....            QFile file1(fileName);        if(!file1.open(QIODevice::ReadOnly))        {            qDebug() << "file read fail!";            return;        }       QString qs = file1.readAll();        QFile file(fileName);        if(!file.open(QIODevice::WriteOnly | QIODevice::Truncate))        {            qDebug() << "file write fail!";            return;        }        QTextStream out(&file);        out << qs.mid(nStartIndex); // 解決問題單號#0000023        file.close();...如果在第3行中加入 QIODevice::Text，則文件中的0D（也就是/r）將會(huì)丟失。