is this what you need?

VB Code:
  1. Private Declare Function GetComName Lib "kernel32" Alias "GetComputerNameA" (ByVal lpBuffer As String, nSize As Long) As Long
  2.  
  3. Private Sub Command1_Click()
  4. Dim com_name As String
  5. Dim length As Long
  6.  
  7.     com_name = Space$(256)
  8.     length = Len(com_name)
  9.     GetComName com_name, length
  10.     com_name = Left$(com_name, length)
  11.  
  12.     MsgBox "[" & com_name & "]"
  13. End Sub