Printer settings change at runtime not taken into account in my application...
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Thread: Printer settings change at runtime not taken into account in my application...

  1. #1
    Join Date
    Jul 2010
    Posts
    1

    Unhappy Printer settings change at runtime not taken into account in my application...

    Hello,

    I have followed instructions in msdn to change at runtime a printer paper size configuration in my application (http://support.microsoft.com/?scid=k...40285&x=12&y=8). I have replaced the dmOrientation option by the dmPaperSize to meet my need.

    All seems to execute fine (no error), but my new paper size is not taken into account until I manually validate the paper size from the printer options dialog box opened from the control panel. (Step 4 on the image http://picasaweb.google.com/stephane...51130735465906).

    To try to understand what I have missed, I have spy what's happened in file and registry when I execute the code snippet from msdn and when I validate the printer options dialog box with the incredible procmonitor.exe tool from sysinternal. Result is: there is no difference !!

    So I don't understand what I have missed !

    Any suggestion would be very appreciated.

    Regards.



    -------------------------------

    Here is the code sample :



    // TestPrinterDocSettings.cpp : Defines the entry point for the console application.

    //



    #include "stdafx.h"



    #include <windows.h>

    #include <stdio.h>





    int _iPaperCount = 0;

    WORD* _pPapers = NULL;

    char* _pPaperNames = NULL;

    POINT* _pPaperSizes = NULL;



    #define PRINTER_NAME "Receipt Printer"



    // Function that enumerates all available paper forms:

    void ListPapers()

    {

    HANDLE hPrinter = NULL;


    if (_pPapers)

    {

    delete [] _pPapers;

    _pPapers = NULL;

    }


    if (_pPaperNames)

    {

    delete [] _pPaperNames;

    _pPaperNames = NULL;

    }


    if (_pPaperSizes)

    {

    delete [] _pPaperSizes;

    _pPaperSizes = NULL;

    }


    if (OpenPrinter(PRINTER_NAME, &hPrinter, NULL))

    {

    DWORD dwNeeded = 0;


    // get printer forms

    _iPaperCount = DeviceCapabilities(PRINTER_NAME, NULL, DC_PAPERS, NULL, NULL);

    if (_iPaperCount)

    {

    _pPapers = new WORD[_iPaperCount];

    ZeroMemory(_pPapers, sizeof(WORD)*_iPaperCount);

    DeviceCapabilities(PRINTER_NAME, NULL, DC_PAPERS, (LPSTR) _pPapers, NULL);


    _pPaperNames = new char[_iPaperCount*64];

    ZeroMemory(_pPaperNames, sizeof(char)*64*_iPaperCount);

    DeviceCapabilities(PRINTER_NAME, NULL, DC_PAPERNAMES, _pPaperNames, NULL);


    for (int i = 0; i < _iPaperCount; i++)

    {

    printf("%d : %s\n", i, _pPaperNames+(i*64));

    }

    }


    ClosePrinter(hPrinter);

    }

    else

    {

    // report error

    printf("ListPapers : Unable to open printer %s. Error = %d\n", PRINTER_NAME, GetLastError());

    }

    }



    // MySetPrinter

    //

    // Demonstrates how to use the SetPrinter API.

    BOOL MySetPrinter(LPTSTR pPrinterName, short papersizenb, DWORD Level)

    {

    HANDLE hPrinter = NULL;

    DWORD dwNeeded = 0;

    BYTE *pi2 = NULL;

    DEVMODE *pDevMode = NULL;

    PRINTER_DEFAULTS pd;

    BOOL bFlag;

    LONG lFlag;



    // Open printer handle (on Windows NT, you need full-access because you

    // will eventually use SetPrinter)...

    ZeroMemory(&pd, sizeof(pd));

    pd.DesiredAccess = PRINTER_ALL_ACCESS;

    bFlag = OpenPrinter(pPrinterName, &hPrinter, &pd);

    if (!bFlag || (hPrinter == NULL))

    return FALSE;



    // The first GetPrinter tells you how big the buffer should be in

    // order to hold all of PRINTER_INFO_2. Note that this should fail with

    // ERROR_INSUFFICIENT_BUFFER. If GetPrinter fails for any other reason

    // or dwNeeded isn't set for some reason, then there is a problem...

    SetLastError(0);

    bFlag = GetPrinter(hPrinter, Level, 0, 0, &dwNeeded);

    if ((!bFlag) && (GetLastError() != ERROR_INSUFFICIENT_BUFFER) ||

    (dwNeeded == 0))

    {

    ClosePrinter(hPrinter);

    return FALSE;

    }



    // Allocate enough space for PRINTER_INFO_2...

    pi2 = (BYTE *)GlobalAlloc(GPTR, dwNeeded);


    if (pi2 == NULL)

    {

    ClosePrinter(hPrinter);

    return FALSE;

    }



    // The second GetPrinter fills in all the current settings, so all you

    // need to do is modify what you're interested in...

    bFlag = GetPrinter(hPrinter, Level, pi2, dwNeeded, &dwNeeded);

    if (!bFlag)

    {

    GlobalFree(pi2);

    ClosePrinter(hPrinter);

    return FALSE;

    }



    if (Level == 2)

    {

    pDevMode = ((PRINTER_INFO_2*)pi2)->pDevMode;

    }

    else if( Level == 8)

    {

    pDevMode = ((PRINTER_INFO_8*)pi2)->pDevMode;

    }

    else if (Level = 9)

    {

    pDevMode = ((PRINTER_INFO_9*)pi2)->pDevMode;

    }

    else

    {

    pDevMode = NULL;

    }





    // If GetPrinter didn't fill in the DEVMODE, try to get it by calling

    // DocumentProperties...

    if (pDevMode == NULL)

    {

    dwNeeded = DocumentProperties(NULL, hPrinter,

    pPrinterName,

    NULL, NULL, 0);

    if (dwNeeded <= 0)

    {

    GlobalFree(pi2);

    ClosePrinter(hPrinter);

    return FALSE;

    }



    pDevMode = (DEVMODE *)GlobalAlloc(GPTR, dwNeeded);

    if (pDevMode == NULL)

    {

    GlobalFree(pi2);

    ClosePrinter(hPrinter);

    return FALSE;

    }



    lFlag = DocumentProperties(NULL, hPrinter,

    pPrinterName,

    pDevMode, NULL,

    DM_OUT_BUFFER);

    if (lFlag != IDOK || pDevMode == NULL)

    {

    GlobalFree(pDevMode);

    GlobalFree(pi2);

    ClosePrinter(hPrinter);

    return FALSE;

    }

    }



    // Driver is reporting that it doesn't support this change...

    if (!(pDevMode->dmFields & DM_PAPERSIZE))

    {

    GlobalFree(pi2);

    ClosePrinter(hPrinter);

    if (pDevMode)

    GlobalFree(pDevMode);

    return FALSE;

    }



    // Specify exactly what we are attempting to change...

    if(papersizenb <= _iPaperCount)

    {

    pDevMode->dmPaperSize = _pPapers[papersizenb];

    }



    if(Level == 2)

    {

    // Do not attempt to set security descriptor...

    ((PRINTER_INFO_2*)pi2)->pSecurityDescriptor = NULL;

    }




    // Make sure the driver-dependent part of devmode is updated...

    lFlag = DocumentProperties(NULL, hPrinter,

    pPrinterName,

    pDevMode, pDevMode,

    DM_IN_BUFFER | DM_OUT_BUFFER);

    if (lFlag != IDOK)

    {

    GlobalFree(pi2);

    ClosePrinter(hPrinter);

    if (pDevMode)

    GlobalFree(pDevMode);

    return FALSE;

    }



    // Update printer information...

    bFlag = SetPrinter(hPrinter, Level, (LPBYTE)pi2, 0);

    if (!bFlag)

    // The driver doesn't support, or it is unable to make the change...

    {

    GlobalFree(pi2);

    ClosePrinter(hPrinter);

    if (pDevMode)

    GlobalFree(pDevMode);

    return FALSE;

    }



    // Tell other apps that there was a change...

    SendMessageTimeout(HWND_BROADCAST, WM_DEVMODECHANGE, 0L,

    (LPARAM)(LPCSTR)pPrinterName,

    SMTO_NORMAL, 1000, NULL);



    // Clean up...

    if (pi2)

    GlobalFree(pi2);

    if (hPrinter)

    ClosePrinter(hPrinter);

    if (pDevMode)

    GlobalFree(pDevMode);



    return TRUE;

    }





    int main(int argc, char* argv[])

    {

    // display all available papers size for the printer

    ListPapers();

    int papersizenb = 0;

    printf("Saisir le numero du format de papier a configurer sur l'imprimante : ");

    scanf("%d", &papersizenb);



    // change current properties of the printer

    MySetPrinter(PRINTER_NAME, papersizenb, 2);



    // change default properties of the printer

    MySetPrinter(PRINTER_NAME, papersizenb, 8);



    // change current user properties of the printer

    MySetPrinter(PRINTER_NAME, papersizenb, 9);



    printf("Appuyer sur une lettre + \"Entree\" pour continuer");

    scanf("%d", &papersizenb);



    return 0;

    }

  2. #2
    Join Date
    Feb 2005
    Posts
    2,160

    Re: Printer settings change at runtime not taken into account in my application...


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