strUser = "guests"
strPath = "D:\\abc.txt"
RetVal = AddPermission(strUser,strPath,"R",True)

'-------------------------------------------------------------------------

'用于给文件和文件夹添加一条权限设置.返回值: 0-成功,1-账户不存在,2-路径不存在
'strUser表示用户名或组名
'strPath表示文件夹路径或文件路径
'strAccess表示允许权限设置的字符串,字符串中带有相应字母表示允许相应权限: R-读,C-读写,F-完全控制
'blInherit表示是否继承父目录权限.True为继承,False为不继承

Function AddPermission(strUser,strPath,strAccess,blInherit)
        Set objWMIService = GetObject("winmgmts:\\.\root\Cimv2")
        Set fso = CreateObject("Scripting.FileSystemObject")
        '得到Win32_SID并判断用户/组/内置账户是否存在
        Set colUsers = objWMIService.ExecQuery("SELECT * FROM Win32_Account WHERE Name='"&strUser&"'")
        If colUsers.count<>0 Then
                For Each objUser In colUsers
                        strSID = objUser.SID
                Next
        Else
                AddPermission = 1
                Exit Function
        End If
        Set objSID = objWMIService.Get("Win32_SID.SID='"&strSID&"'")
        '判断文件/文件夹是否存在
        pathType = ""
        If fso.fileExists(strPath) Then pathType = "FILE"
        If fso.folderExists(strPath) Then pathType = "FOLDER"
        If pathType = "" Then
                AddPermission = 2
                Exit Function
        End If
        '设置Trustee
        Set objTrustee = objWMIService.Get("Win32_Trustee").SpawnInstance_()
        objTrustee.Domain = objSID.ReferencedDomainName
        objTrustee.Name = objSID.AccountName
        objTrustee.SID = objSID.BinaryRepresentation
        objTrustee.SidLength = objSID.SidLength
        objTrustee.SIDString = objSID.Sid
        '设置ACE
        Set objNewACE = objWMIService.Get("Win32_ACE").SpawnInstance_()
        objNewACE.Trustee = objTrustee
        objNewACE.AceType = 0
        If InStr(UCase(strAccess),"R") > 0 Then objNewACE.AccessMask = 1179817
        If InStr(UCase(strAccess),"C") > 0 Then objNewACE.AccessMask = 1245631
        If InStr(UCase(strAccess),"F") > 0 Then objNewACE.AccessMask = 2032127
        If pathType = "FILE" And blInherit = True Then objNewACE.AceFlags = 16
        If pathType = "FILE" And blInherit = False Then objNewACE.AceFlags = 0
        If pathType = "FOLDER" And blInherit = True Then objNewACE.AceFlags = 19
        If pathType = "FOLDER" And blInherit = False Then objNewACE.AceFlags = 3
        '设置SD
        Set objFileSecSetting = objWMIService.Get("Win32_LogicalFileSecuritySetting.Path='"&strPath&"'")
        Call objFileSecSetting.GetSecurityDescriptor(objSD)
        blSE_DACL_AUTO_INHERITED = True
        If (objSD.ControlFlags And &H400) = 0 Then
                blSE_DACL_AUTO_INHERITED = False
                objSD.ControlFlags = (objSD.ControlFlags Or &H400)               
    '自动继承位置位,如果是刚创建的目录或文件该位是不置位的,需要置位
        End If
        If blInherit = True Then
                objSD.ControlFlags = (objSD.ControlFlags And &HEFFF)       
    '阻止继承复位
        Else
                objSD.ControlFlags = (objSD.ControlFlags Or &H1400)               
    '阻止继承位置位,自动继承位置位
        End If
        objOldDacl = objSD.Dacl
        ReDim objNewDacl(0)
        Set objNewDacl(0) = objNewACE
        If IsArray(objOldDacl) Then               
  '权限为空时objOldDacl不是集合不可遍历
                For Each objACE In objOldDacl
                        If (blSE_DACL_AUTO_INHERITED=False And blInherit=True) Or ((objACE.AceFlags And 16)>0 And (blInherit=True) Or (LCase(objACE.Trustee.Name)=LCase(strUser))) Then
                                'Do nothing
                                '当自动继承位置位为0时即使时继承的权限也会显示为非继承,这时所有权限都不设置
                                '当自动继承位置位为0时,在继承父目录权限的情况下不设置继承的权限.账户和需要加权限的账户一样时不设置权限
                        Else
                                Ubd = UBound(objNewDacl)
                                ReDim preserve objNewDacl(Ubd+1)
                                Set objNewDacl(Ubd+1) = objACE
                        End If
                Next
        End If

        objSD.Dacl = objNewDacl
        '提交设置修改
        Call objFileSecSetting.SetSecurityDescriptor(objSD)
        AddPermission = 0
        Set fso = Nothing
End Function