QT输出打印信息至txt文件中

QFile log("d:\\testlog.txt");
if(!log.open(QIODevice::ReadWrite))
{
	return false;
}
log.write("start-");
log.flush();

log.write(QString("Num:%1-").arg(num).toUtf8());
log.flush();

log.write(QString("size:%1-").arg(QString::number(tempFile.size())).toUtf8());
log.flush();

---

连续追加

QFile log("d:\\testlog.txt");
log.open(QIODevice::Append);
log.write("start-\n");
log.flush();
log.write(QString("size:%1-").arg(QString::number(tempFile.size())).toUtf8());
log.flush();