cap-7：QTIO（QDataStream读/写自定义类型）

struct ColorText
{
    ColorText() {}

    QString m_text;
    QColor m_color;
};
QDataStream& operator <<(QDataStream &dataStream, ColorText &colorText)
{
    dataStream << colorText.m_color << colorText.m_text;
    return dataStream;
}
QDataStream& operator >>(QDataStream &dataStream, ColorText &colorText)
{
    dataStream >> colorText.m_color >> colorText.m_text;
    return dataStream;
}

int main()
{
    ColorText colorText;
    colorText.m_color = Qt::red;
    colorText.m_text = "Red";

    QFile file("test.data");
    if(!file.open(QIODevice::ReadWrite))
    {
        qDebug() << "file open false!";
        return -1;
    }
    QDataStream dataStream(&file);
    dataStream << colorText;

    file.seek(0);
    dataStream >> colorText;
    qDebug() << colorText.m_text << colorText.m_color;

    return 0;
}

"Red" QColor(ARGB 1, 1, 0, 0)