Inherits System.ServiceProcess.ServiceBase to create a service : Windows Service « Windows « VB.Net Tutorial

1. VB.Net Tutorial
2. Windows
3. Windows Service

Imports System.ServiceProcess        
Imports System.Timers
Imports System.IO
Imports System.Threading
Imports System.Web.Mail
Imports System.Diagnostics

Public Class Service1
    Inherits System.ServiceProcess.ServiceBase

#Region " Component Designer generated code "

    Public Sub New()
        MyBase.New()

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

        ' Add any initialization after the InitializeComponent() call

    End Sub

    'UserService 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

    ' The main entry point for the process
    <MTAThread()> _
    Shared Sub Main()
        Dim ServicesToRun() As System.ServiceProcess.ServiceBase

        ' More than one NT Service may run within the same process. To add
        ' another service to this process, change the following line to
        ' create a second service object. For example,
        '
        '   ServicesToRun = New System.ServiceProcess.ServiceBase () {New Service1, New MySecondUserService}
        '
        ServicesToRun = New System.ServiceProcess.ServiceBase() {New Service1()}

        System.ServiceProcess.ServiceBase.Run(ServicesToRun)
    End Sub

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

    ' NOTE: The following procedure is required by the Component Designer
    ' It can be modified using the Component Designer.  
    ' Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        '
        'Service1
        '
        Me.CanPauseAndContinue = True
        Me.CanShutdown = True
        Me.ServiceName = "BigFileCheck"

    End Sub

#End Region

    Private WithEvents Alarm As Timers.Timer = New Timers.Timer(300000) ' 5 minutes
    Private BigFileNames As String = ""

    Sub SearchTree(ByVal Dir As String)
        Dim DirObj As New DirectoryInfo(Dir)

        Dim Files As FileInfo() = DirObj.GetFiles("*.*")
        Dim Dirs As DirectoryInfo() = DirObj.GetDirectories("*.*")

        Dim Filename As FileInfo

        For Each Filename In Files
            If Filename.Length >= 1048576 Then
                BigFileNames = Filename.FullName & Chr(13) & Chr(10)
            End If
        Next

        Dim DirectoryName As DirectoryInfo

        For Each DirectoryName In Dirs
            Try
                SearchTree(DirectoryName.FullName)
            Catch E As Exception
            End Try
        Next
    End Sub

    Public Sub CheckBigFiles()
        SearchTree("C:\")

        If (BigFileNames.Length > 0) Then
        Try
            Dim Log As New EventLog("Application")
            Log.Source = "Check big file service"
            Log.WriteEntry("Big file found " & DateTime.Now)
            Log.Close()
        Catch E As Exception

        End Try
        End If
    End Sub


    Public Sub OnTimedEvent(ByVal source As Object, ByVal e As ElapsedEventArgs) Handles Alarm.Elapsed
        Dim FileCheck As Thread

        FileCheck = New Thread(AddressOf CheckBigFiles)

        FileCheck.Start()
    End Sub


    Protected Overrides Sub OnStart(ByVal args() As String)
        Alarm.Enabled = True
    End Sub

    Protected Shadows Sub OnPause(ByVal args() As String)
        Alarm.Enabled = False
    End Sub

    Protected Shadows Sub OnContinue(ByVal args() As String)
        Alarm.Enabled = True
    End Sub

    Protected Shadows Sub OnShutdown(ByVal args() As String)
        Alarm.Enabled = False
    End Sub

    Protected Overrides Sub OnStop()
        Alarm.Enabled = False
    End Sub

End Class