Write each receiving QByteArray to end of a file

[Alex22]

Hi, I have a serial connection that I put each coming data into a QByteArray:

connect(&SerialPort, SIGNAL(readyRead()), this, SLOT(slot_reading()));

connect(&SerialPort, SIGNAL(readyRead()), this, SLOT(slot_reading()));

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//the slot:
void Cserial::slot_reading()
{
    QByteArray DataReading = SerialPort.readAll();
}

//the slot:
void Cserial::slot_reading()
{
    QByteArray DataReading = SerialPort.readAll();
}

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I need to save all coming data into a file. So i must gather each QByteArray::DataReading and at the end, saving all of them into a file (by pushing a QPushButtom in name of "save").
1-How could I gather all data?
and then
2-how can I save into a file?

Thanks a lot for any help