用这个类可以替代VB自带的Timer控件

原文地址：http://hi.baidu.com/qqool/blog/item/2bce35fa5488e21aa9d31167.html

用这个类可以替代VB自带的Timer控件，这样就不用在无窗体的项目中仅为了使用Timer而多加一个窗体了。我一般用在ActiveX exe中用来分离系统控制权，用Timer的好处是避免控制权死锁，这样也就模拟出了多线程(实际上是多进程)，能给用户更好的体验。代码如下：
想直接使用的请到这里下载：http://www.chenoe.com/developer/library/timer.dll

标准模块(mTimer):
Option Explicit
Private Declare Sub copyMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (ByRef Destination As Any,ByRef Source As Any,ByVal Length As Long)
Public TimerColl As New VBA.Collection

Public Sub TimeProc(ByVal hWnd As Long,ByVal uMsg As Long,ByVal idEvent As Long,ByVal dwTime As Long)
Dim Timer As Timer,lpTimer As Long
lpTimer = TimerColl("ID:" & idEvent)
copyMemory Timer,lpTimer,4&
Timer.pulseTimer
copyMemory Timer,0&,4&
End Sub

类模块(Timer):
Option Explicit

Private Declare Function SetTimer Lib "user32" (ByVal hWnd As Long,ByVal nIDEvent As Long,ByVal uElapse As Long,ByVal lpTimerFunc As Long) As Long
Private Declare Function KillTimer Lib "user32" (ByVal hWnd As Long,ByVal nIDEvent As Long) As Long

Private m_TimerID As Long
Private m_Interval As Long
Private m_Enabled As Boolean

Public Tag As Variant
Public Event Timer()

Public Property Get Interval() As Long
Interval = m_Interval
End Property

Public Property Let Interval(ByVal Value As Long)
m_Interval = Value
Enabled = m_Enabled
End Property

Public Property Get Enabled() As Boolean
Interval = m_Enabled
End Property

Public Property Let Enabled(ByVal Value As Boolean)
If Value Then
m_Enabled = StartTimer
Else
Call StopTimer
End If
End Property

Private Function StartTimer() As Boolean
If m_TimerID = 0 Then
If m_Interval > 0 Then
m_TimerID = SetTimer(0,m_Interval,AddressOf TimeProc)
If m_TimerID <> 0 Then
TimerColl.Add ObjPtr(Me),"ID:" & m_TimerID
StartTimer = True
End If
Else
m_Enabled = True
End If
End If
End Function

Friend Sub pulseTimer()
RaiseEvent Timer
End Sub

Private Sub StopTimer()
If m_TimerID <> 0 Then
KillTimer 0,m_TimerID
TimerColl.Remove "ID:" & m_TimerID
m_TimerID = 0
m_Enabled = False
End If
End Sub

Private Sub Class_Terminate()
Call StopTimer
End Sub

使用方法：Private WithEvents Timer1 As TimerPrivate Sub Form_Load() Set Timer1 = New TimerLib.Timer Timer1.Interval = 1000 Timer1.Enabled = TrueEnd SubPrivate Sub Timer1_Timer() Debug.Print NowEnd Sub