Qt线程(1) moveToThread

• 若在Qt准备使用线程类一般有两种方式(1) 采用WorkObject配合QThread进行使用 (2)继承QThread, 重载run()函数即可。
• 注:采用Qt::Concurrent之类的不在本文讨论范围内.

　　方式一、采用WorkObject配合QThread进行使用

1. 创建一个用于计算的对象，该对象的运算相关函数防止在public slots 下：

    //..Object.h
    class CObject : public QObject
    {
        Q_OBJECT
    public:
        explicit CObject(QObject *parent = 0);
        ~CObject();
   
    signals:
        void sigFinish(const QString &s); //跨线程请注意使用const
   
    public slots:
        void Run();
        void Stop();
   
    private:
        bool m_bStop;
    };
   
    //..Object.cpp
    CObject::CObject(QObject *parent)
        : QObject(parent),m_bStop(false)
    {
   
    }
   
    void CObject::Run()
    {
        int i = 0;
        while(1)
        {
            if(m_bStop)
            {
                return;
            }
            qDebug()<<"Object TheradID = "<<QThread::currentThreadId();
            qDebug()<<"Run i = "<<i;
            sleep(1);
            if(++i == 10)
            {
                emit sigFinish("Finish");//信号是线程安全的,当然这得扯到后面的连接方式
            }
        }
    }
   
    void CObject::Stop()
    {
        m_bStop = true;
        emit sigFinish("Stop");//!!按照需求添加
    }

2. 创建一个测试对象CTest

    //..test.h
    class CTest : public QObject
    {
        Q_OBJECT
    public:
        explicit CTest(QObject *parent = 0);
        void Run();
        void Stop();
   
    signals:
   
    private slots:
        void slotFinish(const QString &);
   
    private:
        QList<CObject *> m_ListObj;
    };
   
    //..test.cpp
    CTest::CTest(QObject *parent) : QObject(parent)
    {
   
    }
   
    void CTest::Run()
    {
        QThread *pThread = new QThread(this); // 只充当一个作为另个线程的入口
        CObject *pObj = new CObject; //注意:moveToThread不能使用在双亲对象上
        m_ListObj.append(pObj);
   
        qDebug()<<"Current Main Run Thread = "<<QThread::currentThreadId();
   
        connect(pObj,SIGNAL(sigFinish(QString)),pObj,SLOT(deleteLater()));
        connect(pObj,SIGNAL(sigFinish(QString)),pThread,SLOT(quit()));
        connect(pObj,SIGNAL(sigFinish(QString)),this,SLOT(slotFinish(QString)));
   
        connect(pThread,SIGNAL(started()),pObj,SLOT(Run()));
        connect(pThread,SIGNAL(finished()),pObj,SLOT(deleteLater()));
   
         pObj->moveToThread(pThread);
   
        pThread->start();
    }
    void CTest::Stop()
    {
        foreach (CObject *pObj, m_ListObj)
        {
            if(!QMetaObject::invokeMethod(pObj,"Stop",Qt::DirectConnection))//!!留个坑,为什么autoConnection会没反应
            {
                qDebug()<<"error";
            }
        }
        m_ListObj.clear();
    }
   
    void CTest::slotFinish(const QString &s)
    {
        qDebug()<<"Main Thread Receive:"<<s;
    }

3. main.cpp

    //..main.cpp
    int main(int argc, char *argv[])
    {
        QCoreApplication a(argc, argv);
        CTest test;
        test.Run();
        sleep(5);
        test.Stop();
        return a.exec();
    }

4. 执行结果
   

　　

　　Well Done,方式2见Qt线程(2) QThread中使用WorkObject?