VB.Net Tutorial/Windows/Windows Service

Backup service

Imports System.Diagnostics
Imports System.ServiceProcess
Imports System.IO
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.ruponentModel.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 = "BackupService"
    End Sub
#End Region
    Private WithEvents FileWatch As FileSystemWatcher
    Protected Sub OnChanged(ByVal From As Object, ByVal e As FileSystemEventArgs) Handles FileWatch.Changed
        Dim Log As New EventLog("Application")
        Log.Source = "BackupService"
        Log.WriteEntry("File " & e.Name & " changed at " & DateTime.Now)
        Log.WriteEntry("File " & e.FullPath & " changed at " & DateTime.Now)
        Log.Close()
        File.Copy(e.FullPath, "C:\Data\Backup\" & e.Name)
    End Sub
    Protected Sub OnCreated(ByVal From As Object, ByVal e As FileSystemEventArgs) Handles FileWatch.Created
        Dim Log As New EventLog("Application")
        Log.Source = "BackupService"
        Log.WriteEntry("File " & e.Name & " created at " & DateTime.Now)
        Log.WriteEntry("File " & e.FullPath & " created at " & DateTime.Now)
        Log.Close()
        File.Copy(e.FullPath, "C:\Data\Backup\" & e.Name)
    End Sub
    Protected Overrides Sub OnStart(ByVal args() As String)
        Try
            Directory.CreateDirectory("C:\Data")
            Directory.CreateDirectory("C:\Data\Backup")
            FileWatch = New FileSystemWatcher("C:\Data")
            FileWatch.Filter = "*.*"
            FileWatch.IncludeSubdirectories = True
            FileWatch.EnableRaisingEvents = True
            Dim Log As New EventLog("Application")
            Log.Source = "BackupService"
            Log.WriteEntry("Service started at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub
    Protected Shadows Sub OnPause(ByVal args() As String)
        Try
            FileWatch.EnableRaisingEvents = False
            Dim Log As New EventLog("Application")
            Log.Source = "BackupService"
            Log.WriteEntry("Service paused at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub
    Protected Shadows Sub OnContinue(ByVal args() As String)
        Try
            FileWatch.EnableRaisingEvents = True
            Dim Log As New EventLog("Application")
            Log.Source = "BackupService"
            Log.WriteEntry("Service continued at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub
    Protected Shadows Sub OnShutdown(ByVal args() As String)
        Try
            FileWatch.EnableRaisingEvents = False
            Dim Log As New EventLog("Application")
            Log.Source = "BackupService"
            Log.WriteEntry("Service shutdown at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub
    Protected Overrides Sub OnStop()
        Try
            FileWatch.EnableRaisingEvents = False
            Dim Log As New EventLog("Application")
            Log.Source = "BackupService"
            Log.WriteEntry("Service stopped at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub
End Class

Inherits System.ServiceProcess.ServiceBase to create a 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.ruponentModel.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

Log service

Imports System.Diagnostics
Imports System.ServiceProcess
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.ruponentModel.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 = "LogService"
    End Sub
#End Region

    Protected Overrides Sub OnStart(ByVal args() As String)
        Try
            Dim Log As New EventLog("Application")
            Log.Source = "LogService"
            Log.WriteEntry("Service started at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub
    Protected Shadows Sub OnPause(ByVal args() As String)
        Try
            Dim Log As New EventLog("Application")
            Log.Source = "LogService"
            Log.WriteEntry("Service paused at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub
    Protected Shadows Sub OnContinue(ByVal args() As String)
        Try
            Dim Log As New EventLog("Application")
            Log.Source = "LogService"
            Log.WriteEntry("Service continued at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub
    Protected Shadows Sub OnShutdown(ByVal args() As String)
        Try
            Dim Log As New EventLog("Application")
            Log.Source = "LogService"
            Log.WriteEntry("Service shutdown at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub
    Protected Overrides Sub OnStop()
        Try
            Dim Log As New EventLog("Application")
            Log.Source = "LogService"
            Log.WriteEntry("Service stopped at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub

End Class

Service timer

Imports System.Diagnostics
Imports System.ServiceProcess
Imports System.Timers
Imports System.IO
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.ruponentModel.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 = "ServiceTimer"
    End Sub
#End Region
    Private WithEvents Alarm As Timer = New Timer(300000) " 5 minutes
    Public Sub OnTimedEvent(ByVal source As Object, ByVal e As ElapsedEventArgs) Handles Alarm.Elapsed
        Dim DirInfo As DirectoryInfo = New DirectoryInfo("C:\")
        Dim Log As New EventLog("Application")
        Log.Source = "ServiceTimer"
        Log.WriteEntry("Root files at " & Now() & " is " & _
                 DirInfo.GetFiles("*.*").Length())
        Log.Close()
    End Sub

    Protected Overrides Sub OnStart(ByVal args() As String)
        Alarm.Enabled = True
        Try
            Dim Log As New EventLog("Application")
            Log.Source = "ServiceTimer"
            Log.WriteEntry("Service started at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub
    Protected Shadows Sub OnPause(ByVal args() As String)
        Alarm.Enabled = False
        Try
            Dim Log As New EventLog("Application")
            Log.Source = "ServiceTimer"
            Log.WriteEntry("Service paused at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub
    Protected Shadows Sub OnContinue(ByVal args() As String)
        Alarm.Enabled = True
        Try
            Dim Log As New EventLog("Application")
            Log.Source = "ServiceTimer"
            Log.WriteEntry("Service continued at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub
    Protected Shadows Sub OnShutdown(ByVal args() As String)
        Alarm.Enabled = False
        Try
            Dim Log As New EventLog("Application")
            Log.Source = "ServiceTimer"
            Log.WriteEntry("Service shutdown at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub
    Protected Overrides Sub OnStop()
        Alarm.Enabled = False
        Try
            Dim Log As New EventLog("Application")
            Log.Source = "ServiceTimer"
            Log.WriteEntry("Service stopped at " & DateTime.Now)
            Log.Close()
        Catch E As Exception
        End Try
    End Sub
End Class

Your first service

Imports System.Diagnostics
Imports System.ServiceProcess
Imports System.IO
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.ruponentModel.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 = "DemoService"
    End Sub
#End Region

    Private FileSt As StreamWriter
    Protected Overrides Sub OnStart(ByVal args() As String)
        Try
            FileSt = New StreamWriter("C:\DemoEvents.log", True)
            FileSt.WriteLine("Service started at " & DateTime.Now)
            FileSt.Flush()
        Catch E As Exception
        End Try
    End Sub
    Protected Shadows Sub OnPause(ByVal args() As String)
        Try
            FileSt.WriteLine("Service paused at " & DateTime.Now)
            FileSt.Flush()
        Catch E As Exception
        End Try
    End Sub
    Protected Shadows Sub OnContinue(ByVal args() As String)
        Try
            FileSt.WriteLine("Service continued at " & DateTime.Now)
            FileSt.Flush()
        Catch E As Exception
        End Try
    End Sub
    Protected Shadows Sub OnShutdown(ByVal args() As String)
        Try
            FileSt.WriteLine("Service shutdown at " & DateTime.Now)
            FileSt.Close()
        Catch E As Exception
        End Try
    End Sub
    Protected Overrides Sub OnStop()
        Try
            FileSt.WriteLine("Service stopped at " & DateTime.Now)
            FileSt.Close()
        Catch E As Exception
        End Try
    End Sub
End Class