HOW TO: Set Duplex Printing for Word Automation

From Support

This article was previously published under Q230743

Summary

Microsoft Word for Windows does not provide a method for Automation clients to set the duplex print flag before starting a print job. Although there is a parameter in the PrintOut method that indicates support for duplex printing, the parameter does not provide true duplex printing and may not be available depending on your operating system or installed language. However, developers can work around this limitation on Windows systems by changing the duplex flag for the active printer driver before calling Word's PrintOut function.

This article demonstrates how to use the Windows API to change the duplex setting of the active printer and allow a Word document to be printed in duplex.

More Information

This code uses the DocumentProperties API to change the print settings of the printer driver to enable duplex printing. For this code to work successfully, the end user will need adequate permissions to change the global print settings for the printer. If a user does not have the proper permission to change driver settings, they will get an Access Denied error on the OpenPrinter API call.

For users of Microsoft Windows NT and Microsoft Windows 2000 who need to print to a shared network printer, this can be a problem because the print driver does not reside on the local machine but on the print server. Although it is possible for an administrator to configure the print server to give end users the proper permission to change global settings, it is NOT desirable to do so in most cases. To work around this problem, it is possible to install a local print driver for the network printer, and let each user control the settings for their local systems. Steps to Add Local Print Driver for Network Printer on Windows NT and Windows 2000 1.One the Start menu, select Settings, then select Printers and double-click Add Printer to bring up the Add Printer wizard.

2.When prompted, select printer from "My Computer" and NOT from the network. Although you will connect to a network printer, you want to use a driver on My Computer. Press Next to continue.

3.Click on "Add Port."

4.Select Local Port in the drop-down list box and then click New Port.

5.Type the location of the printer on the network. For example: \\printserver\printername (using the exact path name to the printer)

6. Select OK and continue with the rest of the setup. Changing the printer properties for the active printer will affect all applications that use that printer, and not just Word. If you plan on changing the setting for a particular print job, make sure you restore the setting when the job is complete. Steps to Build the Sample

1.Open Visual Basic and create a new project. Form1 is created by default. 2.Add a standard BAS module to the project and add the following code to the module's code window:

 
 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 And 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


		 		 		 		 		 
3.	On Form1, add a standard Command Button. 
4.	Add the following code to the code window for Form1:
   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

5.Run the sample. If you have a printer that supports duplex printing, the test document should print on both sides of the page.