qt之读写二进制文件（序列化方式）

除文本文件外，其他文件都可以看做是二进制文件，可以单独使用QFile读写二进制文件，但一般结合使用QFile和QDataStream读写二进制文件。

头文件部分主要代码

private:
    QString m_filename;
    template<class T> void writeByStream(T value);
    template<class T> void readByStream(T &value);

cpp中主要实现代码

template <class T>
void MainWindow::writeByStream(T value)
{
    QFile fileDevice(m_filename);
    if(!fileDevice.open(QIODevice::WriteOnly))
        return ;
    QDataStream fileStream(&fileDevice);
    fileStream.setVersion(QDataStream::Qt_6_8);
    if(ui->radioBigEndian->isChecked())
    {
        fileStream.setByteOrder(QDataStream::BigEndian);
    }
    else {
        fileStream.setByteOrder(QDataStream::LittleEndian);
    }
    if(ui->radiosinglePrecision->isChecked())
    {
        fileStream.setFloatingPointPrecision(QDataStream::SinglePrecision);
    }
    else
        fileStream.setFloatingPointPrecision(QDataStream::DoublePrecision);
    fileStream<<value;
    fileDevice.close();
}
template <class T>
void MainWindow::readByStream(T &value)
{
    if(!QFile::exists(m_filename))
        return ;

    QFile fileDevice(m_filename);
    if(!fileDevice.open(QIODevice::ReadOnly))
        return ;
    QDataStream fileStream(&fileDevice);
    fileStream.setVersion(QDataStream::Qt_6_8);
    if(ui->radioBigEndian->isChecked())
    {
        fileStream.setByteOrder(QDataStream::BigEndian);
    }
    else {
        fileStream.setByteOrder(QDataStream::LittleEndian);
    }
    if(ui->radiosinglePrecision->isChecked())
    {
        fileStream.setFloatingPointPrecision(QDataStream::SinglePrecision);
    }
    else
        fileStream.setFloatingPointPrecision(QDataStream::DoublePrecision);
    fileStream>>value;
    fileDevice.close();
}