qt之线程

第一种创建:

mythread1.h:

#ifndef MYTHREAD_H

#define MYTHREAD_H

#include<QThread>

#include<QDebug>

class mythread:public QThread

{

public:

    mythread(const QString & s,QObject *parent=nullptr);

    void run();

    void working();

private:

    const QString &str;

};

#endif // MYTHREAD_H

mythread1.cpp:

#include "mythread.h"

#include<QDebug>

mythread::mythread(const QString & s,QObject *parent)

    :QThread (parent),str(s)

{

}

 void mythread::run()

 {

     working();

     //exec();

 }

 void  mythread::working()

 {

     for(int i=0;i<10;i++)

     {

         qDebug()<<str<<i<<QThread::currentThreadId()<<endl;

     }

 }

main.cpp:

#include "widget.h"

#include <QApplication>

#include "mythread.h"

#include<QDebug>

int main(int argc, char *argv[])

{

QApplication a(argc, argv);

mythread my("s1");

qDebug()<<"主线程在运行"<<endl;

my.start();

qDebug()<<"主线程在运行"<<endl;

qDebug()<<"主线程在运行"<<endl;

qDebug()<<"主线程在运行"<<endl;

qDebug()<<"主线程在运行"<<endl;

qDebug()<<"主线程在运行"<<endl;

qDebug()<<"主线程在运行"<<endl;

qDebug()<<"主线程在运行"<<endl;

qDebug()<<"主线程在运行"<<endl;

qDebug()<<my.wait()<<endl;

//Widget add;

//add.show();

//    return a.exec();

}

效果:

第二种创建：

,mythread2.h:

#ifndef MYTHREAD2_H

#define MYTHREAD2_H

#include <QObject>

class MyThread2 : public QObject

{

    Q_OBJECT

public:

    explicit MyThread2(const QString& s,QObject *parent = nullptr);

signals:

public slots:

    void working1();

    void working2();

private:

    QString str;

};

#endif // MYTHREAD2_H

mythread2.cpp:

#include "mythread2.h"

#include<QDebug>

#include<QThread>

MyThread2::MyThread2(const QString& s,QObject *parent)

    : QObject(parent),str(s){}

 void MyThread2::working1()

 {

     for(int i=0;i<10;i++)

     {

         qDebug()<<str<<i<<QThread::currentThreadId()<<"working1"<<endl;

     }

 }

 void MyThread2::working2()

 {

     for(int i=0;i<10;i++)

     {

         qDebug()<<str<<i<<QThread::currentThreadId()<<"working2"<<endl;

     }

 }

widget.h:

#ifndef WIDGET_H

#define WIDGET_H

#include<QThread>

#include <QWidget>

#include<QPushButton>

#include "mythread2.h"

class Widget : public QWidget

{

    Q_OBJECT

public:

    Widget(QWidget *parent = 0);

    ~Widget();

private:

    MyThread2 * mythread;

    QThread * ms;

};

#endif // WIDGET_H

widget.cpp:

#include "widget.h"

#include<QHBoxLayout>

#include<QThread>

#include<QObject>

#include<QDebug>

Widget::Widget(QWidget *parent)

    : QWidget(parent)

{

     QHBoxLayout *s=new QHBoxLayout(this);

      QPushButton *s1=new QPushButton("确定");

      QPushButton *s2=new QPushButton("取消");

      s->addWidget(s1);

      s->addWidget(s2);

    mythread=new MyThread2("mythread is starting...");

    ms=new QThread(this);

    mythread->moveToThread(ms);

    ms->start();

    connect(s1,SIGNAL(clicked()),mythread,SLOT(working1()));

    connect(s2,SIGNAL(clicked()),mythread,SLOT(working2()));

   connect(ms,SIGNAL(finished()),mythread,SLOT(deleteLater()));

}

Widget::~Widget()

{

    qDebug()<<"~Widget()"<<endl;

    ms->quit();

    ms->wait();

}

main.cpp:

#include "widget.h"

#include <QApplication>

#include "mythread.h"

#include<QDebug>

int main(int argc, char *argv[])

{

QApplication a(argc, argv);

//mythread my("s1");

//qDebug()<<"主线程在运行"<<endl;

//my.start();

//qDebug()<<"主线程在运行"<<endl;

//qDebug()<<"主线程在运行"<<endl;

//qDebug()<<"主线程在运行"<<endl;

//qDebug()<<"主线程在运行"<<endl;

//qDebug()<<"主线程在运行"<<endl;

//qDebug()<<"主线程在运行"<<endl;

//qDebug()<<"主线程在运行"<<endl;

//qDebug()<<"主线程在运行"<<endl;

//qDebug()<<my.wait()<<endl;

Widget add;

add.show();

    return a.exec();

}

效果:

巴特西

qt之线程

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