求助，在vb中的系统关机，重起代码。

Private Declare Function ExitWindowsEx Lib "user32" (ByVal uFlags As Integer, ByVal dwReserved As Integer) As Integer

Const EWX_FORCE As Short = 4

Const EWX_LOGOFF As Short = 0

Const EWX_REBOOT As Short = 2

Const EWX_SHUTDOWN As Short = 1

Dim retval As Integer

' 定义Esc按键

Const VK_ESCAPE As Short = &H1Bs

Private Sub Command1_Click(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles Command1.Click

If Option1.Checked Then

' 注销当前用户

retval = ExitWindowsEx(EWX_FORCE, 0)

ElseIf Option2.Checked Then

' 关闭计算机

retval = ExitWindowsEx(EWX_SHUTDOWN, 0)

ElseIf Option3.Checked Then

' 重新启动

retval = ExitWindowsEx(EWX_REBOOT, 0)

End If

End Sub

Private Sub Command2_Click(ByVal eventSender As System.Object, ByVal eventArgs As System