How to save hex format to file?

[tanthinh1510]

Hi!
I need save hex format, but I don't know how to do it
I have try code but it does not correct

QString filename;
    filename ="./data.hex";
    QFile file(filename);
    QByteArray frame_data;
    frame_data.append("D1A0A0FF");
    QByteArray frame_convert;
    frame_convert = QByteArray::fromHex(frame_data);
 
    if(file.open(QFile::WriteOnly)){
        QDataStream out(&file);
        out<< frame_convert;
    }

QString filename;
    filename ="./data.hex";
    QFile file(filename);
    QByteArray frame_data;
    frame_data.append("D1A0A0FF");
    QByteArray frame_convert;
    frame_convert = QByteArray::fromHex(frame_data);

    if(file.open(QFile::WriteOnly)){
        QDataStream out(&file);
        out<< frame_convert;
    }

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have solution for this?
thanks!