struct SQuestion {
    QString sQuestion;
    std::vector> vAnswers;
}

questionnaire_plugin:

* std::vector<SQuestion> m_vQuestions;

save code:

open file;

stream << question;
stream << nofanswers;

foreach(answer) { stream << answer.string << answer.bool }

load code:

open file;

while(!file.endOfStream())
{
    stream >> question;
    stream >> nofanswers;
    for(i = 0..nofanswers)
    {
        stream >> anwer.string >> answer.bool;
    }
}

browsing:

forward, backward, front, back
on_pForward_click()
{
    showQuestion(++m_iQuestion);
}

void showQuestion(int iQuestion, bool bEdit)
{
    m_ui.pQuestionLabel->setText(m_vQuestions[m_iQuestion].sQuestion);
    m_ui.pFrame->clear();
    for(int i = 0; i < m_vQuestions[m_iQuestion].vAnswers.size(); ++i)
    {
        QCheckBox* pCheckBox = new QCheckBox(m_vQuestions[m_iQuestion].vAnswers[i].first);
        pCheckBox->setChecked(m_vQuestions[m_iQuestion].vAnswers[i].second);
        m_ui.pFrame->addWidget(pCheckBox);
    }
}