VB6.0調用SetTimer實現定時器

Timer.bas：

Option Explicit

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

Public Sub TimerProc(ByVal hwnd As Long, ByVal uMsg As Long, ByVal idEvent As Long, ByVal dwTime As Long)
    MsgBox Now()
End Sub

窗體代碼：

Option Explicit

Dim lngTimerID As Long
Dim BlnTimer As Boolean

Private Sub Form_Load()
    BlnTimer = False
    Command1.Caption = "定時開始"
End Sub

Private Sub Form_Unload(Cancel As Integer)
    KillTimer 0, lngTimerID
End Sub

Private Sub Command1_Click()
    If BlnTimer = False Then
        '每5秒鐘調用一次函數
        lngTimerID = SetTimer(0, 0, 5000, AddressOf TimerProc)
        BlnTimer = True
        Command1.Caption = "定時結束"
    Else
        KillTimer 0, lngTimerID
        BlnTimer = False
        Command1.Caption = "定時開始"
    End If
End Sub

說明：
TimerProc函數定義一定要放在bas模塊文件中，否則運行代碼"lngTimerID = SetTimer(0, 0, 5000, AddressOf TimerProc)"會報錯，

提示：操作符 AddressOf 使用無效。