' Makes sure all variables are dimensioned in each subroutine.
Option Explicit
' Access the GetUserNameA function in advapi32.dll and
' call the function GetUserName.
Declare Function GetUserName Lib "advapi32.dll" Alias "GetUserNameA" _
(ByVal lpBuffer As String, nSize As Long) As Long
' Main routine to Dimension variables, retrieve user name
' and display answer.
Sub Get_User_Name()
' Dimension variables
Dim lpBuff As String * 25
Dim ret As Long, UserName As String
' Get the user name minus any trailing spaces found in the name.
ret = GetUserName(lpBuff, 25)
UserName = Left(lpBuff, InStr(lpBuff, Chr(0)) - 1)
' Display the User Name
MsgBox UserName
End Sub
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