QT 线程调用的方法

//main 函数内容

#include "widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();

    return a.exec();
}

//Widget 内容

#include "widget.h"
#include "ui_widget.h"
#include <QThread>
#include <QDebug>
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    falg_stop_or_action = 0;
    ui->lcdNumber->display(20);
    // not zhiding father
    pthread_my = new mypthread;
    thread = new QThread(this);
    pthread_my->moveToThread(thread); //这个地方 是精髓
   //这个是线程函数在执行的时候 发来一个信号  主要是来看现象
    connect(pthread_my,&mypthread::mysignal,this,&Widget::dealsingnal);
    connect(&timer,&QTimer::timeout,this,&Widget::dealtimer);
   //主动发信号去调用 线程函数  
    connect(this,&Widget::startpthread,pthread_my,&mypthread::myTimerout);
}

Widget::~Widget()
{
    delete ui;
}

void Widget::on_pushButton_send_stop_clicked()
{
    pthread_my->setFlag(true);
    if(falg_stop_or_action == 0)
    {
        falg_stop_or_action = 1;
        timer.start(1000);

    }
    qDebug()<< "pthread ID" <<thread->currentThread();
    //Start pthread
    thread->start();
    emit startpthread();


}

void Widget::on_pushButton_2_clicked()
{
    //停止按钮的 槽函数 
    falg_stop_or_action = 0;
    timer.stop();

    pthread_my->setFlag(false);
//下面这两部 少了啥都不能调用这个线程
    thread->quit();
    thread->wait();
}


void Widget::dealsingnal()
{
   //线程发来信号  打印一下
    qDebug()<< "pthread aciton" ;
}

void Widget::dealtimer()
{
 //用了一个LCD的计时器 一样的东西来观察现象
      static int i = 0;
      ui->lcdNumber->display(++i);
}

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QTimer>
#include "mypthread.h"

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
    void dealsingnal();
    void dealtimer();
signals:
    void startpthread();
private slots:
    void on_pushButton_send_stop_clicked();

    void on_pushButton_2_clicked();

private:
    Ui::Widget *ui;
    QTimer timer;
    mypthread * pthread_my;
    QThread * thread;
    // 0 stop  1 action
    char falg_stop_or_action;
};

#endif // WIDGET_H

 

// mypthread 内容

#include "mypthread.h"
#include <QThread>
#include <QDebug>
mypthread::mypthread(QObject *parent) : QObject(parent)
{
    isstop = true;
}

void mypthread::myTimerout()
{
    qDebug()<< "pthread aciton"<<QThread::currentThread();
    while(isstop)
    {
        QThread::sleep(1);
        emit mysignal();
    }
}

void mypthread::setFlag(bool s)
{
    isstop = s;
}

#ifndef MYPTHREAD_H
#define MYPTHREAD_H

#include <QObject>

class mypthread : public QObject
{
    Q_OBJECT
public:
    explicit mypthread(QObject *parent = 0);
    void myTimerout();
    void setFlag(bool s);

signals:
    void mysignal();

public slots:
private:
   bool  isstop;

};

#endif // MYPTHREAD_H