Question

VB下如何禁用系统键Ctrl+Alt+Del

如题...
要在WinXP下能运行的````

Answer 1

一个窗体文件FORM1.FRM,一个模块

'窗体代码开始:(保存为FORM1.FRM)
'////////////////////////////////////////////////////////
VERSION 5.00
Begin VB.Form Form1
Caption = "CTRL +ALT + DEL"
ClientHeight = 735
ClientLeft = 60
ClientTop = 450
ClientWidth = 4155
LinkTopic = "Form1"
ScaleHeight = 735
ScaleWidth = 4155
StartUpPosition = 3 '窗口缺省
Begin VB.CommandButton Command3
Caption = "启用"
Height = 495
Left = 2160
TabIndex = 1
Top = 120
Width = 1695
End
Begin VB.CommandButton Command1
Caption = "禁用"
Height = 495
Left = 240
TabIndex = 0
Top = 120
Width = 1695
End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private Sub Command1_Click()
Dim i As Boolean
i = LockKeyboard(True)
If i = True Then Me.Caption = i

Getkeykoardok
End Sub

Private Sub Getkeykoardok()
Dim i As Boolean
i = GetKeyboardState
If i = True Then Me.Caption = "CTRL +ALT + DEL已禁用" Else Me.Caption = "CTRL +ALT + DEL已启用"

End Sub

Private Sub Command3_Click()
Dim i As Boolean
i = LockKeyboard(False)
If i = True Then Me.Caption = i
Getkeykoardok

End Sub

'窗体代码结束:
'///////////////////////////////////////////////////////////////////

'模块代码开始:(保存为Module1.BAS)

Attribute VB_Name = "Module1"
Option Explicit
'注意，以下所有双版本的API均声明成了 UNICODE 版。 并且许多地方与VB的API浏览器生成的代码有所不同。
Private Declare Function OpenProcess Lib "kernel32" (ByVal _
dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal _
dwProcessId As Long) As Long
Private Declare Function ReadProcessMemory Lib "kernel32" (ByVal _
hProcess As Long, ByVal lpBaseAddress As Long, lpBuffer As Any, _
ByVal nSize As Long, _
lpNumberOfBytesWritten As Long) As Long
Private Declare Function WriteProcessMemory Lib "kernel32" (ByVal _
hProcess As Long, ByVal lpBaseAddress As Long, lpBuffer As Any, _
ByVal nSize As Long, _
lpNumberOfBytesWritten As Long) As Long
Private Declare Function GlobalAddAtom Lib "kernel32" Alias _
"GlobalAddAtomW" (ByVal lpString As Long) As Integer
Private Declare Function GlobalDeleteAtom Lib "kernel32" (ByVal _
nAtom As Integer) As Integer
Private Declare Function GlobalFindAtom Lib "kernel32" Alias _
"GlobalFindAtomW" (ByVal lpString As Long) As Integer
Private Const TH32CS_SNAPPROCESS = 2
Private Type PROCESSENTRY32W
dwSize As Long
cntUsage As Long
h32ProcessID As Long ' // this process
th32DefaultHeapID As Long '
h32ModuleID As Long ' // associated exe
cntThreads As Long '
th32ParentProcessID As Long ' // this process's parent process
pcPriClassBase As Long ' // Base priority of process'sthreads
dwFlags As Long '
szExeFile(1 To 260) As Integer ' // Path
End Type
Private Declare Function CreateToolhelp32Snapshot Lib "kernel32" (ByVal dwFlags As Long, ByVal th32ProcessID As Long) As Long
Private Declare Function Process32First Lib "kernel32" Alias "Process32FirstW" (ByVal hSnapshot As Long, lpPE As PROCESSENTRY32W) As Long
Private Declare Function Process32Next Lib "kernel32" Alias "Process32NextW" (ByVal hSnapshot As Long, lpPE As PROCESSENTRY32W) As Long
Private Declare Function lstrcmpi Lib "kernel32" Alias "lstrcmpiW" (lpString1 As Integer, ByVal lpString2 As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long

Private Type LUID
lowpart As Long
highpart As Long
End Type
Private Type LUID_AND_ATTRIBUTES
pLuid As LUID
Attributes As Long
End Type
Private Type TOKEN_PRIVILEGES
PrivilegeCount As Long
Privileges As LUID_AND_ATTRIBUTES
End Type
Private Const PROCESS_ALL_ACCESS As Long = &H1F0FFF
Private Const TOKEN_QUERY As Long = &H8&
Private Const TOKEN_ADJUST_PRIVILEGES As Long = &H20&
Private Const SE_PRIVILEGE_ENABLED As Long = &H2
Private Const SE_DEBUG_NAME As String = "SeDebugPrivilege"
Private Declare Function GetCurrentProcess Lib "kernel32" () As Long
Private Declare Function OpenProcessToken Lib "advapi32.dll" (ByVal ProcessHandle As Long, ByVal DesiredAccess As Long, TokenHandle As Long) As Long
Private Declare Function LookupPrivilegeValue Lib "advapi32.dll" Alias "LookupPrivilegeValueW" (ByVal lpSystemName As Long, ByVal lpName As Long, lpLuid As LUID) As Long
Private Declare Function AdjustTokenPrivileges Lib "advapi32.dll" (ByVal TokenHandle As Long, ByVal DisableAllPrivileges As Long, NewState As TOKEN_PRIVILEGES, _
ByVal BufferLength As Long, ByVal PrevState As Long, ByVal N As Long) As Long
Private Declare Function LoadLibrary Lib "kernel32" Alias _
"LoadLibraryW" (ByVal lpLibFileName As Long) As Long
Private Declare Function GetProcAddress Lib "kernel32" (ByVal _
hModule As Long, ByVal lpProcName As String) As Long
Private Declare Function FreeLibrary Lib "kernel32" (ByVal _
hLibModule As Long) As Long
Private Const MEM_COMMIT As Long = &H1000
Private Const MEM_DECOMMIT As Long = &H4000
Private Const PAGE_EXECUTE_READWRITE As Long = &H40
Private Declare Function VirtualAllocEx Lib "kernel32" (ByVal _
ProcessHandle As Long, ByVal lpAddress As Long, ByVal dwSize As _
Long, ByVal flAllocationType As Long, ByVal flProtect As Long) As Long
Private Declare Function VirtualFreeEx Lib "kernel32" (ByVal _
ProcessHandle As Long, ByVal lpAddress As Long, ByVal dwSize As _
Long, ByVal dwFreeType As Long) As Long
Private Declare Function CreateRemoteThread Lib "kernel32" (ByVal hProcess As Long, ByVal lpThreadAttributes As Long, ByVal dwStackSize As Long, ByVal lpStartAddress As Long, ByVal lpParameter As Long, ByVal dwCreationFlags As Long, lpThreadId As Long) As Long
Private Declare Function SetWindowsHookEx Lib "user32" Alias "SetWindowsHookExW" (ByVal idHook As Long, ByVal lpfn As Long, ByVal hmod As Long, ByVal dwThreadId As Long) As Long
Private Declare Function UnhookWindowsHookEx Lib "user32" (ByVal hHook As Long) As Long
Private Declare Function CallNextHookEx Lib "user32" (ByVal hHook As Long, ByVal nCode As Long, ByVal wParam As Long, lParam As Any) As Long
Private Const ATOM_FLAG As String = "HookSysKey"
Private Const SHELL_FALG As String = "Winlogon"
Private Const SHELL_CODE_DWORDLEN = 240 '注入代码所占的双字数
Private Const SHELL_CODE_LENGTH = (SHELL_CODE_DWORDLEN * 4) '字节数
Private Const SHELL_FUNCOFFSET = &H26 '注入代码线程函数偏移量
Private mlShellCode(SHELL_CODE_DWORDLEN - 1) As Long

Private m_lHookID As Long '键盘钩子句柄
'============================================
' 锁定/解锁键盘
' 参数：布尔型，真表示锁定
' 返回：布尔型, 真表示成功
' 注意：非 Ctrl+Alt+Del 键使用普通钩子技术，因此
' 程序在退出时注意要卸载钩子。
'============================================
Public Function LockKeyboard(ByVal bLock As Boolean) As Boolean
Dim lResult As Long
Dim lStrPtr As Long
lStrPtr = StrPtr(SHELL_FALG)
lResult = GlobalFindAtom(lStrPtr)
If lResult = 0 Then
lResult = InsertAsmCode
Debug.Assert lResult = 0
If lResult Then Exit Function
End If

lStrPtr = StrPtr(ATOM_FLAG)
lResult = GlobalFindAtom(lStrPtr)
If bLock Then
m_lHookID = SetWindowsHookEx(13, AddressOf LowLevelKeyboardProc, App.hInstance, 0)
If (lResult = 0 And m_lHookID <> 0) Then lResult = GlobalAddAtom(lStrPtr)
LockKeyboard = (lResult <> 0 And m_lHookID <> 0)
Debug.Assert LockKeyboard
Else
Call UnhookWindowsHookEx(m_lHookID)
If lResult Then lResult = GlobalDeleteAtom(lResult)
LockKeyboard = (lResult <> 0)
End If
End Function
Public Function GetKeyboardState() As Boolean
GetKeyboardState = GlobalFindAtom(StrPtr(ATOM_FLAG)) <> 0
End Function

Private Function LowLevelKeyboardProc(ByVal nCode As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
If nCode >= 0 Then
'在这里可以加入实际的过滤条件
LowLevelKeyboardProc = 1
Else
LowLevelKeyboardProc = CallNextHookEx(m_lHookID, nCode, wParam, lParam)
End If
End Function
'----------------------------------------------
' 远程线程插入函数
' 功能：向 Winlogon 进程插入远程线程代码，并执行
' 返回：0 表示成功，非 0 为标准的错误代号(此错误
' 代码为远程线程返回的错误)
'----------------------------------------------
Private Function InsertAsmCode() As Long
Const WINLOGON As String = "Winlogon.exe"
Dim hProcess As Long '远端进程句柄
Dim hPId As Long '远端进程ID
Dim lResult As Long '一般返回变量
Dim pToken As TOKEN_PRIVILEGES
Dim hToken As Long
Dim hRemoteThread As Long
Dim hRemoteThreadID As Long
Dim lDbResult(1) As Long
Dim lRemoteAddr As Long

'------------------------------------
'取winlogon进程ID
'------------------------------------
hPId = GetProcessIdFromName(WINLOGON)
If hPId = 0 Then
Debug.Assert False
Exit Function
End If

'------------------------------------
'提升本进程权限，以取得对winlogon进程操作的许可
'------------------------------------
lResult = OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES Or TOKEN_QUERY, hToken)
Debug.Assert lResult
lResult = LookupPrivilegeValue(0, StrPtr(SE_DEBUG_NAME), pToken.Privileges.pLuid)
Debug.Assert lResult
pToken.PrivilegeCount = 1
pToken.Privileges.Attributes = SE_PRIVILEGE_ENABLED
lResult = AdjustTokenPrivileges(hToken, False, pToken, Len(pToken), 0, 0)
Debug.Assert lResult

'请看下一篇

模块代码太多字体了,请到我的博客看第二篇
http://hi.baidu.com/starwork/blog/item/609ea12b4b5d7efbe6cd4086.html

Answer 2

加个FALSE试试