Qt有两种多线程的方法,其中一种是继承QThread的run函数,
另外一种是把一个继承于QObject的类用moveToThread函数转移到一个Thread里。
Qt4.8之前都是使用继承QThread的run这种方法,但是Qt4.8之后,Qt官方建议使用第二种方法。
具体的使用步骤如下:
1.从QObject派生一个类,将耗时的工作写在该类的槽函数中。
2.将派生类对象移动到一个QThread中,该线程需要start。(这一步使用moveToThread)
3.通过信号连接派生类的槽函数,并通过信号触发槽函数。(槽函数在子线程中执行)
//tes.h
#ifndef TES_H
#define TES_H
#include <QCoreApplication>
#include <QDebug>
#include <QThread>
#include <QString>
#include <QObject>
class Worker:public QObject
{
Q_OBJECT
public:
explicit Worker(QObject *parent=0);
~Worker();
signals:
void sig_finish();
public slots:
void slot_dowork();
};
#endif // TES_H
//tes.cpp
#include "tes.h"
Worker::Worker(QObject *parent):QObject(parent)
{
qDebug()<<"worker()";
}
Worker::~Worker()
{
qDebug()<<"~worker()";
}
void Worker::slot_dowork()
{
qDebug()<< "do work,thread id = " << QThread::currentThreadId();
emit sig_finish();
}
//mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "tes.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
void dowork();
private:
Ui::MainWindow *ui;
Worker *m_pworker;
QThread *m_pthread;
signals:
void sig_dowork();
public slots:
void slot_finish();
};
#endif // MAINWINDOW_H
//mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
qDebug()<<"mainwindow()";
ui->setupUi(this);
m_pworker = new Worker();
m_pthread = new QThread();
m_pworker->moveToThread(m_pthread);
qDebug()<< "start,thread id = " << QThread::currentThreadId();
connect(m_pthread, &QThread::finished, m_pworker, &QObject::deleteLater);
connect(this,SIGNAL(sig_dowork()),m_pworker,SLOT(slot_dowork()));
connect(m_pworker,SIGNAL(sig_finish()),this,SLOT(slot_finish()));
}
MainWindow::~MainWindow()
{
qDebug()<<"~mainwindow()";
delete ui;
m_pthread->quit();
m_pthread->wait();
}
void MainWindow::dowork()
{
m_pthread->start();
emit sig_dowork();
}
void MainWindow::slot_finish()
{
qDebug()<< "finish,thread id = " << QThread::currentThreadId();
}
//main.cpp
#include <QCoreApplication>
#include <QDebug>
#include <QThread>
#include <QString>
#include <QObject>
#include <QApplication>
#include "tes.h"
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
w.dowork();
return a.exec();
}
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