将多个默认打印机设置保存到数据文件

Question

我不确定提出这个问题的最佳位置，所以如果这是错误的论坛请告知。

我在用于保存打印机设置的MFC派生项目中有以下两种方法：

void CCommunityTalksApp::RestorePrinterSettings()
{
    DWORD       dwSize, dwVersion;
    LPVOID      lpData;
    DEVMODE     *pDevMode;
    HANDLE      hPrinter;
    CFile       fileIn;
    CString     strError, strTag;
    CWaitCursor wait;

    // open file
    if(!fileIn.Open(GetPRNPath(), CFile::modeRead | CFile::typeBinary))
    {
        // unable to open file
        return;
    }

    CArchive    ar(&fileIn, CArchive::load);

    ar >> strTag;
    if (strTag != _T("PTS-Printer Settings"))
    {
        // old-style printer file
        return;
    }
    ar >> dwVersion;

    // free existing memory and assign to NULL
    if(m_hDevMode != NULL)
    {
        ::GlobalFree(m_hDevMode);
        m_hDevMode = NULL;
    }

    if(m_hDevNames != NULL)
    {
        ::GlobalFree(m_hDevNames);
        m_hDevNames = NULL;
    }

    // read in size of m_hDevMode structure and the structure data
    ar >> dwSize;

    // allocate memory for the structure
    m_hDevMode = ::GlobalAlloc(GHND, dwSize);
    if(m_hDevMode != NULL)
    {
        lpData = ::GlobalLock(m_hDevMode);
        ar.Read(lpData, dwSize);
        ::GlobalUnlock(m_hDevMode);
    }

    // read in size of m_hDevNames structure and the structure data
    ar >> dwSize;

    // allocate memory for the structure
    m_hDevNames = ::GlobalAlloc(GHND, dwSize);
    if(m_hDevNames != NULL)
    {
        lpData = ::GlobalLock(m_hDevNames);
        ar.Read(lpData, dwSize);
        ::GlobalUnlock(m_hDevNames);
    }

    ar.Close();
    fileIn.Close();

    // we must now validate the printer settings
    if(m_hDevMode != NULL)
    {
        pDevMode = (DEVMODE*)::GlobalLock(m_hDevMode);

        if(!OpenPrinter((LPTSTR)(LPCTSTR)pDevMode->dmDeviceName, &hPrinter, NULL))
        {
            strError.Format(ID_STR_INVALIDPRINTER_TPL, pDevMode->dmDeviceName);
            if(AfxMessageBox(strError, MB_YESNO|MB_ICONQUESTION) == IDYES)
            {
                // delete settings file
                DeleteFile(theApp.GetPRNPath());
            }

            ::GlobalUnlock(m_hDevMode);
            // no printer found, so release memory and set to NULL
            if(m_hDevMode != NULL)
            {
                ::GlobalFree(m_hDevMode);
                m_hDevMode = NULL;
            }

            if(m_hDevNames != NULL)
            {
                ::GlobalFree(m_hDevNames);
                m_hDevNames = NULL;
            }
        }
        else
        {
            // printer settings must be OK
            ClosePrinter(hPrinter);
            ::GlobalUnlock(m_hDevMode);
        }
    }
}

void CCommunityTalksApp::SavePrinterSettings()
{
    CFile   fileOut;
    SIZE_T  dwSize;
    LPVOID  lpData;

    if(m_hDevMode == NULL && m_hDevNames == NULL)
    {
        // nothing to save
        return;
    }

    // create file
    if(!fileOut.Open(GetPRNPath(), CFile::modeCreate | CFile::modeWrite | CFile::typeBinary))
    {
        // unable to create printer file
        return;
    }

    CArchive    ar(&fileOut, CArchive::store);
    CString     strTag;

    strTag = _T("PTS-Printer Settings");

    ar << strTag;
    ar << (DWORD)100; // 1.00 (printer settings has it's own version number)

    // write out m_hDevMode size and structure
    if(m_hDevMode != NULL)
    {
        dwSize = ::GlobalSize(m_hDevMode);
        lpData = ::GlobalLock(m_hDevMode);

        BOOL bResetCopies = (BOOL)GetNumberSetting(
            _T("Preferences"),_T("ResetPrinterCopies"),FALSE);
        if (bResetCopies)
        {
            // Convert to DEVMODE structure and alter
            PDEVMODE pDevMode = (PDEVMODE)lpData;
            pDevMode->dmCopies = 1;
        }

        // write out size of structure
        ar << dwSize;

        // write out structure
        ar.Write(lpData, (UINT)dwSize);

        ::GlobalUnlock(m_hDevMode);
    }

    // write out m_hDevNames size and structure
    if(m_hDevNames != NULL)
    {
        dwSize = ::GlobalSize(m_hDevNames);
        lpData = ::GlobalLock(m_hDevNames);

        // write out size of structure
        ar << dwSize;

        // write out structure
        ar.Write(lpData, (UINT)dwSize);

        ::GlobalUnlock(m_hDevNames);
    }

    ar.Close();
    fileOut.Close();
}

上面的代码工作正常。问题是当用户在另一台计算机上安装程序时，该程序具有不同的打印机。

用户使用我程序中的功能备份数据文件，在另一台计算机上恢复。因此，打印机设置被覆盖，当您启动程序时，它会发出警告，重置打印机设置。

是否可以在数据文件中支持多个默认打印机设置？然后有能力启动，使用数据文件中的有效打印机？

如果我的问题不在话题，我会根据您的要求将其删除。