CreateFileA trigger invalid handle in win7

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  I have a program which use createfileA() to open a lan shared printer. It works fine in winxp. However, when run the program in Win7, it will produce "Invalid Handle" error.  Below is my code extracted:

      Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Integer, ByVal dwShareMode As Integer, <MarshalAs(UnmanagedType.Struct)> ByRef lpSecurityAttributes As SECURITY_ATTRIBUTES, ByVal dwCreationDisposition As Integer, ByVal dwFlagsAndAttributes As Integer, ByVal hTemplateFile As Integer) As Integer

          Dim hPortP As SafeHandle = Nothing

         Dim printerPath as String = \\199.198.2.1\SharedPrinter1"

          'Create connection
           hPortP = CreateFile(printerPath, GENERIC_WRITE, 0, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero)

  Any idea what is the cause and how to resolve it? Thanks.

  2010年7月21日 6:07