by Bhami Reddy (1 Submission)
Category: Windows API Call/Explanation
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Tue 27th March 2001
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
This code is useful when you are getting your logon user with domain name. This code is applicable for Windows NT and 9x.
API Declarations
Declare Function LookupAccountName Lib "advapi32.dll" Alias "LookupAccountNameA" (lpSystemName As String, ByVal lpAccountName As String, sid As Any, cbSid As Long, ByVal ReferencedDomainName As String, cbReferencedDomainName As Long, peUse As Long) As Long
VBcoders
Dim lResult As Long ' Result of various API calls.
Dim I As Integer ' Used in looping.
Dim bUserSid(255) As Byte ' This will contain your SID.
Dim sUserName As String
Dim sDomainName As String * 255 ' Domain the user belongs to.
Dim lDomainNameLength As Long ' Length of domain name needed.
Dim lSIDType As Long ' The type of SID info we are
' getting back.
' Get the SID of the user. (Refer to the MSDN for more information on SIDs
' and their function/purpose in the operating system.) Get the SID of this
' user by using the LookupAccountName API. In order to use the SID
' of the current user account, call the LookupAccountName API
' twice. The first time is to get the required sizes of the SID
' and the DomainName string. The second call is to actually get
' the desired information.
sUserName = GetLogonUser
lResult = LookupAccountName(vbNullString, sUserName, _
bUserSid(0), 255, sDomainName, lDomainNameLength, _
lSIDType)
' Now set the sDomainName string buffer to its proper size before
' calling the API again.
sDomainName = Space(lDomainNameLength)
' Call the LookupAccountName again to get the actual SID for user.
lResult = LookupAccountName(vbNullString, sUserName, _
bUserSid(0), 255, sDomainName, lDomainNameLength, _
lSIDType)
' Return value of zero means the call to LookupAccountName failed;
' test for this before you continue.
If (lResult = 0) Then
MsgBox "Error: Unable to Lookup the Current User Account: " _
& sUserName
Exit Function
End If
sDomainName = Left$(sDomainName, InStr(sDomainName, Chr$(0)) - 1)
GetLogonDomainuser = Trim(sDomainName) & "\" & sUserName
End Function
Private Function GetLogonUser() As String
Dim strTemp As String, strUserName As String
'Create a buffer
strTemp = String(100, Chr$(0))
'strip the rest of the buffer
strTemp = Left$(strTemp, InStr(strTemp, Chr$(0)) - 1)
'Create a buffer
strUserName = String(100, Chr$(0))
'Get the username
GetUserName strUserName, 100
'strip the rest of the buffer
strUserName = Left$(strUserName, InStr(strUserName, Chr$(0)) - 1)
GetLogonUser = strUserName
End Function
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