窗體代碼Private Sub Form_Load()
Timer1_Timer
RegisterWindow Me.hwnd '為窗口設置子類
End SubPrivate Sub Form_Unload(Cancel As Integer)
unRegisterWindow Me.hwnd '取消窗口的子類
End SubPrivate Sub Timer1_Timer()
OldTime = Now
End Sub'模塊modle1:Option Explicit
Public Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Public Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Public Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hwnd As Long, ByVal msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Declare Function RegisterWindowMessage Lib "user32" Alias "RegisterWindowMessageA" (ByVal lpString As String) As Long
Public OldTime As String
Public ChangeFlag As Boolean
Public Const WM_TIMECHANGE As Long = &H1E '當系統的時間變化時發送此消息給所有頂級窗口
Public oldproc As Long
Private Type SYSTEMTIME
wYear As Integer
wMonth As Integer
wDayOfWeek As Integer
wDay As Integer
wHour As Integer
wMinute As Integer
wSecond As Integer
wMilliseconds As Integer
End Type
Private Declare Function SetLocalTime Lib "kernel32" (lpSystemTime As SYSTEMTIME) As LongPublic Function RegisterWindow(hwnd As Long) As Long
If hwnd <> 0 Then
oldproc = SetWindowLong(hwnd, -4, AddressOf WinProc)
End If
End Function
Public Function unRegisterWindow(hwnd As Long) As LongIf hwnd <> 0 Then
SetWindowLong hwnd, -4, oldproc
End IfEnd Function
Public Function WinProc(ByVal hwnd As Long, ByVal msg As Long, ByVal lpara As Long, ByVal wpara As Long) As LongDim i, myttIf msg = WM_TIMECHANGE And ChangeFlag = False Then '系統時間被修改了而且不是本程序修改的ChangeFlag = True '本程序要修改系統時間Call SetToOldTime '修改系統時間Exit FunctionEnd If
ChangeFlag = FalseWinProc = CallWindowProc(oldproc, hwnd, msg, lpara, wpara)
End Function
Public Function SetToOldTime() As String '將時間恢復到設置前的狀態
Dim tmp As String
tmp = OldTime '從保存的時間中取出修改前的系統時間
Dim lpSystemTime As SYSTEMTIME
lpSystemTime.wYear = Year(tmp) '取出年份
lpSystemTime.wMonth = Month(tmp) '取出月份
lpSystemTime.wDayOfWeek = -1
lpSystemTime.wDay = Day(tmp) '取出日
lpSystemTime.wHour = Hour(tmp) '取出小時
lpSystemTime.wMinute = Minute(tmp) '取出分鐘
lpSystemTime.wSecond = Second(tmp) '取出秒
lpSystemTime.wMilliseconds = 0
'set the new time
SetLocalTime lpSystemTimeEnd Function