QT:QThread:重写run函数

 

问题描述：QThread的使用方法2重写run函数

解决：

创建一个集成QThread的类thread

thread.h:

run()函数则是新线程的入口，run()函数退出意味着线程的退出。

stop()函数：线程停止

#ifndef THREAD_H
#define THREAD_H
#include <QThread>
#include <iostream>
#include <QDebug>class thread: public QThread
{Q_OBJECT
public:thread();void stop();protected:void run();void printMessage();private:volatile bool stopped;};#endif // THREAD_H

thread.cpp

#include "thread.h"
#include <QDebug>
thread::thread()
{stopped =false;}
void thread::run()
{qDebug() << "子线程id：" << QThread::currentThreadId();while(!stopped){printMessage();}stopped = false;
}void thread::stop()
{qDebug()<<"进程已经停止";stopped = true;
}void thread::printMessage()
{qDebug()<< "hello";usleep(5);
}

mainwindow.h:两个按钮的槽函数一个是开启线程一个是关闭线程

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QThread>
#include <iostream>
#include <QDebug>
#include <QMainWindow>
#include <QCloseEvent>
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();private slots:void on_pushButton_clicked();void on_pushButton_2_clicked();private:Ui::MainWindow *ui;
protected:void closeEvent(QCloseEvent *event);
};
#endif // MAINWINDOW_H

mainwindow.cpp:

closeEvent:QThread的安全销毁

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "thread.h"
thread  myThread;
//thread  myThread1;
MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);qDebug() << "主线程id：" << QThread::currentThreadId();}
//关闭线程
void MainWindow::on_pushButton_clicked()
{myThread.stop();}
//开启线程void MainWindow::on_pushButton_2_clicked()
{myThread.start();
}
void MainWindow::closeEvent(QCloseEvent *event)
{myThread.stop();myThread.wait();event->accept();
}MainWindow::~MainWindow()
{delete ui;}