QThread run() 函数线程示例使用记录

#ifndef QDICETHREAD_H

#define QDICETHREAD_H

#include <QObject>

#include <QThread>

#include <QTime>

class QDiceThread : public QThread

{

    Q_OBJECT

public:

    explicit QDiceThread(QObject *parent = nullptr);

    void diceBegin();

    void dicePause();

    void stopThread();

protected:

    void run() Q_DECL_OVERRIDE;

signals:

    void newValue(int seq, int diceValue); //产生新点数的信号

public slots:

private:

    int m_seq = 0;  //骰子次数序号

    int m_diceValue; //骰子点数

    bool m_pause = true; // 暂停

    bool m_stop = false; //停止

};

#endif // QDICETHREAD_H

#include "qdicethread.h"

#include <QDebug>

QDiceThread::QDiceThread(QObject *parent) : QThread(parent)

{

}

void QDiceThread::diceBegin()

{

    m_pause = false;

}

void QDiceThread::dicePause()

{

    m_pause = true;

}

void QDiceThread::stopThread()

{

    m_stop = true;

}

void QDiceThread::run()

{

    qDebug() << "sdasdsd";

    qDebug() << QThread::currentThreadId();

    m_stop = false;

    m_seq =0;

    qsrand(QTime::currentTime().msec()); //随机数初始化

    while(!m_stop)

    {

        if(!m_pause)

        {

            m_diceValue =qrand();

            m_diceValue = (m_diceValue %6)+1 ;

            m_seq++;

            emit newValue(m_seq,m_diceValue);

        }

        msleep(500);

    }

    quit(); //相当于exit（0）,退出线程的时间循环

}

#ifndef DIALOG_H

#define DIALOG_H

#include <QDialog>

#include "qdicethread.h"

namespace Ui {

class Dialog;

}

class Dialog : public QDialog

{

    Q_OBJECT

private:

    QDiceThread threadA;

protected:

    void closeEvent(QCloseEvent *event);

public:

    explicit Dialog(QWidget *parent = 0);

    ~Dialog();

private slots:

    void onthreadA_start();

    void onthreadA_finish();

    void onThreadA_newValue(int seq,int diceValue);

    void on_btnThreadBegin_clicked();

    void on_btnThreadStop_clicked();

    void on_btnDicestart_clicked();

    void on_btnDiceStop_clicked();

    void on_btnClear_clicked();

private:

    Ui::Dialog *ui;

};

#endif // DIALOG_H

#include "dialog.h"

#include "ui_dialog.h"

#include <QDebug>

Dialog::Dialog(QWidget *parent) :

    QDialog(parent),

    ui(new Ui::Dialog)

{

    ui->setupUi(this);

    connect(&threadA,SIGNAL(started()),this,SLOT(onthreadA_start()));

    connect(&threadA,SIGNAL(finished()),this,SLOT(onthreadA_finish()));

    connect(&threadA,SIGNAL(newValue(int,int)),this,SLOT(onThreadA_newValue(int,int)));

}

Dialog::~Dialog()

{

    delete ui;

}

void Dialog::onthreadA_start()

{

    ui->label_2->setText("Thread状态：thread start.");

}

void Dialog::onthreadA_finish()

{

    ui->label_2->setText("Thread状态：thread finish.");

}

void Dialog::onThreadA_newValue(int seq, int diceValue)

{

    QString str=QString::asprintf("第%d次，点数为%d",seq,diceValue);

    ui->plainTextEdit->appendPlainText(str);

    QPixmap pic;

    QString fileName=QString::asprintf(":./images/d%d.jpg",diceValue);

    pic.load(fileName);

    ui->label->setPixmap(pic);

}

void Dialog::on_btnThreadBegin_clicked()

{

    threadA.start();

    ui->btnThreadBegin->setEnabled(false);

    ui->btnThreadStop->setEnabled(true);

    ui->btnDiceStop->setEnabled(false);

    ui->btnDicestart->setEnabled(true);

}

void Dialog::on_btnThreadStop_clicked()

{

    threadA.stopThread();

    threadA.wait();

    ui->btnThreadBegin->setEnabled(true);

    ui->btnThreadStop->setEnabled(false);

    ui->btnDiceStop->setEnabled(false);

    ui->btnDicestart->setEnabled(false);

}

void Dialog::on_btnDicestart_clicked()

{

    threadA.diceBegin();

    ui->btnDicestart->setEnabled(false);

    ui->btnDiceStop->setEnabled(true);

}

void Dialog::on_btnDiceStop_clicked()

{

    threadA.dicePause();

    ui->btnDicestart->setEnabled(true);

    ui->btnDiceStop->setEnabled(false);

}

void Dialog::on_btnClear_clicked()

{

    ui->plainTextEdit->clear();

}

void Dialog::closeEvent(QCloseEvent *event)

{

    if(threadA.isRunning())

    {

        threadA.stopThread();

        threadA.wait();

    }

    event->accept();

}