qt有两个子线程,一个在使用串口进行数据收发,怎另一个也需要使用串口发数据怎么设计
时间: 2024-02-28 12:52:52 浏览: 30
如果有两个子线程都需要使用串口进行数据收发,那么可以考虑将串口通信放在一个单独的线程中进行,并使用信号与槽机制来与两个子线程进行通信。
具体来说,可以在主线程中创建一个串口通信线程,并在该线程中创建一个QSerialPort对象来进行串口通信。然后,在两个子线程中,通过信号与槽机制向串口通信线程发送请求,并通过信号来接收串口通信线程返回的数据。
为了保证线程安全,需要在串口通信线程中使用互斥锁来保护QSerialPort对象,以避免多个线程同时对串口进行读写操作。
下面是一个可能的实现示例:
```cpp
// 串口通信线程类
class SerialThread : public QThread
{
Q_OBJECT
public:
SerialThread(QObject *parent = nullptr) : QThread(parent)
{
m_serialPort = new QSerialPort(this);
// 设置串口参数...
}
void sendRequest(const QString &request)
{
QMutexLocker locker(&m_mutex);
m_request = request;
m_requestAvailable.wakeAll();
}
QString receiveResponse()
{
QMutexLocker locker(&m_mutex);
while (m_response.isEmpty())
m_responseAvailable.wait(&m_mutex);
QString response = m_response;
m_response.clear();
return response;
}
protected:
void run() override
{
m_serialPort->open(QIODevice::ReadWrite);
while (!isInterruptionRequested()) {
QMutexLocker locker(&m_mutex);
while (m_request.isEmpty())
m_requestAvailable.wait(&m_mutex);
m_serialPort->write(m_request.toUtf8());
m_serialPort->waitForBytesWritten(1000);
m_request.clear();
QByteArray data = m_serialPort->readAll();
if (!data.isEmpty()) {
QString response = QString::fromUtf8(data);
m_response = response;
m_responseAvailable.wakeAll();
}
}
m_serialPort->close();
}
private:
QSerialPort *m_serialPort;
QString m_request;
QString m_response;
QMutex m_mutex;
QWaitCondition m_requestAvailable;
QWaitCondition m_responseAvailable;
};
// 子线程1类
class Thread1 : public QThread
{
Q_OBJECT
public:
Thread1(QObject *parent = nullptr) : QThread(parent)
{
m_serialThread = new SerialThread(this);
m_serialThread->start();
}
void sendRequest(const QString &request)
{
m_serialThread->sendRequest(request);
}
signals:
void responseReceived(const QString &response);
protected:
void run() override
{
while (!isInterruptionRequested()) {
QString request = generateRequest(); // 生成请求
sendRequest(request);
QString response = m_serialThread->receiveResponse();
emit responseReceived(response);
}
}
private:
SerialThread *m_serialThread;
};
// 子线程2类
class Thread2 : public QThread
{
Q_OBJECT
public:
Thread2(QObject *parent = nullptr) : QThread(parent)
{
m_serialThread = new SerialThread(this);
m_serialThread->start();
}
void sendRequest(const QString &request)
{
m_serialThread->sendRequest(request);
}
signals:
void responseReceived(const QString &response);
protected:
void run() override
{
while (!isInterruptionRequested()) {
QString request = generateRequest(); // 生成请求
sendRequest(request);
QString response = m_serialThread->receiveResponse();
emit responseReceived(response);
}
}
private:
SerialThread *m_serialThread;
};
```
在上述代码中,SerialThread类表示串口通信线程,Thread1和Thread2类分别表示两个子线程。在主线程中创建Thread1和Thread2对象,然后启动它们即可。
在Thread1和Thread2中,通过调用SerialThread的sendRequest()函数来发送请求,然后通过调用SerialThread的receiveResponse()函数来接收响应。在SerialThread中,使用互斥锁和条件变量来保护请求和响应的读写操作。
需要注意的是,由于串口通信线程会一直运行,因此在退出程序时需要显式地停止该线程。可以在主线程中的析构函数中调用SerialThread的requestInterruption()函数来请求停止该线程,并通过调用SerialThread的wait()函数来等待该线程退出。