Reading value from hex address in QT

[JohnnyUSA]

Hello guys, newbie QT programmer here stuck and in need of help

Case scenario is as follows: I have a binary file that i've managed to write data at specific address using the following piece of code:

QFile file ("example.dat";
QString data = "30";
 
file.open(QIODevice::ReadWrite);
QByteArray fileData(settings.readAll());
 
QByteArray data_write = QByteArray::fromHex(data.toLatin1());
fileData.replace(0x00000008,1,data_write);
 
file.seek(0);
file.write(fileData);
file.flush();
file.close();

QFile file ("example.dat";
QString data = "30";

file.open(QIODevice::ReadWrite);
QByteArray fileData(settings.readAll());

QByteArray data_write = QByteArray::fromHex(data.toLatin1());
fileData.replace(0x00000008,1,data_write);

file.seek(0);
file.write(fileData);
file.flush();
file.close();

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This piece of code works perfectly by writing 30 to 0x00000008 address.

Now, what i fail to do, is reading the data back from 0x00000008 address for further manipulation. So, how can i manage to read the data from that specific binary file address? I'm searching on the web for 4 days already and still no solution. Hope you guys can help me out.

Thanks in advance!