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);}elsefileStream.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);}elsefileStream.setFloatingPointPrecision(QDataStream::DoublePrecision);fileStream>>value;fileDevice.close();
}