabIndex = 4
        Me.chkReadOnly.Text = "ReadOnly"
        '
        'chkNormal
        '
        Me.chkNormal.Checked = True
        Me.chkNormal.CheckState = System.Windows.Forms.CheckState.Checked
        Me.chkNormal.Location = New System.Drawing.Point(24, 96)
        Me.chkNormal.Name = "chkNormal"
        Me.chkNormal.Size = New System.Drawing.Size(128, 20)
        Me.chkNormal.TabIndex = 3
        Me.chkNormal.Text = "Normal"
        '
        'chkHidden
        '
        Me.chkHidden.Checked = True
        Me.chkHidden.CheckState = System.Windows.Forms.CheckState.Checked
        Me.chkHidden.Location = New System.Drawing.Point(24, 72)
        Me.chkHidden.Name = "chkHidden"
        Me.chkHidden.Size = New System.Drawing.Size(128, 20)
        Me.chkHidden.TabIndex = 2
        Me.chkHidden.Text = "Hidden"
        '
        'chkDirectory
        '
        Me.chkDirectory.Checked = True
        Me.chkDirectory.CheckState = System.Windows.Forms.CheckState.Checked
        Me.chkDirectory.Location = New System.Drawing.Point(24, 48)
        Me.chkDirectory.Name = "chkDirectory"
        Me.chkDirectory.Size = New System.Drawing.Size(128, 20)
        Me.chkDirectory.TabIndex = 1
        Me.chkDirectory.Text = "Directory"
        '
        'chkArchive
        '
        Me.chkArchive.Checked = True
        Me.chkArchive.CheckState = System.Windows.Forms.CheckState.Checked
        Me.chkArchive.Location = New System.Drawing.Point(24, 24)
        Me.chkArchive.Name = "chkArchive"
        Me.chkArchive.Size = New System.Drawing.Size(128, 20)
        Me.chkArchive.TabIndex = 0
        Me.chkArchive.Text = "Archive"
        '
        'lblOutput
        '
        Me.lblOutput.Anchor = ((System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right)
        Me.lblOutput.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.lblOutput.Location = New System.Drawing.Point(0, 208)
        Me.lblOutput.Name = "lblOutput"
        Me.lblOutput.Size = New System.Drawing.Size(352, 20)
        Me.lblOutput.TabIndex = 4
        '
        'chkIncludeSubFolders
        '
        Me.chkIncludeSubFolders.Checked = True
        Me.chkIncludeSubFolders.CheckState = System.Windows.Forms.CheckState.Checked
        Me.chkIncludeSubFolders.Location = New System.Drawing.Point(104, 176)
        Me.chkIncludeSubFolders.Name = "chkIncludeSubFolders"
        Me.chkIncludeSubFolders.Size = New System.Drawing.Size(208, 16)
        Me.chkIncludeSubFolders.TabIndex = 5
        Me.chkIncludeSubFolders.Text = "Include Sub-Folders"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(352, 229)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.chkIncludeSubFolders, Me.lblOutput, Me.grpIncludeAttributes, Me.Label1, Me.txtStartWith, Me.btnGo})
        Me.Name = "Form1"
        Me.Text = "Iterate Directories Example - www.skycoder.com"
        Me.grpIncludeAttributes.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub btnGo_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGo.Click
        System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.WaitCursor
        Try
            CheckCheckBoxes()
            IterateDirectory(txtStartWith.Text)
        Catch
            MsgBox(Err.Description)
        End Try
        System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.Default
    End Sub

    Private Sub IterateDirectory(ByVal strPath As String)

        Dim atrIncludeThese As FileAttribute
        Dim strName As String
        Dim i As Integer

        'Set the attributes for which we are searching
        If chkArchive.Checked Then
            atrIncludeThese = atrIncludeThese + FileAttribute.Archive
        End If
        If chkDirectory.Checked Then
            atrIncludeThese = atrIncludeThese + FileAttribute.Directory
        End If
        If chkHidden.Checked Then
            atrIncludeThese = atrIncludeThese + FileAttribute.Hidden
        End If
        If chkNormal.Checked Then
            atrIncludeThese = atrIncludeThese + FileAttribute.Normal
        End If
        If chkReadOnly.Checked Then
            atrIncludeThese = atrIncludeThese + FileAttribute.ReadOnly
        End If
        If chkSystem.Checked Then
            atrIncludeThese = atrIncludeThese + FileAttribute.System
        End If
        If chkVolume.Checked Then
            atrIncludeThese = atrIncludeThese + FileAttribute.Volume
        End If

        'Iterate for each entry that matches 
        'the criteria
        strName = Dir$(strPath, atrIncludeThese)
        Do While strName <> ""
            strName = PutSlash(strPath) & strName
            PutStatus(strName)
            Debug.WriteLine(strName)
            strName = Dir$()
        Loop

        'Recurse for each subfolder
        'if we are searching sub-folders
        If chkIncludeSubFolders.Checked Then
            Dim colDirectories As New Collection()
            atrIncludeThese = FileAttribute.Directory
            If chkHidden.Checked Then
                atrIncludeThese = atrIncludeThese + FileAttribute.Hidden
            End If
            If chkSystem.Checked Then
                atrIncludeThese = atrIncludeThese + FileAttribute.System
            End If
            'Iterate for each folder
            strName = Dir$(strPath, FileAttribute.Directory)
            If strName <> "" Then
                Do While strName <> ""
                    If GetAttr(PutSlash(strPath) & strName) = FileAttribute.Directory Then
                        colDirectories.Add(PutSlash(PutSlash(strPath) & strName))
                    End If
                    strName = Dir$()
                Loop
                For i = 1 To colDirectories.Count
                    IterateDirectory(colDirectories.Item(i))
                Next
            End If
        End If
    End Sub

    'CheckCheckBoxes: Checks chkNormal if nothing checked
    Private Sub CheckCheckBoxes()
        Dim x As Control
        Dim chkCheck As CheckBox
        Dim bOneChecked As Boolean

        For Each x In Me.Controls
            If TypeOf x Is CheckBox Then
                chkCheck = x
                If chkCheck.Checked Then
                    bOneChecked = True
                    Exit For
                End If
            End If
        Next

        If Not bOneChecked Then
            chkNormal.Checked = True
        End If
    End Sub

    'PutSlash: Insures there is a closing slash
    Private Function PutSlash(ByVal strPathName As String) As String
        PutSlash = IIf(Microsoft.VisualBasic.Right(strPathName, 1) = "\", strPathName, strPathName & "\")
    End Function

    Private Sub PutStatus(ByVal strPutThis As String)
        lblOutput.Text = strPutThis
        System.Windows.Forms.Application.DoEvents()
    End Sub

    Private Sub Form1_Closed(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Closed
        End
    End Sub

End Class
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The examples on this page are presented "as is". They may be used in code as long as credit is given to the original author. Contents of this page may not be reproduced or published in any other manner what so ever without written permission from Idioma Software Inc.