Values of SQL_HANDLE_DBC

I would like to know the value of SQL_HANDLE_DBC and an explanation of the values I need to use for :

Private Declare Function SQLAllocHandle Lib "odbc32.dll" _
  (ByVal HandleType As Integer, _
   ByVal InputHandle As Long, _
   OutputHandlePtr As Long) As Integer

My statement is the following:rc = SQLAllocHandle(SQL_HANDLE_DBC, hdbc, hstmt)

What should the value of hdbc and hstmt be.