Qt在主线程打开串口,然后在子线程中调用串口的接收方法可以么?
时间: 2023-12-10 19:42:23 浏览: 260
QT实现十六机制接收串口程序,自己写的代码,打开编译就能用!!!
一般来说,Qt的串口通信是基于事件驱动的,也就是说,串口接收到数据时会自动触发QSerialPort对象的readyRead()信号。因此,你可以在主线程中打开串口,并在子线程中监听readyRead()信号并读取串口数据。具体实现方法可以参考以下步骤:
1. 在主线程中创建QSerialPort对象,并打开串口。例如:
```
QSerialPort serialPort;
serialPort.setPortName("COM1");
serialPort.setBaudRate(QSerialPort::Baud9600);
serialPort.setDataBits(QSerialPort::Data8);
serialPort.setParity(QSerialPort::NoParity);
serialPort.setStopBits(QSerialPort::OneStop);
serialPort.open(QIODevice::ReadWrite);
```
2. 在主线程中创建子线程,并将QSerialPort对象传递给子线程。例如:
```
QThread* thread = new QThread;
MySerialPortWorker* worker = new MySerialPortWorker(&serialPort);
worker->moveToThread(thread);
connect(thread, &QThread::started, worker, &MySerialPortWorker::startListening);
connect(worker, &MySerialPortWorker::finished, thread, &QThread::quit);
connect(worker, &MySerialPortWorker::finished, worker, &MySerialPortWorker::deleteLater);
connect(thread, &QThread::finished, thread, &QThread::deleteLater);
thread->start();
```
3. 在子线程中创建一个QObject子类,用于监听readyRead()信号并读取串口数据。例如:
```
class MySerialPortWorker : public QObject
{
Q_OBJECT
public:
MySerialPortWorker(QSerialPort* serialPort) : m_serialPort(serialPort) {}
public slots:
void startListening()
{
connect(m_serialPort, &QSerialPort::readyRead, this, &MySerialPortWorker::readData);
}
signals:
void finished();
private:
QSerialPort* m_serialPort;
void readData()
{
QByteArray data = m_serialPort->readAll();
// 处理接收到的数据
}
};
```
需要注意的是,Qt的串口通信是线程安全的,也就是说,你可以在任何线程中使用QSerialPort对象的方法。但是,为了避免竞争条件和死锁等问题,建议在主线程中打开和关闭串口,而在子线程中读取串口数据。
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