Question

我正在从串口读取信息。我如何等待新行进入，然后处理数据？也就是说，我如何确保我一次整理一行。

此代码不起作用：

void MainWindow::readData()
{
    QByteArray data = serial->readAll(); //reads in one character at a time (or maybe more)
    console->putData(data); 
    charBuffer.append(data); 
    if (data.contains("\n")) //read into a structure until newline received.
    {
        //call parsedata
        sensorValues->parseData(charBuffer); //send the data to be parsed.
        //empty out the structure
        charBuffer = "";
    }
}

假设串口发送“Sensor1 200 \ n” 数据可能包含以下内容：“Se”，然后是“n”，“sor 2”“00 \ n”，依此类推。

如果我有一行文字，如何阻止调用parseData？

其他信息：
readData设置为一个插槽：

    connect(serial, SIGNAL(readyRead()), this, SLOT(readData()));

Answer 1

您是否尝试过使用SerialPort readLine（）函数？在每个readline（）之后，您可以将该行发送到一些新的ByteArray或QString进行解析。我还在末尾使用.trimmed（）来删除＆＃39; \ r＆＃39;和＆＃39; \ n＆＃39;字符，所以我可以这样做：

void MainWindow::readData()
{
    while (serial->canReadLine()){
       QByteArray data = serial->readLine();   //reads in data line by line, separated by \n or \r characters
       parseBytes(data.trimmed()) ;
     }
}

 void MainWindow::parseBytes(const QByteArray &data) <--which needs to be moved to       separate class, but here it's in the MainWindow, obviously improper
 {
       if (data.contains("1b0:"))
       {
            channel1Data.b0_code = data.mid(5);   // which equals "1", 
            //do stuff or feed channel1Data.b0_code to a control 
       }
 }

Answer 2

创建一个静态变量，然后存储数据，直到获得 \ n

void readData()
{
    // Read data
    static QByteArray byteArray;
    byteArray += pSerialPort->readAll();

    //we want to read all message not only chunks
    if(!QString(byteArray).contains("\n"))
        return;

    //sanitize data
    QString data = QString( byteArray ).remove("\r").remove("\n");
    byteArray.clear();

    // Print data
    qDebug() << "RECV: " << data;

    //Now send data to be parsed
}

Qt QSerialPort缓冲

2 个答案: