QT 多线程信号与槽（三）

最新推荐文章于 2024-09-10 16:27:06 发布

嵌入式乌托邦

最新推荐文章于 2024-09-10 16:27:06 发布

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分类专栏： QT 文章标签： QT多线程

本文链接：https://blog.youkuaiyun.com/lutao614/article/details/8965218

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本文详细介绍了如何通过继承QObject类，利用主线程向子线程发送信号并由子线程接收信号，进而执行槽函数操作。通过具体的代码示例展示了在新线程中运行槽函数的过程，确保了线程间的高效通信。

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这回写被大家认可的方法，继承QObject。还是主线程向子线程发信号，子线程接收信号，槽函数在新线程中运行。

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);//主线程给子线程发信号
    connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(MainWindowSlot()));
    q_myObj.moveToThread(&thread);
}
MainWindow::~MainWindow()
{
    delete ui;
}
void MainWindow::MainWindowSlot()
{
    thread.start();
    emit MainWindowSignal();
}
最后打印：
[root@localhost thread_test2]# ./thread_test2
Mythread: 3064583888 
run: 3040099216 
MyObjectSlot: 3040099216 
看见没？MyObjectSlot和run的线程ID是一样的，说明在子线程中运行了。