Question

Je cherche un moyen de trouver le nom de l’imprimante par défaut Windows à l’aide de C ++ non géré (beaucoup d’exemples .NET trouvés, mais aucun succès non géré). Merci.

Était-ce utile?

La solution

Ce qui suit est idéal pour imprimer avec le win32api de C ++

char szPrinterName[255];
unsigned long lPrinterNameLength;
GetDefaultPrinter( szPrinterName, &lPrinterNameLength );
HDC hPrinterDC;
hPrinterDC = CreateDC("WINSPOOL\0", szPrinterName, NULL, NULL);

Dans le futur au lieu de googler " unmanaged " essayez googler " win32 / subject / " ou "win32 api / subject /"

Autres conseils

Voici comment obtenir une liste des imprimantes actuelles et celle par défaut s'il en existe une définie par défaut.

Remarque: l'obtention de zéro pour le nom d'imprimante par défaut est valide si l'utilisateur ne possède pas d'imprimante ou n'en a pas définie une par défaut.

Le fait de pouvoir gérer des noms d'imprimante longs doit également être pris en charge. Par conséquent, si vous appelez GetDefaultPrinter avec NULL en tant que pointeur de tampon, vous obtiendrez la longueur du nom, puis vous pourrez allouer un tampon de nom suffisamment grand pour contenir le nom.

DWORD numprinters;
DWORD defprinter=0;
DWORD               dwSizeNeeded=0;
DWORD               dwItem;
LPPRINTER_INFO_2    printerinfo = NULL;

// Get buffer size

EnumPrinters ( PRINTER_ENUM_LOCAL | PRINTER_ENUM_CONNECTIONS , NULL, 2, NULL, 0, &dwSizeNeeded, &numprinters );

// allocate memory
//printerinfo = (LPPRINTER_INFO_2)HeapAlloc ( GetProcessHeap (), HEAP_ZERO_MEMORY, dwSizeNeeded );
printerinfo = (LPPRINTER_INFO_2)new char[dwSizeNeeded];

if ( EnumPrinters ( PRINTER_ENUM_LOCAL | PRINTER_ENUM_CONNECTIONS,      // what to enumerate
            NULL,           // printer name (NULL for all)
            2,              // level
            (LPBYTE)printerinfo,        // buffer
            dwSizeNeeded,       // size of buffer
            &dwSizeNeeded,      // returns size
            &numprinters            // return num. items
          ) == 0 )
{
    numprinters=0;
}

{
    DWORD size=0;   

    // Get the size of the default printer name.
    GetDefaultPrinter(NULL, &size);
    if(size)
    {
       // Allocate a buffer large enough to hold the printer name.
        TCHAR* buffer = new TCHAR[size];

          // Get the printer name.
        GetDefaultPrinter(buffer, &size);

        for ( dwItem = 0; dwItem < numprinters; dwItem++ )
        {
                          if(!strcmp(buffer,printerinfo[dwItem].pPrinterName))
                defprinter=dwItem;
        }
        delete buffer;
    }
}

Comment récupérer et définir l’imprimante par défaut sous Windows:

http://support.microsoft.com/default .aspx? scid = kb; FR-US; 246772

Code de l'article maintenant indisponible:

// You are explicitly linking to GetDefaultPrinter because linking 
// implicitly on Windows 95/98 or NT4 results in a runtime error.
// This block specifies which text version you explicitly link to.
#ifdef UNICODE
  #define GETDEFAULTPRINTER "GetDefaultPrinterW"
#else
  #define GETDEFAULTPRINTER "GetDefaultPrinterA"
#endif

// Size of internal buffer used to hold "printername,drivername,portname"
// string. You may have to increase this for huge strings.
#define MAXBUFFERSIZE 250

/*----------------------------------------------------------------*/ 
/* DPGetDefaultPrinter                                            */ 
/*                                                                */ 
/* Parameters:                                                    */ 
/*   pPrinterName: Buffer alloc'd by caller to hold printer name. */ 
/*   pdwBufferSize: On input, ptr to size of pPrinterName.        */ 
/*          On output, min required size of pPrinterName.         */ 
/*                                                                */ 
/* NOTE: You must include enough space for the NULL terminator!   */ 
/*                                                                */ 
/* Returns: TRUE for success, FALSE for failure.                  */ 
/*----------------------------------------------------------------*/ 
BOOL DPGetDefaultPrinter(LPTSTR pPrinterName, LPDWORD pdwBufferSize)
{
  BOOL bFlag;
  OSVERSIONINFO osv;
  TCHAR cBuffer[MAXBUFFERSIZE];
  PRINTER_INFO_2 *ppi2 = NULL;
  DWORD dwNeeded = 0;
  DWORD dwReturned = 0;
  HMODULE hWinSpool = NULL;
  PROC fnGetDefaultPrinter = NULL;

  // What version of Windows are you running?
  osv.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
  GetVersionEx(&osv);

  // If Windows 95 or 98, use EnumPrinters.
  if (osv.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
  {
    // The first EnumPrinters() tells you how big our buffer must
    // be to hold ALL of PRINTER_INFO_2. Note that this will
    // typically return FALSE. This only means that the buffer (the 4th
    // parameter) was not filled in. You do not want it filled in here.
    SetLastError(0);
    bFlag = EnumPrinters(PRINTER_ENUM_DEFAULT, NULL, 2, NULL, 0, &dwNeeded, &dwReturned);
    {
      if ((GetLastError() != ERROR_INSUFFICIENT_BUFFER) || (dwNeeded == 0))
        return FALSE;
    }

    // Allocate enough space for PRINTER_INFO_2.
    ppi2 = (PRINTER_INFO_2 *)GlobalAlloc(GPTR, dwNeeded);
    if (!ppi2)
      return FALSE;

    // The second EnumPrinters() will fill in all the current information.
    bFlag = EnumPrinters(PRINTER_ENUM_DEFAULT, NULL, 2, (LPBYTE)ppi2, dwNeeded, &dwNeeded, &dwReturned);
    if (!bFlag)
    {
      GlobalFree(ppi2);
      return FALSE;
    }

    // If specified buffer is too small, set required size and fail.
    if ((DWORD)lstrlen(ppi2->pPrinterName) >= *pdwBufferSize)
    {
      *pdwBufferSize = (DWORD)lstrlen(ppi2->pPrinterName) + 1;
      GlobalFree(ppi2);
      return FALSE;
    }

    // Copy printer name into passed-in buffer.
    lstrcpy(pPrinterName, ppi2->pPrinterName);

    // Set buffer size parameter to minimum required buffer size.
    *pdwBufferSize = (DWORD)lstrlen(ppi2->pPrinterName) + 1;
  }

  // If Windows NT, use the GetDefaultPrinter API for Windows 2000,
  // or GetProfileString for version 4.0 and earlier.
  else if (osv.dwPlatformId == VER_PLATFORM_WIN32_NT)
  {
    if (osv.dwMajorVersion >= 5) // Windows 2000 or later (use explicit call)
    {
      hWinSpool = LoadLibrary("winspool.drv");
      if (!hWinSpool)
        return FALSE;
      fnGetDefaultPrinter = GetProcAddress(hWinSpool, GETDEFAULTPRINTER);
      if (!fnGetDefaultPrinter)
      {
        FreeLibrary(hWinSpool);
        return FALSE;
      }

      bFlag = fnGetDefaultPrinter(pPrinterName, pdwBufferSize);
        FreeLibrary(hWinSpool);
      if (!bFlag)
        return FALSE;
    }

    else // NT4.0 or earlier
    {
      // Retrieve the default string from Win.ini (the registry).
      // String will be in form "printername,drivername,portname".
      if (GetProfileString("windows", "device", ",,,", cBuffer, MAXBUFFERSIZE) <= 0)
        return FALSE;

      // Printer name precedes first "," character.
      strtok(cBuffer, ",");

      // If specified buffer is too small, set required size and fail.
      if ((DWORD)lstrlen(cBuffer) >= *pdwBufferSize)
      {
        *pdwBufferSize = (DWORD)lstrlen(cBuffer) + 1;
        return FALSE;
      }

      // Copy printer name into passed-in buffer.
      lstrcpy(pPrinterName, cBuffer);

      // Set buffer size parameter to minimum required buffer size.
      *pdwBufferSize = (DWORD)lstrlen(cBuffer) + 1;
    }
  }

  // Clean up.
  if (ppi2)
    GlobalFree(ppi2);

  return TRUE;
}
#undef MAXBUFFERSIZE
#undef GETDEFAULTPRINTER


// You are explicitly linking to SetDefaultPrinter because implicitly
// linking on Windows 95/98 or NT4 results in a runtime error.
// This block specifies which text version you explicitly link to.
#ifdef UNICODE
  #define SETDEFAULTPRINTER "SetDefaultPrinterW"
#else
  #define SETDEFAULTPRINTER "SetDefaultPrinterA"
#endif

/*-----------------------------------------------------------------*/ 
/* DPSetDefaultPrinter                                             */ 
/*                                                                 */ 
/* Parameters:                                                     */ 
/*   pPrinterName: Valid name of existing printer to make default. */ 
/*                                                                 */ 
/* Returns: TRUE for success, FALSE for failure.                   */ 
/*-----------------------------------------------------------------*/ 
BOOL DPSetDefaultPrinter(LPTSTR pPrinterName)

{
  BOOL bFlag;
  OSVERSIONINFO osv;
  DWORD dwNeeded = 0;
  HANDLE hPrinter = NULL;
  PRINTER_INFO_2 *ppi2 = NULL;
  LPTSTR pBuffer = NULL;
  LONG lResult;
  HMODULE hWinSpool = NULL;
  PROC fnSetDefaultPrinter = NULL;

  // What version of Windows are you running?
  osv.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
  GetVersionEx(&osv);

  if (!pPrinterName)
    return FALSE;

  // If Windows 95 or 98, use SetPrinter.
  if (osv.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
  {
    // Open this printer so you can get information about it.
    bFlag = OpenPrinter(pPrinterName, &hPrinter, NULL);
    if (!bFlag || !hPrinter)
      return FALSE;

    // The first GetPrinter() tells you how big our buffer must
    // be to hold ALL of PRINTER_INFO_2. Note that this will
    // typically return FALSE. This only means that the buffer (the 3rd
    // parameter) was not filled in. You do not want it filled in here.
    SetLastError(0);
    bFlag = GetPrinter(hPrinter, 2, 0, 0, &dwNeeded);
    if (!bFlag)
    {
      if ((GetLastError() != ERROR_INSUFFICIENT_BUFFER) || (dwNeeded == 0))
      {
        ClosePrinter(hPrinter);
        return FALSE;
      }
    }

    // Allocate enough space for PRINTER_INFO_2.
    ppi2 = (PRINTER_INFO_2 *)GlobalAlloc(GPTR, dwNeeded);
    if (!ppi2)
    {
      ClosePrinter(hPrinter);
      return FALSE;
    }

    // The second GetPrinter() will fill in all the current information
    // so that all you have to do is modify what you are interested in.
    bFlag = GetPrinter(hPrinter, 2, (LPBYTE)ppi2, dwNeeded, &dwNeeded);
    if (!bFlag)
    {
      ClosePrinter(hPrinter);
      GlobalFree(ppi2);
      return FALSE;
    }

    // Set default printer attribute for this printer.
    ppi2->Attributes |= PRINTER_ATTRIBUTE_DEFAULT;
    bFlag = SetPrinter(hPrinter, 2, (LPBYTE)ppi2, 0);
    if (!bFlag)
    {
      ClosePrinter(hPrinter);
      GlobalFree(ppi2);
      return FALSE;
    }

    // Tell all open programs that this change occurred. 
    // Allow each program 1 second to handle this message.
    lResult = SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0L,
      (LPARAM)(LPCTSTR)"windows", SMTO_NORMAL, 1000, NULL);
  }

  // If Windows NT, use the SetDefaultPrinter API for Windows 2000,
  // or WriteProfileString for version 4.0 and earlier.
  else if (osv.dwPlatformId == VER_PLATFORM_WIN32_NT)
  {
    if (osv.dwMajorVersion >= 5) // Windows 2000 or later (use explicit call)
    {
      hWinSpool = LoadLibrary("winspool.drv");
      if (!hWinSpool)
        return FALSE;
      fnSetDefaultPrinter = GetProcAddress(hWinSpool, SETDEFAULTPRINTER);
      if (!fnSetDefaultPrinter)
      {
        FreeLibrary(hWinSpool);
        return FALSE;
      }

      bFlag = fnSetDefaultPrinter(pPrinterName);
      FreeLibrary(hWinSpool);
      if (!bFlag)
        return FALSE;
    }

    else // NT4.0 or earlier
    {
      // Open this printer so you can get information about it.
      bFlag = OpenPrinter(pPrinterName, &hPrinter, NULL);
      if (!bFlag || !hPrinter)
        return FALSE;

      // The first GetPrinter() tells you how big our buffer must
      // be to hold ALL of PRINTER_INFO_2. Note that this will
      // typically return FALSE. This only means that the buffer (the 3rd
      // parameter) was not filled in. You do not want it filled in here.
      SetLastError(0);
      bFlag = GetPrinter(hPrinter, 2, 0, 0, &dwNeeded);
      if (!bFlag)
      {
        if ((GetLastError() != ERROR_INSUFFICIENT_BUFFER) || (dwNeeded == 0))
        {
          ClosePrinter(hPrinter);
          return FALSE;
        }
      }

      // Allocate enough space for PRINTER_INFO_2.
      ppi2 = (PRINTER_INFO_2 *)GlobalAlloc(GPTR, dwNeeded);
      if (!ppi2)
      {
        ClosePrinter(hPrinter);
        return FALSE;
      }

      // The second GetPrinter() fills in all the current<BR/>
      // information.
      bFlag = GetPrinter(hPrinter, 2, (LPBYTE)ppi2, dwNeeded, &dwNeeded);
      if ((!bFlag) || (!ppi2->pDriverName) || (!ppi2->pPortName))
      {
        ClosePrinter(hPrinter);
        GlobalFree(ppi2);
        return FALSE;
      }

      // Allocate buffer big enough for concatenated string.
      // String will be in form "printername,drivername,portname".
      pBuffer = (LPTSTR)GlobalAlloc(GPTR,
        lstrlen(pPrinterName) +
        lstrlen(ppi2->pDriverName) +
        lstrlen(ppi2->pPortName) + 3);
      if (!pBuffer)
      {
        ClosePrinter(hPrinter);
        GlobalFree(ppi2);
        return FALSE;
      }

      // Build string in form "printername,drivername,portname".
      lstrcpy(pBuffer, pPrinterName);  lstrcat(pBuffer, ",");
      lstrcat(pBuffer, ppi2->pDriverName);  lstrcat(pBuffer, ",");
      lstrcat(pBuffer, ppi2->pPortName);

      // Set the default printer in Win.ini and registry.
      bFlag = WriteProfileString("windows", "device", pBuffer);
      if (!bFlag)
      {
        ClosePrinter(hPrinter);
        GlobalFree(ppi2);
        GlobalFree(pBuffer);
        return FALSE;
      }
    }

    // Tell all open programs that this change occurred. 
    // Allow each app 1 second to handle this message.
    lResult = SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0L, 0L,
      SMTO_NORMAL, 1000, NULL);
  }

  // Clean up.
  if (hPrinter)
    ClosePrinter(hPrinter);
  if (ppi2)
    GlobalFree(ppi2);
  if (pBuffer)
    GlobalFree(pBuffer);

  return TRUE;
}
#undef SETDEFAULTPRINTER

GetDefaultPrinter (MSDN) devrait faire l'affaire. Cela vous donnera le nom à transmettre à CreateDC pour impression.

Le C ++ non géré n'existe pas (et le C ++ géré est maintenant C ++ / CLI), si vous faites référence à C ++, l'utilisation de non géré en tant que balise est tout simplement triste ...

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