QT moveToThread

最新推荐文章于 2025-12-01 17:11:37 发布

原创最新推荐文章于 2025-12-01 17:11:37 发布 · 393 阅读

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#qt #多线程

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本文展示了如何在QT环境中创建一个主窗口，并添加两个按钮，实现信号和槽的连接。同时，创建了一个继承自QObject的MyThread类，通过线程进行通信。在点击按钮时，主线程发送消息到子线程，子线程接收到消息后，再回传消息到主线程。整个过程演示了QT中的多线程通信机制。

创建界面工程后，在界面上拖两个按钮并添加对应的click槽，再添加一个MyThread类继承自QObject。

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}
class QThread;
class MyThread;
class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
signals:
    void sig_recvMsg(QString msg);

public slots:
    void slot_sendMsg(QString msg);

private slots:
    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

private:
    Ui::MainWindow *ui;
    QThread *thread;
    MyThread *myThread;
};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QThread>
#include "mythread.h"
#include <QDebug>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    thread = new QThread();
    myThread = new MyThread();
    myThread->moveToThread(thread);
    connect(this, &MainWindow::sig_recvMsg, myThread, &MyThread::slot_recvMsg);
    connect(myThread, &MyThread::sig_sendMsg, this, &MainWindow::slot_sendMsg);
}

MainWindow::~MainWindow()
{
    delete ui;
    if(thread) {
        delete thread;
        thread = nullptr;
    }
    if(myThread) {
        delete myThread;
        myThread = nullptr;
    }
}

void MainWindow::slot_sendMsg(QString msg)
{
    qDebug()<<__FUNCTION__<<" "<<msg<<" "<<QThread::currentThreadId();
    thread->quit();
    thread->wait();
}

void MainWindow::on_pushButton_clicked()
{
    emit sig_recvMsg("222222222");
    thread->start();
}

void MainWindow::on_pushButton_2_clicked()
{
    myThread->slot_recvMsg("333333333");
}

mythread.h

#ifndef MYTHREAD_H
#define MYTHREAD_H

#include <QObject>

class MyThread : public QObject
{
    Q_OBJECT
public:
    explicit MyThread(QObject *parent = 0);
    ~MyThread();

signals:
    void sig_sendMsg(QString msg);

public slots:
    void slot_recvMsg(QString msg);
};

#endif // MYTHREAD_H

mythread.cpp

#include "mythread.h"
#include <QThread>
#include <QDebug>

MyThread::MyThread(QObject *parent) : QObject(parent)
{
    qDebug()<<__FUNCTION__<<" "<<QThread::currentThreadId();
}

MyThread::~MyThread()
{
    qDebug()<<__FUNCTION__<<" "<<QThread::currentThreadId();
}

void MyThread::slot_recvMsg(QString msg)
{
    qDebug()<<__FUNCTION__<<" "<<msg<<" "<<QThread::currentThreadId();
    emit sig_sendMsg("1111111111");
}

先后点击两个按钮，得到如下输出，threadId每此都会不同，不必参照下面的输出结果

MyThread::MyThread   0x21d0
MyThread::slot_recvMsg   "222222222"   0x3238
MainWindow::slot_sendMsg   "1111111111"   0x21d0
MyThread::slot_recvMsg   "333333333"   0x21d0
MainWindow::slot_sendMsg   "1111111111"   0x21d0
MyThread::~MyThread   0x21d0