Imports System
Imports System.Windows.Forms
Imports System.IO
Imports System.Text.RegularExpressions
Imports System.Collections.Specialized
Public Class MainClass
Shared Sub Main()
Dim myform As Form = New FrmFileSearch()
Application.Run(myform)
End Sub ' Main
End Class
Public Class FrmFileSearch
Inherits Form
' label that displays current directory
Friend WithEvents lblDirectory As Label
' label that displays directions to user
Friend WithEvents lblDirections As Label
' button that activates search
Friend WithEvents cmdSearch As Button
' text boxes for inputting and outputting data
Friend WithEvents txtInput As TextBox
Friend WithEvents txtOutput As TextBox
#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.Container
'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.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.txtOutput = New System.Windows.Forms.TextBox()
Me.lblDirections = New System.Windows.Forms.Label()
Me.lblDirectory = New System.Windows.Forms.Label()
Me.txtInput = New System.Windows.Forms.TextBox()
Me.cmdSearch = New System.Windows.Forms.Button()
Me.SuspendLayout()
'
'txtOutput
'
Me.txtOutput.AutoSize = False
Me.txtOutput.BackColor = System.Drawing.SystemColors.Control
Me.txtOutput.Location = New System.Drawing.Point(20, 276)
Me.txtOutput.Multiline = True
Me.txtOutput.Name = "txtOutput"
Me.txtOutput.ReadOnly = True
Me.txtOutput.ScrollBars = System.Windows.Forms.ScrollBars.Vertical
Me.txtOutput.Size = New System.Drawing.Size(461, 208)
Me.txtOutput.TabIndex = 4
Me.txtOutput.Text = ""
'
'lblDirections
'
Me.lblDirections.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
Me.lblDirections.Location = New System.Drawing.Point(20, 138)
Me.lblDirections.Name = "lblDirections"
Me.lblDirections.Size = New System.Drawing.Size(451, 20)
Me.lblDirections.TabIndex = 1
Me.lblDirections.Text = "Enter Path to Search:"
'
'lblDirectory
'
Me.lblDirectory.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.0!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
Me.lblDirectory.Location = New System.Drawing.Point(20, 20)
Me.lblDirectory.Name = "lblDirectory"
Me.lblDirectory.Size = New System.Drawing.Size(451, 98)
Me.lblDirectory.TabIndex = 0
Me.lblDirectory.Text = "Current Directory:"
'
'txtInput
'
Me.txtInput.Location = New System.Drawing.Point(20, 168)
Me.txtInput.Name = "txtInput"
Me.txtInput.Size = New System.Drawing.Size(461, 22)
Me.txtInput.TabIndex = 3
Me.txtInput.Text = ""
'
'cmdSearch
'
Me.cmdSearch.Font = New System.Drawing.Font("Microsoft Sans Serif", 9.75!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
Me.cmdSearch.Location = New System.Drawing.Point(20, 217)
Me.cmdSearch.Name = "cmdSearch"
Me.cmdSearch.Size = New System.Drawing.Size(461, 40)
Me.cmdSearch.TabIndex = 2
Me.cmdSearch.Text = "Search Directory"
'
'FrmFileSearch
'
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
Me.ClientSize = New System.Drawing.Size(501, 499)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.txtOutput, Me.txtInput, Me.cmdSearch, Me.lblDirections, Me.lblDirectory})
Me.Name = "FrmFileSearch"
Me.Text = "Using Regular Expressions"
Me.ResumeLayout(False)
End Sub
#End Region
Dim currentDirectory As String = Directory.GetCurrentDirectory
Dim directoryList As String()
Dim fileArray As String()
Dim found As NameValueCollection = New NameValueCollection()
Private Sub txtInput_KeyDown(ByVal sender As System.Object, _
ByVal e As System.Windows.Forms.KeyEventArgs) _
Handles txtInput.KeyDown
If (e.KeyCode = Keys.Enter) Then
cmdSearch_Click(sender, e)
End If
End Sub
Private Sub cmdSearch_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles cmdSearch.Click
Dim current As String
If txtInput.Text <> "" Then
' verify that user input is a valid directory name
If Directory.Exists(txtInput.Text) Then
currentDirectory = txtInput.Text
' reset input text box and update display
lblDirectory.Text = "Current Directory:" & vbCrLf & _
currentDirectory
' show error if user does not specify valid directory
Else
MessageBox.Show("Invalid Directory", "Error", _
MessageBoxButtons.OK, MessageBoxIcon.Error)
Return
End If
End If
' clear text boxes
txtInput.Text = ""
txtOutput.Text = ""
' search directory
SearchDirectory(currentDirectory)
' summarize and print results
For Each current In found
txtOutput.Text &= "* Found " & found(current) & " " _
& current & " files." & vbCrLf
Next
' clear output for new search
found.Clear()
End Sub ' cmdSearch_Click
' search directory using regular expression
Private Sub SearchDirectory(ByVal currentDirectory As String)
' for file name without directory path
Try
Dim fileName As String = ""
Dim myFile As String
Dim myDirectory As String
' regular expression for extensions matching pattern
Dim regularExpression As Regex = _
New Regex("([a-zA-Z0-9]+\.(?<extension>\w+))")
' stores regular-expression-match result
Dim matchResult As Match
Dim fileExtension As String ' holds file extensions
' number of files with given extension in directory
Dim extensionCount As Integer
' get directories
directoryList = _
Directory.GetDirectories(currentDirectory)
' get list of files in current directory
fileArray = Directory.GetFiles(currentDirectory)
' iterate through list of files
For Each myFile In fileArray
fileName = myFile.Substring( _
myFile.LastIndexOf("\") + 1)
matchResult = regularExpression.Match(fileName)
If (matchResult.Success) Then
fileExtension = matchResult.Result("${extension}")
Else
fileExtension = "[no extension]"
End If
If (found(fileExtension) = Nothing) Then
found.Add(fileExtension, "1")
Else
extensionCount = _
Convert.ToInt32(found(fileExtension)) + 1
found(fileExtension) = extensionCount.ToString()
End If
Next
For Each myDirectory In directoryList
SearchDirectory(myDirectory)
Next
Catch unauthorizedAccess As UnauthorizedAccessException
MessageBox.Show("Some files may not be visible due to" _
& " permission settings", "Warning", _
MessageBoxButtons.OK, MessageBoxIcon.Information)
End Try
End Sub
End Class
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