How to get file size?

Question

Qt

Hello, I'm trying to get the file size in this way:

qint64 labor::fileSizer(QString nameRar)
{
    qint64 fileSize=0;
    QFile fileRar("C:\\QtProject\\modulINFO\\temp\\lab\\lab2\\"+nameRar+".rar");
    fileRar.open(QIODevice::ReadOnly);
    fileSize = fileRar.size();
    fileRar.close();
    return  fileSize;
}

ui->label_2->setText(QString::number(fileSizer("test1")));

Returns always zero, regardless of the weight of the source file. what could be the problem?

Answer 1

1) make sure the file really exists. To do this, open returns a bool.
2) better use QFileInfo.