vb点虐 里面怎么没有sleep啊

它在System.Threading命名空间的Thread类中定义了

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直接用 System.Threading.Thread.Sleep()方法

System.Threading.Thread.Sleep(time )‘time为整数，单位毫秒

vb点虐 使用Sleep后有些代码没有执行！

在VB.NET中，带框架窗体的大小是不能为0的，要想做到高、宽都为0，需要自己重绘一个无边框窗体，用外置图片来绘制，配合PS做一些图片，既可以换肤还能做的很漂亮。

按当前代码修改，你把下面的代码粘回去就可以了，窗体的高和宽达到最小时，循环会自己退出，避免无限循环；

Select Case 2

Case Is = 1

Dim w As Integer = Me.Width

Do

Me.Width -= 5 : w -= 5

Threading.Thread.Sleep(3)

Loop While Me.Width = w

Case Is = 2

Dim h As Integer = Me.Height

Do

Me.Height -= 5 : h -= 5

Threading.Thread.Sleep(3)

Loop While Me.Height = h

Case Is = 3

Do

Me.Opacity -= 0.05

Threading.Thread.Sleep(120)

Loop Until Me.Opacity = 0

End Select

求计算机休眠代码

VB.NET中实现"关机/休眠/重启/注销"的类Imports System

Imports System.Text

Imports System.Diagnostics

Imports System.Runtime.InteropServices

Public Class WindowsController

Public Enum RestartOptions

LogOff = 0

PowerOff = 8

Reboot = 2

ShutDown = 1

Suspend = -1

Hibernate = -2

End Enum

Public Structure LUID

Dim LowPart As Integer

Dim HighPart As Integer

End Structure

Public Structure LUID_AND_ATTRIBUTES

Dim pLuid As LUID

Dim Attributes As Integer

End Structure

Public Structure TOKEN_PRIVILEGES

Dim PrivilegeCount As Integer

Dim Privileges As LUID_AND_ATTRIBUTES

End Structure

Private Const TOKEN_ADJUST_PRIVILEGES = H20

Private Const TOKEN_QUERY = H8

Private Const SE_PRIVILEGE_ENABLED = H2

Private Const FORMAT_MESSAGE_FROM_SYSTEM = H1000

Private Const EWX_FORCE = 4

Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As IntPtr

Declare Function FreeLibrary Lib "kernel32" (ByVal hLibModule As IntPtr) As Integer

Declare Function GetProcAddress Lib "kernel32" (ByVal hModule As IntPtr, ByVal lpProcName As String) As IntPtr

Declare Function SetSuspendState Lib "Powrprof" (ByVal Hibernate As Integer, ByVal ForceCritical As Integer, ByVal DisableWakeEvent As Integer) As Integer

Declare Function OpenProcessToken Lib "advapi32.dll" (ByVal ProcessHandle As IntPtr, ByVal DesiredAccess As Integer, ByRef TokenHandle As IntPtr) As Integer

Declare Function LookupPrivilegeValue Lib "advapi32.dll" Alias "LookupPrivilegeValueA" (ByVal lpSystemName As String, ByVal lpName As String, ByRef lpLuid As LUID) As Integer

Declare Function AdjustTokenPrivileges Lib "advapi32.dll" (ByVal TokenHandle As IntPtr, ByVal DisableAllPrivileges As Integer, ByRef NewState As TOKEN_PRIVILEGES, ByVal BufferLength As Integer, ByRef PreviousState As TOKEN_PRIVILEGES, ByRef ReturnLength As Integer) As Integer

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

Declare Function FormatMessage Lib "kernel32" Alias "FormatMessageA" (ByVal dwFlags As Integer, ByVal lpSource As IntPtr, ByVal dwMessageId As Integer, ByVal dwLanguageId As Integer, ByVal lpBuffer As StringBuilder, ByVal nSize As Integer, ByVal Arguments As Integer) As Integer

Public Sub ExitWindows(ByVal how As RestartOptions, ByVal force As Boolean)

Select Case how

Case RestartOptions.Suspend

SuspendSystem(False, force)

Case RestartOptions.Hibernate

SuspendSystem(True, force)

Case Else

ExitWindows(Convert.ToInt32(how), force)

End Select

End Sub

Protected Sub ExitWindows(ByVal how As Integer, ByVal force As Boolean)

EnableToken("SeShutdownPrivilege")

If force Then how = how Or EWX_FORCE

If (ExitWindowsEx(how, 0) = 0) Then Throw New PrivilegeException(FormatError(Marshal.GetLastWin32Error()))

End Sub

Protected Sub EnableToken(ByVal privilege As String)

If Not CheckEntryPoint("advapi32.dll", "AdjustTokenPrivileges") Then Return

Dim tokenHandle As IntPtr = IntPtr.Zero

Dim privilegeLUID = New LUID()

Dim newPrivileges = New TOKEN_PRIVILEGES()

Dim tokenPrivileges As TOKEN_PRIVILEGES

If (OpenProcessToken(Process.GetCurrentProcess().Handle, TOKEN_ADJUST_PRIVILEGES Or TOKEN_QUERY, tokenHandle)) = 0 Then Throw New PrivilegeException(FormatError(Marshal.GetLastWin32Error()))

If (LookupPrivilegeValue("", privilege, privilegeLUID)) = 0 Then Throw New PrivilegeException(FormatError(Marshal.GetLastWin32Error()))

tokenPrivileges.PrivilegeCount = 1

tokenPrivileges.Privileges.Attributes = SE_PRIVILEGE_ENABLED

tokenPrivileges.Privileges.pLuid = privilegeLUID

Dim Size As Integer = 4

If (AdjustTokenPrivileges(tokenHandle, 0, tokenPrivileges, 4 + (12 * tokenPrivileges.PrivilegeCount), newPrivileges, Size)) = 0 Then Throw New PrivilegeException(FormatError(Marshal.GetLastWin32Error()))

End Sub

Protected Sub SuspendSystem(ByVal hibernate As Boolean, ByVal force As Boolean)

If Not CheckEntryPoint("powrprof.dll", "SetSuspendState") Then Throw New PlatformNotSupportedException("The SetSuspendState method is not supported on this system!")

SetSuspendState(Convert.ToInt32(IIf(hibernate, 1, 0)), Convert.ToInt32(IIf(force, 1, 0)), 0)

End Sub

Protected Function CheckEntryPoint(ByVal library As String, ByVal method As String) As Boolean

Dim libPtr As IntPtr = LoadLibrary(library)

If Not libPtr.Equals(IntPtr.Zero) Then

If Not GetProcAddress(libPtr, method).Equals(IntPtr.Zero) Then

FreeLibrary(libPtr)

Return True

End If

FreeLibrary(libPtr)

End If

Return False

End Function

Protected Function FormatError(ByVal number As Integer) As String

Dim Buffer = New StringBuilder(255)

FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, IntPtr.Zero, number, 0, Buffer, Buffer.Capacity, 0)

Return Buffer.ToString()

End Function

End Class

Public Class PrivilegeException

Inherits Exception

Public Sub New()

MyBase.New()

End Sub

Public Sub New(ByVal message As String)

MyBase.New(message)

End Sub

End Class

例如实现注销功能：

Dim shutdown As New WindowsController()

shutdown.ExitWindows(shutdown.RestartOptions.LogOff, False

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