Qt C++ 扫码枪使用数据处理

void keyPressEvent(QKeyEvent *keyValue)
{
  if (keyValue->key() == Qt::Key_Return) //扫码枪内字符串，以回车结尾
  {
    m_scanData = ui->lineEdit->text();
    qDebug() << "from scan Key_Return data:" << m_scanData;
    
    ui->lineEdit->setText("");
  }
  else {                
    m_scanData = ui->lineEdit->text();
    qDebug() << "from scan data:" << m_scanData;
    m_scanData += keyValue->text();
  }
}