我想将串行端口插入单独的QThread中,但是应用程序崩溃。我写了以下C ++类
Worker.h
class Worker : public QObject
{
Q_OBJECT
public:
explicit Worker(QObject *parent = 0);
signals:
void finished();
void error(QString err);
public slots:
void process();
};
class WorkerInterface : public QObject
{
Q_OBJECT
public:
explicit WorkerInterface(QObject *parent = nullptr);
~WorkerInterface();
serialport *readSerialPort();
signals:
void threadStoppedChanged();
public slots:
void errorString(QString errorMsg);
void stopThread();
private:
QThread m_thread;
serialPort *m_serial;
};
Worker::Worker(QObject *parent)
: QObject(parent)
{
}
void Worker::process()
{
emit finished();
}
Worker.cpp
WorkerInterface::WorkerInterface(QObject *parent)
: QObject(parent)
, m_thread(this)
{
serialPort::serialPortMaster = new serialPort(nullptr);
m_serial = serialPort::serialPortMaster;
serialPort::serialPortMaster->moveToThread(&m_thread);
connect(&m_thread, SIGNAL(started()),serialPort::serialPortMaster, SLOT(Init()));
m_thread.start();
}
WorkerInterface::~WorkerInterface()
{
m_thread.quit();
m_thread.wait(1000);
if (!m_thread.isFinished())
m_thread.terminate();
}
void WorkerInterface::errorString(QString errorMsg)
{
qDebug() << "error" << errorMsg;
}
void WorkerInterface::stopThread()
{
m_thread.quit();
m_thread.wait(1000);
if (!m_thread.isFinished())
m_thread.terminate();
emit threadStoppedChanged();
}
serialPort* WorkerInterface::readSerialPort()
{
return(m_serialPort);
}
在main.cpp中,我编写了以下代码:
WorkerInterface workerInterface;
engine.rootContext()->setContextProperty("newserial", workerInterface.readSerialPort());
QQmlComponent component(&engine,QUrl(QStringLiteral("qrc:/Pages/Content/Qml/main.qml")));
QObject *qmlObject = component.create();
当代码到达main.cpp中的最后一条指令时,应用程序崩溃,并且在QT创建者控制台中显示以下消息:
QObject: Cannot create children for a parent that is in a different thread.
(Parent is QSerialPort(0xee18c0), parent's thread is QThread(0xc8d8b0), current thread is QThread(0x7fffffffdc60)
QObject: Cannot create children for a parent that is in a different thread.
(Parent is QSerialPort(0xee18c0), parent's thread is QThread(0xc8d8b0), current thread is QThread(0x7fffffffdc60)
QQmlEngine: Illegal attempt to connect to serialPort(0xee1710) that is in a different thread than the QML engine QQmlApplicationEngine(0x7fffffffdc30.
有人可以帮助我解决崩溃吗?
非常感谢。
答案 0 :(得分:0)
假设您拥有可以响应文本的设备,那么做到这一点的最佳和最简单的方法就是这样:
class IODevLineReader
{
Q_OBJECT
public:
explicit IODevLineReader(QObject *parent);
public signals:
void lineWasReceived(const QString &line);
public slots:
void onReadyRead() {
QIODevice *dev = qobject_cast<QIODevice *>(sender());
while (dev && dev->canReadLine()) {
auto lineBytes = dev->readLine();
emit lineWasReceived(lineBytes);
}
}
};
只需将QSerialPort::readyRead()
连接到IODevLineReader::onReadyRead()
并将某个插槽连接到IODevLineReader::lineWasReceived()
信号,就可以完成不使用线程的操作。
如果您仍然坚持使用线程,只需使用同一对象树并将其移至指定线程即可。