HOW TO:监视系统的NumLock,CapsLock,ScrollLock,Insert状态

Author:水如烟

这个类要利用上面的鼠标键盘钩子类

StatusKeySateWatcher.EventArgs.vb 事件参数定义

Namespace uWindows
    Partial Class StatusKeySateWatcher
        Public Class EventArgs
            Inherits System.EventArgs

            Private gIsEnabled As Boolean
            Private gMsgKey As MsgKeyEnum

            Sub New(ByVal msgkey As MsgKeyEnum, ByVal isenabled As Boolean)
                gMsgKey = msgkey
                gIsEnabled = isenabled
            End Sub

            Public ReadOnly Property MsgKey() As MsgKeyEnum
                Get
                    Return gMsgKey
                End Get
            End Property

            Public ReadOnly Property IsEnabled() As Boolean
                Get
                    Return gIsEnabled
                End Get
            End Property

        End Class

        Public Enum MsgKeyEnum
            NumLock
            CapsLock
            ScrollLock
            Insert
        End Enum
    End Class
End Namespace

StatusKeySateWatcher.vb 功能键状态指示类

Namespace uWindows
    Public Class StatusKeySateWatcher
        Public Event TimeChanged(ByVal now As DateTime)
        Public Event KeySateChanged(ByVal sender As Object, ByVal e As StatusKeySateWatcher.EventArgs)

        Private WithEvents gKeyboardHook As New uWindows.MouseKeyboardHook
        Private WithEvents gMainForm As Windows.Forms.Form
        Private WithEvents gTimer As New System.Timers.Timer(1000)

        Sub New(ByVal mainform As Windows.Forms.Form)
            gMainForm = mainform
            Initialize()
        End Sub

        Private Sub Initialize()
            gKeyboardHook.Start(MouseKeyboardHook.HookWay.Keyboard)
            gTimer.Start()
        End Sub

        '取各键现值
        Private Sub GetOriginalState()
            Dim sender As Object = Nothing
            Dim mEventArgs As StatusKeySateWatcher.EventArgs = Nothing
            mEventArgs = New StatusKeySateWatcher.EventArgs(MsgKeyEnum.NumLock, Not KeyIsEnabled(Windows.Forms.Keys.NumLock))
            RaiseEvent KeySateChanged(sender, mEventArgs)
            mEventArgs = New StatusKeySateWatcher.EventArgs(MsgKeyEnum.CapsLock, Not KeyIsEnabled(Windows.Forms.Keys.CapsLock))
            RaiseEvent KeySateChanged(sender, mEventArgs)
            mEventArgs = New StatusKeySateWatcher.EventArgs(MsgKeyEnum.ScrollLock, Not KeyIsEnabled(Windows.Forms.Keys.Scroll))
            RaiseEvent KeySateChanged(sender, mEventArgs)
            mEventArgs = New StatusKeySateWatcher.EventArgs(MsgKeyEnum.Insert, Not KeyIsEnabled(Windows.Forms.Keys.Insert))
            RaiseEvent KeySateChanged(sender, mEventArgs)
        End Sub

        Protected Overrides Sub Finalize()
            gKeyboardHook.Stop()
            gTimer.Dispose()
            MyBase.Finalize()
        End Sub

        Private Sub gMainForm_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles gMainForm.FormClosing
            Me.Finalize()
        End Sub

        Private Sub gMainForm_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles gMainForm.Load
            Me.GetOriginalState()
        End Sub

        Private Sub gKeyboardHook_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles gKeyboardHook.KeyDown
            Dim mEventArgs As StatusKeySateWatcher.EventArgs = Nothing
            Select Case e.KeyCode
                Case Windows.Forms.Keys.NumLock
                    mEventArgs = New StatusKeySateWatcher.EventArgs(MsgKeyEnum.NumLock, KeyIsEnabled(Windows.Forms.Keys.NumLock))
                    RaiseEvent KeySateChanged(sender, mEventArgs)
                Case Windows.Forms.Keys.CapsLock
                    mEventArgs = New StatusKeySateWatcher.EventArgs(MsgKeyEnum.CapsLock, KeyIsEnabled(Windows.Forms.Keys.CapsLock))
                    RaiseEvent KeySateChanged(sender, mEventArgs)
                Case Windows.Forms.Keys.Scroll
                    mEventArgs = New StatusKeySateWatcher.EventArgs(MsgKeyEnum.ScrollLock, KeyIsEnabled(Windows.Forms.Keys.Scroll))
                    RaiseEvent KeySateChanged(sender, mEventArgs)
                Case Windows.Forms.Keys.Insert
                    mEventArgs = New StatusKeySateWatcher.EventArgs(MsgKeyEnum.Insert, KeyIsEnabled(Windows.Forms.Keys.Insert))
                    RaiseEvent KeySateChanged(sender, mEventArgs)
            End Select

        End Sub

        Private Function KeyIsEnabled(ByVal keycode As Windows.Forms.Keys) As Boolean
            Return Not CType(SafeNativeMethods.GetKeyState(keycode), Boolean)
        End Function

        Private Sub mTimer_Elapsed(ByVal sender As Object, ByVal e As System.Timers.ElapsedEventArgs) Handles gTimer.Elapsed
            RaiseEvent TimeChanged(e.SignalTime)
        End Sub

    End Class
End Namespace

使用:

Public Class MainForm


    Private WithEvents gKeyState As New LzmTW.uWindows.StatusKeySateWatcher(Me)

    Private Sub gKeyState_KeySateChanged(ByVal sender As Object, ByVal e As LzmTW.uWindows.StatusKeySateWatcher.EventArgs) Handles gKeyState.KeySateChanged
        Select Case e.MsgKey
            Case LzmTW.uWindows.StatusKeySateWatcher.MsgKeyEnum.NumLock
                Me.NumLockToolStripStatusLabel.Enabled = e.IsEnabled
            Case LzmTW.uWindows.StatusKeySateWatcher.MsgKeyEnum.CapsLock
                Me.CapsLockToolStripStatusLabel.Enabled = e.IsEnabled
            Case LzmTW.uWindows.StatusKeySateWatcher.MsgKeyEnum.ScrollLock
                Me.ScrollLockToolStripStatusLabel.Enabled = e.IsEnabled
            Case LzmTW.uWindows.StatusKeySateWatcher.MsgKeyEnum.Insert
                Me.InsertToolStripStatusLabel.Enabled = e.IsEnabled
        End Select
    End Sub


    Private Sub gKeyState_TimeChanged(ByVal now As Date) Handles gKeyState.TimeChanged
        Me.TimeToolStripStatusLabel.Text = now.ToString
    End Sub

End Class