QT 线程的使用（继承QThread）

对于多线程而言，要注意资源的同步和互斥问题，但对于单独的一个线程，则只需要对它的run方法进行重写。

下面实现了一个简单的线程

widget.h文件

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QPushButton>
#include <QLineEdit>
#include <QHBoxLayout>
#include <QVBoxLayout>
#include <QTime>
#include <QTimer>
#include "mythread.h"

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = );
    ~Widget();

private slots:
    void settime();
    void startThread();

private:
    QPushButton *pb_start,*pb_stop;
    QLineEdit *le;

    QTimer *time;
    myThread *thread;
};

#endif // WIDGET_H

widget.cpp文件

#include "widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    pb_start = new QPushButton("start");
    pb_stop = new QPushButton("stop");

    le = new QLineEdit;
    le->setAlignment(Qt::AlignCenter);

    QTime t = QTime::currentTime();
    le->setText(t.toString("hh:mm:ss"));

    QHBoxLayout *hbox = new QHBoxLayout;
    hbox->addWidget(pb_start);
    hbox->addWidget(pb_stop);

    QVBoxLayout *vbox = new QVBoxLayout;
    vbox->addWidget(le);
    vbox->addLayout(hbox);

    setLayout(vbox);

    time = new QTimer;
    time->start();

    thread = new myThread;
    connect(time,SIGNAL(timeout()),this,SLOT(settime()));
    connect(pb_start,SIGNAL(clicked(bool)),this,SLOT(startThread()));
    connect(pb_stop,SIGNAL(clicked(bool)),thread,SLOT(terminate()));
}

Widget::~Widget()
{

}

void Widget::settime()
{
    QTime t = QTime::currentTime();
    le->setText(t.toString("hh:mm:ss"));
}

void Widget::startThread()
{
    thread->start();
}

mythread.h文件

#ifndef MYTHREAD_H
#define MYTHREAD_H

#include <QThread>
#include <QWidget>
#include <QDebug>

class myThread : public QThread
{
    Q_OBJECT
public:
    myThread();

protected:
    void run();
};

#endif // MYTHREAD_H

mythread.cpp文件

#include "mythread.h"

myThread::myThread()
{

}

void myThread::run()
{
    for(int i=; ;i++)
    {
        sleep();
        qDebug()<<"i = "<<i;
    }
}

运行结果