Binaryworld - How to take ownership of a file/folder ? ... [ VB -> Security ]

This sample article will show you how to get owner of a file/folder and how to take ownership of a file/folder?

Step-By-Step Example

- Create a standard exe project
- Add one module
- Add one textbox and one command button on the form1
- Add one ListView control on the form1. To add ListView control you need to add reference to Microsoft Windows Common Control 5.0 (Click Project->Components)
- Place the following code in form1 code window

Form1.frm

Click here to copy the following block

Private Sub Command1_Click()
  On Error GoTo errHandler

  ret = TakeOwnership(ListView1.SelectedItem.Text)
  If ret = 0 Then
    LoadListView
  Else
    MsgBox GetErrorMsg(Err.LastDllError)
  End If

  Exit Sub
errHandler:
  MsgBox Err.Description
End Sub

Private Sub Form_Load()
  Text1 = "C:\"
  Command1.Caption = "Take Ownership of selected file"
  Call LoadListView
End Sub
Sub LoadListView()
  Dim i As Integer
  Dim full_path As String
  Dim itmX As ListItem
  ListView1.ListItems.Clear
  ListView1.ColumnHeaders.Clear

  ChDir Text1
  file_name = Dir(Text1)

  With ListView1
    .View = lvwReport

    .ColumnHeaders.Add , , "File", ListView1.Width / 2
    .ColumnHeaders.Add , , "Owner (User/Group)"

    Do While file_name <> ""
      full_path = AddSlash(Text1) & file_name

      'ListItems are always shown in the first column.
      Set itmX = .ListItems.Add
      With itmX
        .Text = full_path
        .SubItems(1) = GetFileOwner(full_path)
      End With
      file_name = Dir$
    Loop
  End With
End Sub
Function AddSlash(fPath As String) As String
  If Right$(fPath, 1) = "\" Then
    AddSlash = fPath
  Else
    AddSlash = fPath & "\"
  End If
End Function

Add the folloing code in Module1

Module1.bas

Click here to copy the following block

Option Explicit
Option Base 0

Type ACE_HEADER
  AceType As Byte
  AceFlags As Byte
  AceSize As Long
End Type

Type ACL
  AclRevision As Byte
  Sbz1 As Byte
  AclSize As Integer
  AceCount As Integer
  Sbz2 As Integer
End Type

Type ACL_REVISION_INFORMATION
  AclRevision As Long
End Type

Type ACL_SIZE_INFORMATION
  AceCount As Long
  AclBytesInUse As Long
  AclBytesFree As Long
End Type

Type SECURITY_ATTRIBUTES
  nLength As Long
  lpSecurityDescriptor As Long
  bInheritHandle As Boolean
End Type

Type SECURITY_DESCRIPTOR
  Revision As Byte
  Sbz1 As Byte
  Control As Long
  Owner As Long
  Group As Long
  Sacl As ACL
  Dacl As ACL
End Type

Type SECURITY_QUALITY_OF_SERVICE
  Length As Long
  Impersonationlevel As Integer
  ContextTrackingMode As Integer
  EffectiveOnly As Boolean
End Type

Type SID_AND_ATTRIBUTES
  Sid As Long
  Attributes As Long
End Type
Type SID_IDENTIFIER_AUTHORITY
  Value(6) As Byte
End Type

Type LUID
  lowpart As Long
  highpart As Long
End Type

Type LUID_AND_ATTRIBUTES
  pLuid As LUID
  Attributes As Long
End Type

Public Const ANYSIZE_ARRAY = 1

Type TOKEN_GROUPS
  GroupCount As Long
  Groups(ANYSIZE_ARRAY) As SID_AND_ATTRIBUTES
End Type

Type TOKEN_PRIVILEGES
  PrivilegeCount As Long
  Privileges(ANYSIZE_ARRAY) As LUID_AND_ATTRIBUTES
End Type

Type LARGE_INTEGER
  lowpart As Long
  highpart As Long
End Type

Enum SE_OBJECT_TYPE
  SE_UNKNOWN_OBJECT_TYPE = 0&
  SE_FILE_OBJECT
  SE_SERVICE
  SE_PRINTER
  SE_REGISTRY_KEY
  SE_LMSHARE
  SE_KERNEL_OBJECT
  SE_WINDOW_OBJECT
  'SE_DS_OBJECT
  'SE_DS_OBJECT_ALL
  'SE_PROVIDER_DEFINED_OBJECT
End Enum

Declare Function SetSecurityDescriptorSacl Lib "advapi32.dll" _
    (pSecurityDescriptor As Any, _
    ByVal bSaclPresent As Long, _
    pSacl As ACL, _
    ByVal bSaclDefaulted As Long) As Long

'pSecurityDescriptor As SECURITY_DESCRIPTOR
Declare Function InitializeSecurityDescriptor Lib "advapi32.dll" _
    (pSecurityDescriptor As Any, _
    ByVal dwRevision As Long) As Long
'pSecurityDescriptor As SECURITY_DESCRIPTOR

Declare Function SetFileSecurity Lib "advapi32.dll" Alias "SetFileSecurityA" _
    (ByVal lpFileName As String, _
    ByVal SecurityInformation As Long, _
    pSecurityDescriptor As Any) As Long
'pSecurityDescriptor As SECURITY_DESCRIPTOR

Declare Function GetFileSecurity Lib "advapi32.dll" Alias "GetFileSecurityA" _
    (ByVal lpFileName As String, _
    ByVal RequestedInformation As Long, _
    pSecurityDescriptor As Any, _
    ByVal nLength As Long, _
    lpnLengthNeeded As Long) As Long

Declare Function AllocateAndInitializeSid Lib "advapi32.dll" _
    (pIdentifierAuthority As SID_IDENTIFIER_AUTHORITY, _
    ByVal nSubAuthorityCount As Byte, _
    ByVal nSubAuthority0 As Long, _
    ByVal nSubAuthority1 As Long, _
    ByVal nSubAuthority2 As Long, _
    ByVal nSubAuthority3 As Long, _
    ByVal nSubAuthority4 As Long, _
    ByVal nSubAuthority5 As Long, _
    ByVal nSubAuthority6 As Long, _
    ByVal nSubAuthority7 As Long, _
    lpPSid As Long) As Long

Declare Function SetSecurityDescriptorDacl Lib "advapi32.dll" _
    (pSecurityDescriptor As Any, _
    ByVal bDaclPresent As Long, _
    pDacl As Any, _
    ByVal bDaclDefaulted As Long) As Long
'pDacl As ACL pSecurityDescriptor As SECURITY_DESCRIPTOR

Declare Function SetSecurityDescriptorDaclNul Lib "advapi32.dll" Alias "SetSecurityDescriptorDacl" _
    (pSecurityDescriptor As Any, _
    ByVal bDaclPresent As Long, _
    ByVal pDacl As Long, _
    ByVal bDaclDefaulted As Long) As Long

'pDacl As ACL
'pSecurityDescriptor As SECURITY_DESCRIPTOR
Declare Function SetSecurityDescriptorGroup Lib "advapi32.dll" _
    (pSecurityDescriptor As Any, _
    pGroup As Any, _
    ByVal bGroupDefaulted As Long) As Long  ' pSecurityDescriptor As SECURITY_DESCRIPTOR

Declare Function SetSecurityDescriptorOwner Lib "advapi32.dll" _
    (pSecurityDescriptor As Any, _
    pOwner As Any, _
    ByVal bOwnerDefaulted As Long) As Long  'pSecurityDescriptor As SECURITY_DESCRIPTOR

Declare Function SetSecurityDescriptorOwnerPtr Lib "advapi32.dll" Alias "SetSecurityDescriptorOwner" _
    (pSecurityDescriptor As Any, _
    ByVal pOwner As Any, _
    ByVal bOwnerDefaulted As Long) As Long  'pSecurityDescriptor As SECURITY_DESCRIPTOR

Declare Function GetAce Lib "advapi32.dll" _
    (pAcl As ACL, _
    ByVal dwAceIndex As Long, _
    pAce As Any) As Long

Declare Function GetAclInformation Lib "advapi32.dll" _
    (pAcl As ACL, _
    pAclInformation As Any, _
    ByVal nAclInformationLength As Long, _
    ByVal dwAclInformationClass As Integer) As Long

Declare Function GetLengthSid Lib "advapi32.dll" _
    (pSid As Any) As Long

Declare Function GetSidIdentifierAuthority Lib "advapi32.dll" _
    (pSid As Any) As SID_IDENTIFIER_AUTHORITY

Declare Function GetSidLengthRequired Lib "advapi32.dll" _
    (ByVal nSubAuthorityCount As Byte) As Long

Declare Function GetSidSubAuthority Lib "advapi32.dll" _
    (pSid As Any, _
    ByVal nSubAuthority As Long) As Long

Declare Function GetSidSubAuthorityCount Lib "advapi32.dll" _
    (pSid As Any) As Byte

Declare Sub FreeSid Lib "advapi32.dll" (pSid As Any)
Declare Function OpenProcessToken Lib "advapi32.dll" _
    (ByVal ProcessHandle As Long, _
    ByVal DesiredAccess As Long, _
    TokenHandle As Long) As Long

Declare Function GetCurrentProcess Lib "kernel32" () As Long

Declare Function GetCurrentProcessId Lib "kernel32" () As Long

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

Declare Function LookupPrivilegeName Lib "advapi32.dll" Alias "LookupPrivilegeNameA" _
    (ByVal lpSystemName As String, _
    lpLuid As LARGE_INTEGER, _
    ByVal lpName As String, _
    cbName As Long) As Long

Declare Function LookupPrivilegeDisplayName Lib "advapi32.dll" Alias "LookupPrivilegeDisplayNameA" _
    (ByVal lpSystemName As String, _
    ByVal lpName As String, _
    ByVal lpDisplayName As String, _
    cbDisplayName As Long, _
    lpLanguageID As Long) As Long

Declare Function AdjustTokenPrivileges Lib "advapi32.dll" _
    (ByVal TokenHandle As Long, _
    ByVal DisableAllPrivileges As Long, _
    NewState As Any, _
    ByVal BufferLength As Long, _
    ByVal PreviousState As Long, _
    ByVal ReturnLength As Long) As Long
'PreviousState As TOKEN_PRIVILEGES 'NewState As TOKEN_PRIVILEGES

Declare Function AdjustTokenGroups Lib "advapi32.dll" _
    (ByVal TokenHandle As Long, _
    ByVal ResetToDefault As Long, _
    NewState As TOKEN_GROUPS, _
    ByVal BufferLength As Long, _
    PreviousState As TOKEN_GROUPS, _
    ReturnLength As Long) As Long

Declare Function GetVersion Lib "kernel32" () As Long

Declare Function GetNamedSecurityInfo Lib "advapi32.dll" Alias "GetNamedSecurityInfoA" ( _
    ByVal pObjectName As String, _
    ByVal ObjectType As SE_OBJECT_TYPE, _
    ByVal SecurityInfo As Long, _
    ppsidOwner As Long, _
    ppsidGroup As Long, _
    ppDacl As Long, _
    ppSacl As Long, _
    ppSecurityDescriptor As Long) As Long

Declare Function SetNamedSecurityInfo Lib "advapi32.dll" Alias "SetNamedSecurityInfoA" ( _
    ByVal pObjectName As String, _
    ByVal ObjectType As SE_OBJECT_TYPE, _
    ByVal SecurityInfo As Long, _
    ByVal psidOwner As Long, _
    ByVal psidGroup As Long, _
    ByVal pDacl As Long, _
    ByVal pSacl As Long) As Long

Declare Function GetLastError Lib "kernel32" () As Long

Declare Function FormatMessage Lib "kernel32" Alias "FormatMessageA" _
    (ByVal dwFlags As Long, _
    lpSource As Any, _
    ByVal dwMessageId As Long, _
    ByVal dwLanguageId As Long, _
    ByVal lpBuffer As String, _
    ByVal nSize As Long, _
    Arguments As Long) As Long

Public Const ACCESS_ALLOWED_ACE_TYPE = &H0
Public Const ACCESS_DENIED_ACE_TYPE = &H1
Public Const ACCESS_SYSTEM_SECURITY = &H1000000
Public Const ACL_REVISION = (2)
Public Const ACL_REVISION1 = (1)
Public Const ACL_REVISION2 = (2)
Public Const AclRevisionInformation = 1
Public Const AclSizeInformation = 2
Public Const SECURITY_ANONYMOUS_LOGON_RID = &H7
Public Const SECURITY_BATCH_RID = &H3
Public Const SECURITY_BUILTIN_DOMAIN_RID = &H20
Public Const SECURITY_CONTEXT_TRACKING = &H40000
Public Const SECURITY_CREATOR_GROUP_RID = &H1
Public Const SECURITY_CREATOR_OWNER_RID = &H0
Public Const SECURITY_DESCRIPTOR_MIN_LENGTH = (20)
Public Const SECURITY_DESCRIPTOR_REVISION = (1)
Public Const SECURITY_DESCRIPTOR_REVISION1 = (1)
Public Const SECURITY_EFFECTIVE_ONLY = &H80000
Public Const SECURITY_INTERACTIVE_RID = &H4
Public Const SECURITY_LOCAL_RID = &H0
Public Const SECURITY_LOCAL_SYSTEM_RID = &H12
Public Const SECURITY_LOGON_IDS_RID = &H5
Public Const SECURITY_NETWORK_RID = &H2
Public Const SECURITY_NT_NON_UNIQUE = &H15
Public Const SECURITY_NULL_RID = &H0
Public Const SECURITY_SERVICE_RID = &H6
Public Const SECURITY_SQOS_PRESENT = &H100000
Public Const SECURITY_VALID_SQOS_FLAGS = &H1F0000
Public Const SECURITY_WORLD_RID = &H0
Public Const SecurityAnonymous = 1
Public Const SecurityIdentification = 2
Public Const SECURITY_NULL_SID_AUTHORITY = 0
Public Const SECURITY_WORLD_SID_AUTHORITY = 1
Public Const SECURITY_LOCAL_SID_AUTHORITY = 2
Public Const SECURITY_CREATOR_SID_AUTHORITY = 3
Public Const SECURITY_NT_AUTHORITY As Long = 5&
Public Const DACL_SECURITY_INFORMATION As Long = &H4
Public Const DOMAIN_ALIAS_RID_ACCOUNT_OPS = &H224
Public Const DOMAIN_ALIAS_RID_ADMINS = &H220
Public Const DOMAIN_ALIAS_RID_BACKUP_OPS = &H227
Public Const DOMAIN_ALIAS_RID_GUESTS = &H222
Public Const DOMAIN_ALIAS_RID_POWER_USERS = &H223
Public Const DOMAIN_ALIAS_RID_PRINT_OPS = &H226
Public Const DOMAIN_ALIAS_RID_REPLICATOR = &H228
Public Const DOMAIN_ALIAS_RID_SYSTEM_OPS = &H225
Public Const DOMAIN_ALIAS_RID_USERS = &H221
Public Const DOMAIN_GROUP_RID_ADMINS = &H200
Public Const DOMAIN_GROUP_RID_GUESTS = &H202
Public Const DOMAIN_GROUP_RID_USERS = &H201
Public Const DOMAIN_USER_RID_ADMIN = &H1F4
Public Const DOMAIN_USER_RID_GUEST = &H1F5
Public Const SE_TAKE_OWNERSHIP_NAME = "SeTakeOwnershipPrivilege" & vbNullChar

Public Const SE_PRIVILEGE_ENABLED = &H2
Public Const ERROR_SUCCESS = 0&
Public Const TOKEN_ADJUST_PRIVILEGES = &H20
Public Const TOKEN_QUERY = &H8
Public Const OWNER_SECURITY_INFORMATION As Long = &H1&
Public Const FORMAT_MESSAGE_ALLOCATE_BUFFER = &H100
Public Const FORMAT_MESSAGE_ARGUMENT_ARRAY = &H2000
Public Const FORMAT_MESSAGE_FROM_HMODULE = &H800
Public Const FORMAT_MESSAGE_FROM_STRING = &H400
Public Const FORMAT_MESSAGE_FROM_SYSTEM = &H1000
Public Const FORMAT_MESSAGE_IGNORE_INSERTS = &H200
Public Const FORMAT_MESSAGE_MAX_WIDTH_MASK = &HFF
Public Const LANG_USER_DEFAULT = &H400&

'/////////////////////////////////////////////////////////////////////
'APIs to determine File/Folder Owner
'/////////////////////////////////////////////////////////////////////
Private Declare Function GetSecurityDescriptorOwner Lib "advapi32.dll" _
    (pSecurityDescriptor As Any, _
    pOwner As Long, _
    lpbOwnerDefaulted As Long) As Long

Private Declare Function LookupAccountSid Lib "advapi32.dll" _
    Alias "LookupAccountSidA" ( _
    ByVal lpSystemName As String, _
    ByVal Sid As Long, _
    ByVal name As String, _
    cbName As Long, _
    ByVal ReferencedDomainName As String, _
    cbReferencedDomainName As Long, _
    peUse As Long) As Long

Private Declare Function GetWindowsDirectory Lib "kernel32" _
    Alias "GetWindowsDirectoryA" ( _
    ByVal lpBuffer As String, _
    ByVal nSize As Long) As Long

Private Const ERROR_INSUFFICIENT_BUFFER = 122&
Private Const MAX_PATH = 255
'/////////////////////////////////////////////////////////////////////

Function AssertTakeOwnership(fEnable As Integer) As Integer
  Dim hToken As Long
  Dim TakeOwnershipValue As LUID
  Dim tkp As TOKEN_PRIVILEGES
  Dim result As Long
  Dim NulStr As String

  NulStr = Chr$(0)

  result = OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES Or TOKEN_QUERY, hToken)
  If fEnable Then
    result = LookupPrivilegeValue(NulStr, _
        SE_TAKE_OWNERSHIP_NAME, _
        TakeOwnershipValue)
    If result = False Then
      AssertTakeOwnership = False
    End If

    tkp.PrivilegeCount = 1
    tkp.Privileges(0).pLuid = TakeOwnershipValue
    tkp.Privileges(0).Attributes = SE_PRIVILEGE_ENABLED

    result = AdjustTokenPrivileges(hToken, _
        False, _
        tkp, _
        Len(tkp), _
        0&, _
        0&)
    ' * The return value of AdjustTokenPrivileges cannot
    ' * be tested.

    If (GetLastError() <> ERROR_SUCCESS) Then
      AssertTakeOwnership = False
    Else
      AssertTakeOwnership = True
    End If
  Else
    result = AdjustTokenPrivileges(hToken, _
        &HFFFF, _
        0&, _
        0&, _
        0&, _
        0&)

    ' * The return value of AdjustTokenPrivileges cannot
    ' * be tested.
    If (GetLastError() <> ERROR_SUCCESS) Then
      AssertTakeOwnership = False
    End If
  End If
End Function

Function OSIsNT() As Long

  Dim lngVersion As Long

  lngVersion = GetVersion()

  If ((lngVersion And &H80000000) = 0) Then
    OSIsNT = True
  Else
    OSIsNT = False
  End If

End Function

Public Function TakeOwnership(FilePath As String) As Long

'Return 0 If OK, else return error code

  Dim pSIDAliasAdmins As Long
  Dim result As Long, result2 As Long
  pSIDAliasAdmins = 0&

  Dim PACLptr As Long
  PACLptr = 0&

  Dim NulStr As String
  Dim sd As Long
  Dim Lneed As Long

  NulStr = Chr$(0)

  Dim siaNTAuthority As SID_IDENTIFIER_AUTHORITY
  siaNTAuthority.Value(5) = SECURITY_NT_AUTHORITY

  result = InitializeSecurityDescriptor(sd, SECURITY_DESCRIPTOR_REVISION)
  If result = 0 Then
    TakeOwnership = -1
    Exit Function
  End If

  result = SetSecurityDescriptorDaclNul(sd, -1&, 0&, 0&)
  If result = 0 Then
    TakeOwnership = -1
    Exit Function
  End If

  result = AllocateAndInitializeSid(siaNTAuthority, 2, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS, _
      0&, 0&, 0&, 0&, 0&, 0&, pSIDAliasAdmins)
  If result = False Then
    TakeOwnership = -1
    Exit Function
  End If

  'Set Owner
  result = SetNamedSecurityInfo( _
      FilePath & vbNullChar, _
      SE_FILE_OBJECT, _
      OWNER_SECURITY_INFORMATION, _
      pSIDAliasAdmins, _
      0&, _
      0&, _
      0&)

  If result <> 0 Then
    TakeOwnership = result
    FreeSid (pSIDAliasAdmins)
    Exit Function
  End If

  'Set File Security (Everyone Full control)
  result = SetFileSecurity(FilePath & vbNullChar, DACL_SECURITY_INFORMATION, sd)
  If result = 1 Then
    'Succeded
    TakeOwnership = 0
  Else
    TakeOwnership = 5
  End If
  'Free Buffer for sd and SID
  FreeSid (pSIDAliasAdmins)
End Function

Public Function GetFileOwner(Optional strPath As String) As String
  Dim szfilename As String  ' File name to retrieve the owner for
  Dim bSuccess As Long  ' Status variable
  Dim sizeSD As Long  ' Buffer size to store Owner's SID
  Dim pOwner As Long  ' Pointer to the Owner's SID
  Dim name As String  ' Name of the file owner
  Dim domain_name As String  ' Name of the first domain for the owner
  Dim name_len As Long  ' Required length for the owner name
  Dim domain_len As Long  ' Required length for the domain name
  Dim sdBuf() As Byte  ' Buffer for Security Descriptor
  Dim nLength As Long  ' Length of the Windows Directory
  Dim deUse As Long  ' Pointer to a SID_NAME_USE enumerated

' type indicating the type of the account

' Initialize some required variables.

  bSuccess = 0
  name = ""
  domain_name = ""
  name_len = 0
  domain_len = 0
  pOwner = 0

  'szfilename = Left$(szfilename, nLength) & "\notepad.exe"
  szfilename = strPath  '& vbNullChar
  name_len = Len(szfilename)
  ' Call GetFileSecurity the first time to obtain the size of the
  ' buffer required for the Security Descriptor.

  bSuccess = GetFileSecurity( _
      szfilename, _
      OWNER_SECURITY_INFORMATION, _
      0, _
      0&, _
      sizeSD)

  If (bSuccess = 0) And _
      (Err.LastDllError <> ERROR_INSUFFICIENT_BUFFER) Then
    'MsgBox "GetLastError returned : " & Err.LastDllError
    If Err.LastDllError = 1332 Then GetFileOwner = "{UNKNOWN}"
    Exit Function
  End If

  ' Create a buffer of the required size and call GetFileSecurity again.

  ReDim sdBuf(0 To sizeSD - 1) As Byte

  ' Fill the buffer with the security descriptor of the object specified
  ' by the szfilename parameter. The calling process must have the right
  ' to view the specified aspects of the object's security status.

  bSuccess = GetFileSecurity( _
      szfilename, _
      OWNER_SECURITY_INFORMATION, _
      sdBuf(0), _
      sizeSD, _
      sizeSD)

  If (bSuccess <> 0) Then

    ' Obtain the owner's SID from the Security Descriptor.
    '
    bSuccess = GetSecurityDescriptorOwner(sdBuf(0), pOwner, 0&)
    If (bSuccess = 0) Then
      'MsgBox "GetLastError returned : " & Err.LastDllError
      If Err.LastDllError = 1332 Then GetFileOwner = "{UNKNOWN}"
      Exit Function
    End If

    ' Retrieve the name of the account and the name of the first
    ' domain on which this SID is found. Passes in the Owner's SID
    ' obtained previously. Call LookupAccountSid twice, the first time
    ' to obtain the required size of the owner and domain names.

    bSuccess = LookupAccountSid(vbNullString, pOwner, name, name_len, _
        domain_name, domain_len, deUse)
    If (bSuccess = 0) And _
        (Err.LastDllError <> ERROR_INSUFFICIENT_BUFFER) Then
      If Err.LastDllError = 1332 Then GetFileOwner = "{UNKNOWN}"
      Exit Function
    End If

    ' Allocate the required space in the name and domain_name string
    ' variables. Allocate 1 byte less to avoid the appended NULL character.

    name = Space(name_len - 1)
    domain_name = Space(domain_len - 1)

    ' Call LookupAccountSid again to actually fill in the name of the owner
    ' and the first domain.

    bSuccess = LookupAccountSid(vbNullString, pOwner, name, name_len, _
        domain_name, domain_len, deUse)
    If bSuccess = 0 Then
      'MsgBox "GetLastError returned : " & Err.LastDllError
    End If

    'MsgBox "The Owner of " & szfilename & " is " & name
    GetFileOwner = name
  End If
End Function

Function GetErrorMsg(ByVal dwErrCode As Long) As String
  Static sMsgBuf As String * 257, dwLen As Long

  dwLen = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM _
      Or FORMAT_MESSAGE_IGNORE_INSERTS _
      Or FORMAT_MESSAGE_MAX_WIDTH_MASK, ByVal 0&, _
      dwErrCode, LANG_USER_DEFAULT, _
      ByVal sMsgBuf, 256&, 0&)

  If dwLen > 0 Then
    GetErrorMsg = Left$(sMsgBuf, dwLen)
  Else
    GetErrorMsg = "Unknown error message"
  End If
End Function

- Now Press F5 to run the project
- Select any file and click on the command button to take the Ownership of selected file

After you press command button ListView should refresh the owner of the file.