Question

跪求，vb程序中关机代码是什么？

Answer 1

转载：这是个强力关机的，就像关电源，嘿嘿
一般来说,关机或Logff後,Windows会传依序送出WM_QUERYENDSESSION的讯息给每个
Process,如果中间有一个Process不能顺利结束(例如：Word修改後未存档,而出现是
否存档,但我们按取消),这时该讯息执行的结果会传回False(0),这时Windows也就
不再继续送WM_QUERYENDSESSION给下一个Proccess。反之,如果所有的Process都可以
顺利结束(也就是每个送出的WM_QUERYENDSESSION都传回True),那才代表可以顺利结束。

不管WM_QUERYENDSESSION最後的结果是可以顺利结束或不能顺利结束,Windows会再送
一个WM_ENDSESSION的讯息给所有的Process,而wParam的内容便是指出是否可以顺利
结束(True表可以,False表不行,在vb中则Check wParam = 0 表False , <> 0表True)
,说到这里大概就知道该如何做啦,程式如下：
'以下在Form
Private Sub Form_Load()
Dim ret As Long
'记录原本的Window Procedure的位址
preWinProc = GetWindowLong(Me.hwnd, GWL_WNDPROC)
'设定form的window Procedure到wndproc
ret = SetWindowLong(Me.hwnd, GWL_WNDPROC, AddressOf wndproc)
End Sub

Private Sub Form_Unload(Cancel As Integer)
Dim ret As Long
'取消Message的截取,而使之又只送往原来的Window Procedure
ret = SetWindowLong(Me.hwnd, GWL_WNDPROC, preWinProc)
'这里只是要看看用关机的方式结束程式时,会不会执行到这里
Dim fno As Long
fno = FreeFile
Open "c:\tt2 " For Append As fno
Print #fno, "ccc " + vbCrLf
Close #fno
End Sub

'以下在.Bas
Option Explicit

Declare Function SetWindowLong Lib "user32 " Alias "SetWindowLongA " _
(ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Declare Function GetWindowLong Lib "user32 " Alias "GetWindowLongA " _
(ByVal hwnd As Long, ByVal nIndex As Long) As Long
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 Const GWL_WNDPROC = (-4)
Public Const WM_ENDSESSION = &H16
Public Const WM_QUERYENDSESSION = &H11

Public preWinProc As Long

Public Function wndproc(ByVal hwnd As Long, ByVal Msg As Long, _
ByVal wParam As Long, ByVal lParam As Long) As Long
If Msg = WM_QUERYENDSESSION Then
Debug.Print "QryEnd ", wParam, lParam
Else
If Msg = WM_ENDSESSION Then
If wParam <> 0 Then '代表将顺利关机或LogOff,这时便得做正常结束程式的动作
Dim fno As Long
Open "c:\ttt " For Output As #1
Print #1, "hahcccc5 "
Close #1
End If
End If
End If
'将之送往原来的Window Procedure
wndproc = CallWindowProc(preWinProc, hwnd, Msg, wParam, lParam)
End Function

Answer 2

shell "-shutdown -s -t 0" 胡健回答

Answer 3

shell "shutdown -s"