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

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C++

printing

Hello,

I have followed instructions in msdn to change at runtime a printer paper size configuration in my application (http://support.microsoft.com/?scid=kb;en-us;140285&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.rzetelny/DropBox#5497051130735465906).

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;
}</stdio.h></windows.h>