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Setting the default printer programmatically in an MFC application

, 11 Jun 2002 CPOL
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How to change the default printer in MFC and save/restore this setting too/from the registry

Overview

In a standard MFC application the system wide default printer will be setup as default each time your application starts. This is done during your CWinApp objects initialisation, when it calls the function CWinApp::UpdatePrinterSelection(). This sets up the m_hDevMode and m_hDevNames global handles (as in global memory handles used with GlobalLock/Unlock) which CWinApp uses to manage the selected printer.

I have provided a wrapper class for enumPrinters, which is used to gather information on the locally installed printers which is needed when switching printers. It can also set the printers when called by a function in your CWinApp derived class and passing through m_hDevMode and m_hDevNames as references, so they can be changed.

When switching printers programmatically, you need to know:

  • The printers name e.g. HP Laserjet 4L
  • The port the printer is installed on e.g. LPT1:
  • The spooler that will dump the printout to the printer, usually winspool

Details

The class CEnumPrinters encapsulates the required functionality needed to query for the locally setup printers. This list can then be read/used to select new printers and set them as the new default printer to be used by the application.

Example list of printers

Restoring the selected printer

You can save the selected printer to the registry and restore it also. To do this, you need to place calls to CEnumPrinters::SavePrinterSelection() and CEnumPrinters::RestorePrinterSelection() in your applications ExitInstance and InitInstance procedures.

The information saved is:

  • The printer name
  • The spooling device
  • The port name
  • The page orientation (portrait or landscape)

Class interface

The following functions are used in the class:

  • int GetPrinterCount() ;
  • CString GetPrinterName(int index) ;
  • CString GetPrinterLocation(int index) ;
  • CString GetPrinterShareName(int index) ;
  • CString GetPrinterPortName(int index) ;
  • void ReadLocalPrinters() ;
  • The above functions enumerate the list of locally installed printers - automatically called in class constructor.

  • bool SetNewPrinter(HANDLE& hDevMode, HANDLE& hDevNames, const CString& PrinterName, const CString& PrinterSpooler, const CString& PrinterPort) ;
  • Use the function above when switching to a printer by Name, driver, port

  • bool SetNewPrinter(HANDLE& hDevMode, HANDLE& hDevNames, int index) ;
  • Use the function above when switching to a printer in the local list by index

  • bool SetPrintOrientation(HANDLE &hDevMode, int mode) ;
  • Use the above function switch between portrait and landscape page orientations.

  • bool SavePrinterSelection(HANDLE &hDevMode, HANDLE& hDevNames) ;
  • bool RestorePrinterSelection(HANDLE &hDevMode, HANDLE& hDevNames) ;
  • These procedures save/restore the selected printer from the registry (key PrinterConfig)

    Future enhancements or coding projects

  • Add functionality to query network printers
  • Add functionality to add a new printer
  • Enjoy!

    Revision History

    12 Jun 2002 - Initial Revision

    License

    This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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    About the Author

    Roger Allen
    Software Developer (Senior) Sirius Analytical Instruments
    United Kingdom United Kingdom
    A research and development programmer working for a pharmaceutical instrument company for the past 17 years.
     
    I am one of those lucky people who enjoys his work and spends more time than he should either doing work or reseaching new stuff. I can also be found on playing DDO on the Cannith server (Send a tell to "Maetrim" who is my current main)
     
    I am also a keep fit fanatic, doing cross country running and am seriously into [url]http://www.ryushinkan.co.uk/[/url] Karate at this time of my life, training from 4-6 times a week and recently achieved my 1st Dan after 6 years.

    Comments and Discussions

     
    GeneralEnumPrinters identifier not found Pinmemberbhat vinay20-Oct-10 3:11 
    QuestionWork with job ? PinmemberPAOS26-Feb-07 3:48 
    GeneralSet app to use non-default printer Pinmembertechjeff21-May-06 11:33 
    Thanks for the write up and the code. I have a challenge: I can't control the source code for the application. I want to set this application so that it will print to a "virtual printer" I installed in Windows. The virtual printer is something my company co-develops.
     
    Scenario:
    - My printer X is my Windows default printer
    - My printer Y is my weird dot matrix printer I use only with one application
    - I want my one application to use only the Y printer, to make it easier for computer illiterates to just "print", and they do so with the right printer.
     
    What do you recommend?
    - Are there any utilities that can start with my one program to force it to use only this printer (the non-default dot matrix printer)?
    - Can a utility be created to run and scan for a windows print event coming from the one program?
    - Are there any .INI modifications I could use?
    - Are there any other tweaks I can make in Windows?
     
    Your help is much appreciated. I Googled for 3 hours yesterday and couldn't find what I was looking for. I am not an expert in printing technology. Frown | :(
     

     
    Run to the hills!
    GeneralGreat Stuff !!! PinmemberWarren Stevens21-Aug-05 9:05 
    Generalneed to handle WM_SETTINGCHANGE Pinsussfredwobus23-May-05 5:37 
    GeneralDoesn't work in Unicode :( PinmemberVitalyTomilov31-Mar-05 4:27 
    GeneralUse Without Document/View Framwork Pinmemberrtek3-Mar-05 7:30 
    GeneralSet Default/Global Printer PinmemberDanYELL21-Sep-04 6:08 
    GeneralChanging printers. PinmemberJim Barrett5-Jul-04 3:00 
    GeneralCalling SetPrintOrientation PinmemberRtekRyan15-May-04 15:34 
    GeneralRe: Calling SetPrintOrientation PinmemberRoger Allen16-May-04 23:24 
    GeneralRe: Calling SetPrintOrientation Pinmemberrtek17-May-04 7:39 
    GeneralRe: Calling SetPrintOrientation PinmemberMr-X26-Nov-05 15:47 
    GeneralGreat Job! PinmemberFrank Kobs8-Mar-04 23:47 
    GeneralGreat Stuff !! PinmemberVijay Bansal5-Feb-04 6:30 
    GeneralGreat Job PinmemberJohnLI3-Oct-03 6:55 
    GeneralGod job PinmemberGodSaveMe3-Jul-03 4:07 
    GeneralGeting max paper PinmemberPezhvak30-Jan-03 0:39 
    GeneralUNICODE support Pinmembererand19-Dec-02 6:49 
    Questionset pagesize? Pinmemberwxzhao@gpi.com.cn12-Dec-02 17:20 
    GeneralEnumJobs cannot see multiple copies in Word2000 Pinsussrasho13-Oct-02 22:47 
    Generalservant of printers PinmemberXjenny_62-Oct-02 2:31 
    GeneralAddional functionality PinmemberRoger Allen30-May-02 1:26 
    QuestionNetworked Printers? PinmemberParesh Solanki8-May-02 1:35 
    AnswerRe: Networked Printers? PinmemberParesh Solanki8-May-02 1:37 
    GeneralRe: Networked Printers? PinmemberRoger Allen8-May-02 1:56 
    AnswerRe: Networked Printers? PinmemberRoger Allen8-May-02 1:55 
    AnswerRe: Networked Printers? Pinmemberchris17520-Feb-06 10:24 
    GeneralWin9x registry key PinmemberHockey6-May-02 16:20 
    GeneralRe: Win9x registry key PinmemberRoger Allen7-May-02 1:09 
    GeneralSetDefaultPrinter PinmemberJeremy Davis3-May-02 4:16 
    GeneralRe: SetDefaultPrinter PinmemberRoger Allen3-May-02 4:32 
    GeneralRe: SetDefaultPrinter PinmemberJeremy Davis3-May-02 4:36 
    GeneralRe: SetDefaultPrinter PinmemberNish [BusterBoy]3-May-02 4:38 
    GeneralRe: SetDefaultPrinter Pinmemberray Pezech28-May-02 10:13 
    GeneralRe: SetDefaultPrinter PinmemberJeremy Davis1-Nov-02 1:56 
    GeneralRe: SetDefaultPrinter Pinmembertingquan26-Mar-03 19:28 
    GeneralRe: SetDefaultPrinter PinmemberJeremy Davis26-Mar-03 22:54 
    GeneralNice piece of code PinmemberKarstenK3-May-02 2:25 
    GeneralRe: Nice piece of code PinmemberRoger Allen3-May-02 3:26 

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