VB取得磁盘文件夹或文件的security

Option Explicit
Public Const MAXIMUM_ALLOWED As Long = &H2000000
Public Const DELETE As Long = &H10000
Public Const READ_CONTROL As Long = &H20000
Public Const WRITE_DAC As Long = &H40000
Public Const WRITE_OWNER As Long = &H80000
Public Const SYNCHRONIZE As Long = &H100000

Public Const STANDARD_RIGHTS_READ As Long = READ_CONTROL
Public Const STANDARD_RIGHTS_WRITE As Long = READ_CONTROL
Public Const STANDARD_RIGHTS_EXECUTE As Long = READ_CONTROL
Public Const STANDARD_RIGHTS_REQUIRED As Long = &HF0000

Public Const FILE_READ_DATA As Long = &H1        
Public Const FILE_LIST_DIRECTORY As Long = &H1     
Public Const FILE_ADD_FILE As Long = &H2        
Public Const FILE_WRITE_DATA As Long = &H2       
Public Const FILE_CREATE_PIPE_INSTANCE As Long = &H4  
Public Const FILE_ADD_SUBDIRECTORY As Long = &H4    
Public Const FILE_APPEND_DATA As Long = &H4     
Public Const FILE_READ_EA As Long = &H8        
Public Const FILE_READ_PROPERTIES As Long = FILE_READ_EA
Public Const FILE_WRITE_EA As Long = &H10       
Public Const FILE_WRITE_PROPERTIES As Long = FILE_WRITE_EA
Public Const FILE_EXECUTE As Long = &H20        
Public Const FILE_TRAVERSE As Long = &H20       
Public Const FILE_DELETE_CHILD As Long = &H40     
Public Const FILE_READ_ATTRIBUTES As Long = &H80     
Public Const FILE_WRITE_ATTRIBUTES As Long = &H100   

Public Const FILE_GENERIC_READ As Long = (STANDARD_RIGHTS_READ Or FILE_READ_DATA Or FILE_READ_ATTRIBUTES Or FILE_READ_EA Or FILE_EXECUTE Or STANDARD_RIGHTS_EXECUTE Or SYNCHRONIZE)
Public Const FILE_GENERIC_READ As Long = (STANDARD_RIGHTS_READ Or FILE_READ_DATA Or FILE_READ_ATTRIBUTES Or FILE_READ_EA Or SYNCHRONIZE)
Public Const FILE_GENERIC_EXECUTE As Long = (STANDARD_RIGHTS_EXECUTE Or FILE_READ_ATTRIBUTES Or FILE_EXECUTE Or SYNCHRONIZE)
Public Const FILE_GENERIC_WRITE As Long = (STANDARD_RIGHTS_WRITE Or FILE_WRITE_DATA Or FILE_WRITE_ATTRIBUTES Or FILE_WRITE_EA Or FILE_APPEND_DATA Or SYNCHRONIZE)
Public Const FILE_ALL_ACCESS As Long = (STANDARD_RIGHTS_REQUIRED Or SYNCHRONIZE Or &H1FF&)

Public Const GENERIC_READ As Long = &H80000000
Public Const GENERIC_WRITE As Long = &H40000000
Public Const GENERIC_EXECUTE As Long = &H20000000
Public Const GENERIC_ALL As Long = &H10000000

' Types, constants and functions to work with access rights
Public Const OWNER_SECURITY_INFORMATION As Long = &H1
Public Const GROUP_SECURITY_INFORMATION As Long = &H2
Public Const DACL_SECURITY_INFORMATION As Long = &H4
Public Const TOKEN_QUERY As Long = 8
Public Const SecurityImpersonation As Integer = 3
Public Const ANYSIZE_ARRAY = 1

Public Const ACEListDirectory = 1
Public Const ACEReadData = 1
Public Const ACECreateFiles = 2
Public Const ACEWriteData = 2
Public Const ACECreateDirectories = 4
Public Const ACEAppendData = 4
Public Const ACEReadExtendedAttributes = 8
Public Const ACEWriteExtendedAttributes = 16
Public Const ACEExecuteFile = 32
Public Const ACETraverse = 32
Public Const ACEDeleteSubdirectoriesAndFiles = 64
Public Const ACEReadAttributes = 128
Public Const ACEWriteAttributes = 256
'Public Const ACEWrite = 278
Public Const ACEDelete = 65536
Public Const ACEReadPermissions = 131072
'Public Const ACERead = 131209
'Public Const ACEReadAndExecute = 131241
'Public Const ACEModify = 197055
Public Const ACEChangePermissions = 262144
Public Const ACETakeOwnership = 524288
Public Const ACESynchronize = 1048576
'Public Const ACEFullControl = 2032127


Public Type GENERIC_MAPPING
  GenericRead As Long
  GenericWrite As Long
  GenericExecute As Long
  GenericAll As Long
End Type

Public Type LUID
  LowPart As Long
  HighPart As Long
End Type

Public Type LUID_AND_ATTRIBUTES
  pLuid As LUID
  Attributes As Long
End Type

Public Type PRIVILEGE_SET
  PrivilegeCount As Long
  Control As Long
  Privilege(ANYSIZE_ARRAY) As LUID_AND_ATTRIBUTES
End Type
Public Declare Function GetFileSecurity Lib "advapi32.dll" Alias "GetFileSecurityA" (ByVal lpFileName As String,ByVal RequestedInformation As Long, pSecurityDescriptor As Byte,ByVal nLength As Long, lpnLengthNeeded As Long) As Long
Public Declare Function AccessCheck Lib "advapi32.dll" (pSecurityDescriptor As Byte, ByVal ClientToken As Long,ByVal DesiredAccess As Long, GenericMapping As GENERIC_MAPPING,PrivilegeSet As PRIVILEGE_SET, PrivilegeSetLength As Long, GrantedAccess As Long, Status As Long) As Long
Public Declare Function ImpersonateSelf Lib "advapi32.dll" (ByVal ImpersonationLevel As Integer) As Long
Public Declare Function RevertToSelf Lib "advapi32.dll" () As Long
Public Declare Sub MapGenericMask Lib "advapi32.dll" (AccessMask As Long,GenericMapping As GENERIC_MAPPING)
Public Declare Function OpenThreadToken Lib "advapi32.dll"(ByVal ThreadHandle As Long, ByVal DesiredAccess As Long,ByVal OpenAsSelf As Long, TokenHandle As Long) As Long
Public Declare Function GetCurrentThread Lib "kernel32" () As Long
Public Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Public Type OSVERSIONINFO
  dwOSVersionInfoSize As Long
  dwMajorVersion As Long
  dwMinorVersion As Long
  dwBuildNumber As Long
  dwPlatformId As Long
  szCSDVersion As String * 128
End Type
Public Const VER_PLATFORM_WIN32_NT As Long = 2
Public Declare Function GetVersionEx Lib "kernel32" Alias "GetVersionExA" _
    (lpVersionInformation As OSVERSIONINFO) As Long
Public Const FS_PERSISTENT_ACLS As Long = &H8
Public Declare Function GetVolumeInformation Lib "kernel32" Alias "GetVolumeInformationA" (ByVal lpRootPathName As String,ByVal lpVolumeNameBuffer As String, ByVal nVolumeNameSize As Long,lpVolumeSerialNumber As Long, lpMaximumComponentLength As Long,lpFileSystemFlags As Long, ByVal lpFileSystemNameBuffer As String,ByVal nFileSystemNameSize As Long) As Long

’检查文件的访问权限
Public Function CheckFileAccess(fileName As String, ByVal DesiredAccess As Long) As Long
  Dim r As Long, SecDesc() As Byte, SDSize As Long, hToken As Long
  Dim PrivSet As PRIVILEGE_SET, GenMap As GENERIC_MAPPING
  Dim Volume As String, FSFlags As Long
  If Not IsNT() Then
    CheckFileAccess = -1
    Exit Function
  End If
  If Left$(fileName, 2) = "//" Then
    r = InStr(3, fileName, "/")
    If r = 0 Then
      Volume = fileName & "/"
    Else
      Volume = Left$(fileName, r)
    End If
  ElseIf Mid$(fileName, 2, 2) = ":/" Then
    Volume = Left$(fileName, 3)
  End If
  GetVolumeInformation Volume, vbNullString, 0, ByVal 0&, _
      ByVal 0&, FSFlags, vbNullString, 0
  If (FSFlags And FS_PERSISTENT_ACLS) = 0 Then
    CheckFileAccess = -1
    Exit Function
  End If
  GetFileSecurity fileName, OWNER_SECURITY_INFORMATION Or GROUP_SECURITY_INFORMATION Or DACL_SECURITY_INFORMATION, 0, 0, SDSize
  If Err.LastDllError <> 122 Then
    CheckFileAccess = -1   'Rights not supported. Returning -1.
    Exit Function
  End If
  If SDSize = 0 Then Exit Function
  ReDim SecDesc(1 To SDSize)
  If GetFileSecurity(fileName, OWNER_SECURITY_INFORMATION _
      Or GROUP_SECURITY_INFORMATION _
      Or DACL_SECURITY_INFORMATION, _
      SecDesc(1), SDSize, SDSize) = 0 Then
    Exit Function
  End If
  ImpersonateSelf SecurityImpersonation   'Adding Impersonation Token for thread
  OpenThreadToken GetCurrentThread(), TOKEN_QUERY, 0, hToken   'Opening of Token of current thread
  If hToken <> 0 Then
    GenMap.GenericRead = FILE_GENERIC_READ
    GenMap.GenericWrite = FILE_GENERIC_WRITE
    GenMap.GenericExecute = FILE_GENERIC_EXECUTE
    GenMap.GenericAll = FILE_ALL_ACCESS
    MapGenericMask DesiredAccess, GenMap
    AccessCheck SecDesc(1), hToken, DesiredAccess, GenMap, PrivSet, Len(PrivSet), CheckFileAccess, r
    CloseHandle hToken
  End If
  RevertToSelf
End Function