Parallel thread to read coming data

[Andrew23]

I never managed concurrent threads in Qt but now I need a function in my application to monitor the presence of available data coming from an FTDI device (I'm using the FDTI driver to read/write data). I need a for loop that run every few millisecond to check if there are bytes in the receive queue and thet run concurrently with the application. If there are bytes in the receive queue then emits a signal for the main thread.

I read some example about the Concurrent library but I can't achieve my purpose cause I am not familiar with this stuff. Can someone help me or get me some suggestion?

[mayer22]

If you prefer not to manage threads directly, you can use a QTimer to check for data at regular intervals. This approach runs in the event loop and is simpler to implement.

#include <QTimer>
#include <QSerialPort>
 
class YourMainClass : public QObject {
    Q_OBJECT
 
public:
    YourMainClass(QSerialPort* serialPort) : m_serialPort(serialPort) {
        QTimer* timer = new QTimer(this);
        connect(timer, &QTimer::timeout, this, &YourMainClass::checkForData);
        timer->start(100); // Check every 100 milliseconds
    }
 
private slots:
    void checkForData() {
        if (m_serialPort->bytesAvailable() > 0) {
            emit dataAvailable();
        }
    }
 
signals:
    void dataAvailable();
 
private:
    QSerialPort* m_serialPort;
};

#include <QTimer>
#include <QSerialPort>

class YourMainClass : public QObject {
    Q_OBJECT

public:
    YourMainClass(QSerialPort* serialPort) : m_serialPort(serialPort) {
        QTimer* timer = new QTimer(this);
        connect(timer, &QTimer::timeout, this, &YourMainClass::checkForData);
        timer->start(100); // Check every 100 milliseconds
    }

private slots:
    void checkForData() {
        if (m_serialPort->bytesAvailable() > 0) {
            emit dataAvailable();
        }
    }

signals:
    void dataAvailable();

private:
    QSerialPort* m_serialPort;
};

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In this case, you can connect the dataAvailable signal to any slot in your main application where you handle the incoming data.

block blast