求各位大神帮助

[weixin_38114194]

QString msg = "1234";   unsigned int fd;   QFile *myFile = new QFile();   myFile->setFileName("D:\test\QT-jiemian\123.txt");    if (myFile->open(fd, QIODevice::ReadOnly | QIODevice::Text))    {             myFile->reset();       myFile->atEnd();         msg = myFile->readAll();         ui->lineEdit->setText(msg);         qDebug() << msg;    }编译后提示  QFile::at: Cannot set file position 0  输出“”