Turning Duplex Printing off?

Hi
I'm tearing my hair out trying to get the following code running...well actually it runs but duplex printing is not turned on.

I have been running it on a Win 98 machine that is on an NT4 network. The code runs until the end BUT I get two pages of printed material instead of one page with two sides.

This code is straight from the Microsoft site so I figured it should work :). I have even tried it on a Non-duplex printer to check that it would pick this fact up but it seems to be happy even with a non duplex printer ie doesn't error as the code suggests it should because the p[rinter doesn't support duplex printing.

If anyone can help I would be most gratefull




Option Explicit

Public Type PRINTER_DEFAULTS

pDatatype As Long
pDevmode As Long
DesiredAccess As Long
End Type

Public Type PRINTER_INFO_2
pServerName As Long
pPrinterName As Long
pShareName As Long
pPortName As Long
pDriverName As Long
pComment As Long
pLocation As Long
pDevmode As Long ' Pointer to DEVMODE
pSepFile As Long
pPrintProcessor As Long
pDatatype As Long
pParameters As Long
pSecurityDescriptor As Long ' Pointer to SECURITY_DESCRIPTOR
Attributes As Long


Priority As Long
DefaultPriority As Long
StartTime As Long
UntilTime As Long
Status As Long
cJobs As Long
AveragePPM As Long
End Type

Public Type DEVMODE
dmDeviceName As String * 32

dmSpecVersion As Integer
dmDriverVersion As Integer
dmSize As Integer
dmDriverExtra As Integer
dmFields As Long
dmOrientation As Integer
dmPaperSize As Integer
dmPaperLength As Integer
dmPaperWidth As Integer
dmScale As Integer
dmCopies As Integer
dmDefaultSource As Integer
dmPrintQuality As Integer
dmColor As Integer
dmDuplex As Integer
dmYResolution As Integer
dmTTOption As Integer
dmCollate As Integer
dmFormName As String * 32
dmUnusedPadding As Integer
dmBitsPerPel As Integer
dmPelsWidth As Long
dmPelsHeight As Long
dmDisplayFlags As Long
dmDisplayFrequency As Long
dmICMMethod As Long
dmICMIntent As Long
dmMediaType As Long
dmDitherType As Long
dmReserved1 As Long
dmReserved2 As Long
End Type

Public Const DM_DUPLEX = &H1000&
Public Const DM_IN_BUFFER = 8

Public Const DM_OUT_BUFFER = 2
Public Const PRINTER_ACCESS_ADMINISTER = &H4
Public Const PRINTER_ACCESS_USE = &H8
Public Const STANDARD_RIGHTS_REQUIRED = &HF0000
Public Const PRINTER_ALL_ACCESS = (STANDARD_RIGHTS_REQUIRED Or _
PRINTER_ACCESS_ADMINISTER Or PRINTER_ACCESS_USE)

Public Declare Function ClosePrinter Lib "winspool.drv" _
(ByVal hPrinter As Long) As Long
Public Declare Function DocumentProperties Lib "winspool.drv" _
Alias "DocumentPropertiesA" (ByVal hwnd As Long, _
ByVal hPrinter As Long, ByVal pDeviceName As String, _
ByVal pDevModeOutput As Long, ByVal pDevModeInput As Long, _
ByVal fMode As Long) As Long
Public Declare Function GetPrinter Lib "winspool.drv" Alias _
"GetPrinterA" (ByVal hPrinter As Long, ByVal Level As Long, _
pPrinter As Byte, ByVal cbBuf As Long, pcbNeeded As Long) As Long
Public Declare Function OpenPrinter Lib "winspool.drv" Alias _
"OpenPrinterA" (ByVal pPrinterName As String, phPrinter As Long, _
pDefault As PRINTER_DEFAULTS) As Long
Public Declare Function SetPrinter Lib "winspool.drv" Alias _
"SetPrinterA" (ByVal hPrinter As Long, ByVal Level As Long, _
pPrinter As Byte, ByVal Command As Long) As Long

Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" _
(pDest As Any, pSource As Any, ByVal cbLength As Long)

' ==================================================================
' SetPrinterDuplex
'
' Programmatically set the Duplex flag for the specified printer
' driver's default properties.
'
' Returns: True on success, False on error. (An error will also

' display a message box. This is done for informational value
' only. You should modify the code to support better error
' handling in your production application.)
'
' Parameters:
' sPrinterName - The name of the printer to be used.
'
' nDuplexSetting - One of the following standard settings:
' 1 = None
' 2 = Duplex on long edge (book)
' 3 = Duplex on short edge (legal)
'
' ==================================================================
Public Function SetPrinterDuplex(ByVal sPrinterName As String, _

ByVal nDuplexSetting As Long) As Boolean

Dim hPrinter As Long
Dim pd As PRINTER_DEFAULTS
Dim pinfo As PRINTER_INFO_2
Dim dm As DEVMODE

Dim yDevModeData() As Byte
Dim yPInfoMemory() As Byte
Dim nBytesNeeded As Long
Dim nRet As Long, nJunk As Long

On Error GoTo cleanup

If (nDuplexSetting < 1) Or (nDuplexSetting > 3) Then
MsgBox "Error: dwDuplexSetting is incorrect."
Exit Function
End If

pd.DesiredAccess = PRINTER_ALL_ACCESS
nRet = OpenPrinter(sPrinterName, hPrinter, pd)
If (nRet = 0) Or (hPrinter = 0) Then
If Err.LastDllError = 5 Then
MsgBox "Access denied -- See the article for more info."
Else
MsgBox "Cannot open the printer specified " & _
"(make sure the printer name is correct)."
End If
Exit Function
End If

nRet = DocumentProperties(0, hPrinter, sPrinterName, 0, 0, 0)
If (nRet < 0) Then
MsgBox "Cannot get the size of the DEVMODE structure."
GoTo cleanup
End If

ReDim yDevModeData(nRet + 100) As Byte
nRet = DocumentProperties(0, hPrinter, sPrinterName, _
VarPtr(yDevModeData(0)), 0, DM_OUT_BUFFER)
If (nRet < 0) Then
MsgBox "Cannot get the DEVMODE structure."
GoTo cleanup
End If

Call CopyMemory(dm, yDevModeData(0), Len(dm))

If Not CBool(dm.dmFields & DM_DUPLEX) Then
MsgBox "You cannot modify the duplex flag for this printer " & _
"because it does not support duplex or the driver " & _
"does not support setting it from the Windows API."
GoTo cleanup
End If

dm.dmDuplex = nDuplexSetting
Call CopyMemory(yDevModeData(0), dm, Len(dm))

nRet = DocumentProperties(0, hPrinter, sPrinterName, _
VarPtr(yDevModeData(0)), VarPtr(yDevModeData(0)), _
DM_IN_BUFFER Or DM_OUT_BUFFER)

If (nRet < 0) Then
MsgBox "Unable to set duplex setting to this printer."
GoTo cleanup
End If

Call GetPrinter(hPrinter, 2, 0, 0, nBytesNeeded)
If (nBytesNeeded = 0) Then GoTo cleanup

ReDim yPInfoMemory(nBytesNeeded + 100) As Byte

nRet = GetPrinter(hPrinter, 2, yPInfoMemory(0), nBytesNeeded, nJunk)
If (nRet = 0) Then
MsgBox "Unable to get shared printer settings."
GoTo cleanup
End If

Call CopyMemory(pinfo, yPInfoMemory(0), Len(pinfo))
pinfo.pDevmode = VarPtr(yDevModeData(0))
pinfo.pSecurityDescriptor = 0
Call CopyMemory(yPInfoMemory(0), pinfo, Len(pinfo))

nRet = SetPrinter(hPrinter, 2, yPInfoMemory(0), 0)
If (nRet = 0) Then
MsgBox "Unable to set shared printer settings."
End If

SetPrinterDuplex = CBool(nRet)

cleanup:
If (hPrinter <> 0) Then Call ClosePrinter(hPrinter)

End Function

Option Explicit

Private Sub Command1_Click()
Dim oWord As Object
Dim oDoc As Object

Set oWord = CreateObject("Word.application")

oWord.Visible = True

Set oDoc = oWord.Documents.Add
oDoc.Range.Select


oWord.Selection.TypeText "This is on page 1" & vbCr
oWord.Selection.InsertBreak 1
oWord.Selection.TypeText "This is page 2"

SetPrinterDuplex Printer.DeviceName, 2

oDoc.PrintOut Background:=False

SetPrinterDuplex Printer.DeviceName, 1

MsgBox "Print Done", vbMsgBoxSetForeground

oDoc.Saved = True
oDoc.Close
Set oDoc = Nothing

oWord.Quit
Set oWord = Nothing
End Sub