thread Synchronous problem

[wearilybird]

i start a thread to handle somethings ,gui wait for the things process .when end , notify the gui thread go run .here is my code :

class Worker : public QObject
{
    Q_OBJECT
public:
       Worker (){m_hEvent = NULL ;};
public slots:
    void doWork(const QString &parameter) {
        // ...
 
 
       setEvent(m_hEvent);
    }
 
public :
   void SetSyncEvent(Handle hEvent){m_hEvent = hEvent};
signals:
    void resultReady(const QString &result);
private:
   Handle m_hEvent ;
};
 
class Controller : public QObject
{
    Q_OBJECT
    QThread workerThread;
public:
    Controller() {
 
        m_hEvent = ::CreateEvent(NULL,FALSE,FALSE,NULL);
 
        Worker *worker = new Worker;
 
        worker->SetEvent(m_hEvent);
        worker->moveToThread(&workerThread);
        connect(workerThread, &QThread::finished, worker, &QObject::deleteLater);
        connect(this, &Controller::operate, worker, &Worker::doWork);
       // connect(worker, &Worker::resultReady, this, &Controller::handleResults);
         workerThread.start();
    }
    ~Controller() {
        workerThread.quit();
        workerThread.wait();
    }
void Oper()
{
     emit operate(QString("fsfs"));
     WaitForSingleObject(m_hEvent,INFINITE);
     .......
}
public slots:
   // void handleResults(const QString &);
signals:
    void operate(const QString &);
private:
   Handle m_hEvent ;
};
 
void main()
{ Controller controle ; controle.oper();
}

class Worker : public QObject
{
    Q_OBJECT
public:
       Worker (){m_hEvent = NULL ;};
public slots:
    void doWork(const QString &parameter) {
        // ...
 
       
       setEvent(m_hEvent);
    }
 
public :
   void SetSyncEvent(Handle hEvent){m_hEvent = hEvent};
signals:
    void resultReady(const QString &result);
private:
   Handle m_hEvent ;
};
 
class Controller : public QObject
{
    Q_OBJECT
    QThread workerThread;
public:
    Controller() {
 
        m_hEvent = ::CreateEvent(NULL,FALSE,FALSE,NULL);
 
        Worker *worker = new Worker;
 
        worker->SetEvent(m_hEvent);
        worker->moveToThread(&workerThread);
        connect(workerThread, &QThread::finished, worker, &QObject::deleteLater);
        connect(this, &Controller::operate, worker, &Worker::doWork);
       // connect(worker, &Worker::resultReady, this, &Controller::handleResults);
         workerThread.start();
    }
    ~Controller() {
        workerThread.quit();
        workerThread.wait();
    }
void Oper()
{
     emit operate(QString("fsfs"));
     WaitForSingleObject(m_hEvent,INFINITE);
     .......
}
public slots:
   // void handleResults(const QString &);
signals:
    void operate(const QString &);
private:
   Handle m_hEvent ;
};

void main()
{ Controller controle ; controle.oper();
}

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but sometimes i found after worker class’s function doWork run the last code setevent(m_hevent), the app can not get the event and the WaitForSingleObject(m_hEvent,INFINITE) always in wait state . i use vs2008 qt 5.2.1 ,i found the workerThread can not exit the thread ,can anyone tell me why and how can i solved this problem .

[anda_skoa]

First question is why you even want to use a thread if you block the main thread anyway?

Usually a worker thread is used to do something long going and potentially block while keeping the UI responsive.

Cheers,
_