How to read n bytes of a file?(QT C++)

amin_nekounaam

Hi im new to Qt and im trying to read for example the first 4 bytes of my .txt file and show it. I've been searching and figure that QbyteArray may help me best in this situation. so I really like to know how can i read the first 4 bytes of my file with QbyteArray? (appreciate if u write any example code)

Christian Ehrlicher

Open the file and then call QFile::read() with the number of bytes you want to read.

amin_nekounaam

actually im try and i think i did it wrong. could you edit the correct code?
my code:

QString File_Name = QFileDialog::getOpenFileName(this, "open the file name", QDir::homePath());
QByteArray data;
QFile File2(File_Name);
File2.open(QIODevice::ReadOnly | QFile::Text);

I want to read 4 bytes of File2.

Christian Ehrlicher

@amin_nekounaam said in How to read n bytes of a file?(QT C++):

I want to read 4 bytes of File2.

And what's the problem - as I said above use QFile::read() for this task.
And you should check the return value of QFile::open()

amin_nekounaam

@Christian-Ehrlicher said in How to read n bytes of a file?(QT C++):

Thanks got it. Solved.

Christian Ehrlicher

@amin_nekounaam Then also mark this topic as solved, thx.