Qt的moveToThread式多线程实例完整代码

最新推荐文章于 2025-07-23 20:35:59 发布

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本文介绍了一个使用Qt框架实现多线程操作的示例。通过将自定义对象MyObject放置在独立的线程中，并从主线程的按钮触发信号到该对象的槽，演示了如何正确地在不同线程间通信。此外，还展示了如何在主线程中创建按钮，并将这些按钮的点击事件连接到MyObject的不同槽函数，以及如何在主线程中显示当前线程的ID。

//mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include "myobject.h"
#include <QPushButton>
#include <QMainWindow>

namespace Ui{
class MainWindow;
}

class MainWindow:public QMainWindow
{
    Q_OBJECT
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

public slots:
    void onFirstPushed();
    void onSecondPushed();
    void onSelfPushed();
    void onExitPushed();

private:
    Ui::MainWindow *ui;
    
    MyObject *my;
    QPushButton *firstButton;
    QPushButton *secondButton;
    QPushButton *threeButton;
    QPushButton *selfButton;
    QPushButton *exitButton;   
};
#endif
//mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QVBoxLayout>

MainWindow::MainWindow(QWidget *parent):QMainWindow(parent),ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    my = new MyObject;
    firstButton = new QPushButton(tr("first"), 0);
    connect(firstButton, SIGNAL(clicked()), my, SLOT(first()), Qt::QueuedConnection);
    secondButton = new QPushButton(tr("second"), 0);
    connect(secondButton, SIGNAL(clicked()), my, SLOT(second()), Qt::QueuedConnection);
    threeButton = new QPushButton(tr("three"), 0);
    connect(threeButton, SIGNAL(clicked()), my, SLOT(three()), Qt::QueuedConnection);
    selfButton = new QPushButton(tr("self"), 0);
    connect(selfButton, SIGNAL(clicked()), this, SLOT(onSelfPushed()));
    exitButton = new QPushButton(tr("exit"), 0);
    connect(exitButton, SIGNAL(clicked()), this, SLOT(onExitPushed()));

    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(firstButton);
    layout->addWidget(secondButton);
    layout->addWidget(threeButton);
    layout->addWidget(selfButton);
    layout->addWidget(exitButton);

    QWidget *p = new QWidget;
    p->setLayout(layout);

    QThread *thread = new QThread;
    my->moveToThread(thread);
    thread->start();
    connect(thread, SIGNAL(started()), my, SLOT(first()));
    setCentralWidget(p);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::onFirstPushed()
{
    my->first();
}
void MainWindow::onSecondPushed()
{
    my->second();
}
void MainWindow::onThreePushed()
{
    my->three();
}
void MainWindow::onSelfPushed()
{
    qDebug() << QThread::currentThreadId();
}
void MainWindow::onExitPushed()
{
    close();
}
//myobject.h
#ifndef MYOBJECT_H
#define MYOBJECT_H
#include <QObject>
#include <QDebug>
#include <QThread>

class MyObject:public QObject{
    Q_OBJECT
public:
    MyObject(){}
    ~MyObject(){}
public slots:
    void first();
    void second();
    void three();
};
#endif
//myobject.cpp
#include "myobject.h"
void MyObject::first()
{
    qDebug() << QThread::currentThreadId();
}
void MyObject::second()
{
    qDebug() << QThread::currentThreadId();
}
void MyObject::three()
{
    qDebug() << QThread::currentThreadId();
}