错误：“ QObject”是“ SerialPort”的模糊基数QObject :: connect（＆uartObj，SIGNAL（readDone（QByteArray）），this，SLOT（hdlRxDone（QByteArray））））;

Question

I want to create SerialPort class, and it can receive msg automatic and then emit a signal.

but when I compile it show the error message:

error: 'QObject' is an ambiguous base of 'SerialPort' QObject::connect(&uartObj, SIGNAL(readDone(QByteArray)), this, SLOT(hdlRxDone(QByteArray)));

have someone can help me to solve it ? thanks.

#ifndef SERIALPORT_H
#define SERIALPORT_H

#include <QObject>
#include <QSerialPort>
#include <QThread>

class SerialPort : public QSerialPort, public QThread
{
    Q_OBJECT
public:
    explicit SerialPort(QObject *parent = 0);
    ~SerialPort();
    void stop();

signals:
    void readDone(QByteArray data);

public slots:

private:
    void run();
};

#endif // SERIALPORT_H

Answer 1

Both QSerialPort and QThread derived from QObject , so in your code you have multiple inheritance from QObject , which is forbidden in Qt . You should derive only from QThread , but it is not very good way. The best way is to create simple Worker class derived from QObject , which HAS QSerialPort , and move this class to some thread with moveToThread() .

You can find more information about correct usage here or in the documentation .

Full example about serial port in separate thread you can find here , it is in russian language, but you need only code which is not very complex.