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How to find a file by the modification date?

Posted on 2004-11-07
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Last Modified: 2010-04-24
Let's say I have a directory like:"C:\Files\Data\HTML" which contains numerous *.html files. There are HTML files that are added and updated in this directory. I want to find the *.html file that was last modified(added or created) in this directory. Any ideas??

Here is the code that I used in VB 5.0:

Dim X, TEMP, THEFILE
      X = Dir("C:\Files\Data\HTML\*.html"
     TEMP = 0
     Do until X = ""
     If FileDateTime("c:\files\data\html\" & X) > TEMP then
        TEMP = FileDateTime("c:\files\data\html\" & X)
        THEFILE = X
     end if
     X = DIR()
     LOOP
     MsgBox (THEFILE)

I tried to do this in my VB .Net app., but I get the following error: 'Operator is not valid for type 'Date' and type 'Integer' on this line of code:

If FileDateTime("c:\files\data\html\" & X) > TEMP then


Thanks,
Rich
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Question by:Richard Kreidl
1 Comment
 
LVL 86

Accepted Solution

by:
Mike Tomlinson earned 2000 total points
ID: 12519334
Try this out:

Imports System.IO

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 FolderBrowserDialog1 As System.Windows.Forms.FolderBrowserDialog
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents Label2 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.FolderBrowserDialog1 = New System.Windows.Forms.FolderBrowserDialog
        Me.Label1 = New System.Windows.Forms.Label
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Label2 = New System.Windows.Forms.Label
        Me.SuspendLayout()
        '
        'Label1
        '
        Me.Label1.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.Label1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
        Me.Label1.Location = New System.Drawing.Point(8, 8)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(528, 40)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "Label1"
        '
        'Button1
        '
        Me.Button1.Anchor = CType((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.Button1.Location = New System.Drawing.Point(544, 8)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(56, 40)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "Select Folder"
        '
        'Button2
        '
        Me.Button2.Location = New System.Drawing.Point(8, 64)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(56, 40)
        Me.Button2.TabIndex = 2
        Me.Button2.Text = "Find Newest"
        '
        'Label2
        '
        Me.Label2.Anchor = CType(((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles)
        Me.Label2.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
        Me.Label2.Location = New System.Drawing.Point(72, 64)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(528, 40)
        Me.Label2.TabIndex = 3
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(608, 118)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Button2)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.Label1)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Label1.Text = Application.StartupPath
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If FolderBrowserDialog1.ShowDialog = DialogResult.OK Then
            Label1.Text = FolderBrowserDialog1.SelectedPath
        End If
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim folderPath As String = Label1.Text
        If Directory.Exists(folderPath) Then
            Dim curDate As DateTime
            Dim newestFile As String
            Dim newestDate As DateTime
            Dim curFile As String
            Dim files() As String

            files = Directory.GetFiles(folderPath)
            For Each curfile In files
                curDate = System.IO.File.GetLastWriteTime(curfile)
                If (newestFile Is Nothing) OrElse (curDate > newestDate) Then
                    newestFile = curFile
                    newestDate = curDate
                End If
            Next
            Label2.Text = newestFile & vbCrLf & newestDate.ToString
        Else
            MessageBox.Show(folderPath, "Folder not found", MessageBoxButtons.OK, MessageBoxIcon.Error)
        End If
    End Sub

End Class
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