QT多线程的使用

今天给大家介绍三种qt里面使用多线程的方法

1、继承qthread并且重写run方法来实现多线程

#ifndef myqthread_h
#define myqthread_h

#include <qthread>
class myqthread : public qthread
{
public:
    myqthread();

    void run();
};

#endif // myqthread_h

2、使用movetothread方法实现多线程，该类一定要继承qobject

#ifndef myobjectthread_h
#define myobjectthread_h

#include <qobject>

class myobjectthread : public qobject
{
    q_object
public:
    explicit myobjectthread(qobject *parent = nullptr);

signals:

public slots:
    void showid();
};

#endif // myobjectthread_h

3、使用c++11的thread来实现多线程

#ifndef myc11thread_h
#define myc11thread_h


class myc11thread
{
public:
    myc11thread();

    void showc11id(int i);
};

#endif // myc11thread_h

4、来看一看这三种多线程如何使用

void showid(int i)
{
    qdebug() << "全局函数的现成id" << qthread::currentthreadid() << "i:" << i;
}
mainwindow::mainwindow(qwidget *parent) :
    qmainwindow(parent),
    ui(new ui::mainwindow)
{
    ui->setupui(this);
    //qthread重写runfangfa
    tmpmyqthread = new myqthread();
    tmpmyqthread->start();

    //用movetothread，但是这个类要继承object
    qthread *th = new qthread;
    tmpmyobject = new myobjectthread();
    //把tmpmyobject这个类的对象放到线程中
    tmpmyobject->movetothread(th);
    //通过信号槽的方法，把槽函数运行在线程中
    connect(th,signal(started()),tmpmyobject,slot(showid()));
    th->start();

    //c11原始的thread把全局函数初始化到线程
    std::thread th1(showid,2);
    th1.detach();

    //c11原始thread把类的函数初始化到线程运行
    tmpmyc11 = new myc11thread();
    std::thread th2(&myc11thread::showc11id,tmpmyc11,2);
    th2.detach();
    qdebug() << "mainthread:" << qthread::currentthreadid();
}

 

qt里面三种多线程介绍到这里