QT 多線程信號與槽（三）

這回寫被大家認可的方法，繼承QObject。還是主線程向子線程發信號，子線程接收信號，槽函數在新線程中運行。

mythread.h

#include <QThread>

#include <QDebug>

class Mythread : public QThread

{

    Q_OBJECT

public:

    Mythread();

protected:

    void run();

private:

signals:

    void MyThreadSignal();

public slots:

    void MyThreadSlot();

};

mythread.cpp

#include "mythread.h"

#include <QDebug>

Mythread::Mythread()

{

    qDebug()<<"Mythread:" <<QThread::currentThreadId();

}

void Mythread::run()

{

    qDebug()<<"run:" <<QThread::currentThreadId();

    exec();

}

void Mythread::MyThreadSlot()

{

    qDebug()<<"from MainWindow:" <<QThread::currentThreadId();

}

myobject.h

#include <QObject>

class Myobject : public QObject

{

    Q_OBJECT

public:

    explicit Myobject(QObject *parent = 0);

signals:

    void MyObjectSignal();

public slots:

    void MyObjectSlot();

};

myobject.cpp

#include "myobject.h"

#include<QDebug>

#include<QThread>

Myobject::Myobject(QObject *parent) :

    QObject(parent)

{

    emit MyObjectSignal();

}

void Myobject::MyObjectSlot()

{

    qDebug()<<"MyObjectSlot:" <<QThread::currentThreadId();

}

mainwindow.h

#include <QMainWindow>

#include "myobject.h"

#include "mythread.h"

namespace Ui {

    class MainWindow;

}

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

public slots:

    void MainWindowSlot();

signals:

    void MainWindowSignal();

private:

    Ui::MainWindow *ui;

    Myobject q_myObj;

    Mythread thread;

};

mainwindow.cpp

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    connect(this,SIGNAL(MainWindowSignal()),&q_myObj,SLOT(MyObjectSlot()),Qt::QueuedConnection);//主線程給子線程發信號

    connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(MainWindowSlot()));

    q_myObj.moveToThread(&thread);

}

MainWindow::~MainWindow()

{

    delete ui;

}

void MainWindow::MainWindowSlot()

{

    thread.start();

    emit MainWindowSignal();

}

最後打印：

[root@localhost thread_test2]# ./thread_test2

Mythread: 3064583888 
run: 3040099216 
MyObjectSlot: 3040099216 

看見沒？

MyObjectSlot和run的線程ID是一樣的，說明在子線程中運行了。