Find a file: search directory recursively : Directory « File Directory « VB.Net






  1. VB.Net
  2. File Directory
  3. Directory

Find a file: search directory recursively

 
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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13.Move the directory
14.Count the files in a directory
15.Calculate the size of a directory and its subdirectories and displays the total size in bytes.
16.Gets or sets the attributes for the current file or directory.
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20.Directory.Delete deletes an empty directory from a specified path.
21.Deletes the specified directory and subdirectories and files in the directory.
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24.Returns directory names that match a search pattern in a specified path, and optionally searches subdirectories.
25.Determines whether the given path refers to an existing directory on disk.
26.Gets the creation date and time of a directory.
27.Gets the creation date and time, in Coordinated Universal Time (UTC) format, of a directory.
28.Gets the current working directory of the application.
29.Gets the names of subdirectories in the specified directory.
30.Gets an array of directories matching the specified search pattern from the current directory.
31.Returns the names of files (including their paths) that match the specified search pattern in the specified directory.
32.Returns the date and time the specified file or directory was last accessed.
33.Returns the date and time the specified file or directory was last written to.
34.Sets the date and time the specified file or directory was last accessed.
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