get computername

i know an API does that but i can just use it correctly.i will appreciate you showing me with some codes

VB Code:

'example by Donavon Kuhn ([email protected])
Private Const MAX_COMPUTERNAME_LENGTH As Long = 31
Private Declare Function GetComputerName Lib "kernel32" Alias "GetComputerNameA" (ByVal lpBuffer As String, nSize As Long) As Long
Private Sub Form_Load()
    Dim dwLen As Long
    Dim strString As String
    'Create a buffer
    dwLen = MAX_COMPUTERNAME_LENGTH + 1
    strString = String(dwLen, "X")
    'Get the computer name
    GetComputerName strString, dwLen
    'get only the actual data
    strString = Left(strString, dwLen)
    'Show the computer name
    MsgBox strString
End Sub