QThread创建多线程程序

最近在阅读Qt 5.9 C++开发指南，为了加深对书本上内容的理解，参照书上的讲解尝试写了一些demo，用于以后工作中查阅，如果涉及侵权请告知，实例程序samp13_1

mythread.h

#ifndef MYTHREAD_H

#define MYTHREAD_H

#include <QThread>

class MyThread : public QThread

{

    Q_OBJECT

private:

    int _times;

    int _value;

protected:

    void run();

public:

    MyThread();

    ~MyThread();

signals:

    void timesValueChanged(int times, int value);

};

#endif // MYTHREAD_H

mythread.cpp

#include "mythread.h"

#include <QRandomGenerator>

MyThread::MyThread()

{

    _times = ;

    _value = ;

}

MyThread::~MyThread()

{

}

// 这个是通过信号与槽与主窗口进行交互的，还有一种方法是通过函数

void MyThread::run()

{

    while()

    {

        _value = QRandomGenerator::global()->generate(); // 用这个类生成随机数

        _value = (_value % ) + ;

        // 这个类生成的数可能是负数，如果是负数就从新生成

        if(_value <= )

        {

            continue;

        }

        _times = _times + ;

        emit timesValueChanged(_times, _value); // 发信号给主窗口，叫他显示

        msleep(); // 先睡一会儿在生成数字

    }

}

mydialog.h

#ifndef MYDIALOG_H

#define MYDIALOG_H

#include <mythread.h>

#include <QDialog>

#include <QPushButton>

#include <QPlainTextEdit>

#include <QLabel>

class MyDialog : public QDialog

{

    Q_OBJECT

private:

    QPushButton *_btnStart;

    QPushButton *_btnFinish;

    QPushButton *_btnClearInfo;

    QPlainTextEdit *_plainTextEdit;

    QLabel *_labStatus;

    QLabel *_labPicture;

    MyThread *_thread;

protected:

    void closeEvent(QCloseEvent *event);

public:

    MyDialog(QWidget *parent = nullptr);

    ~MyDialog();

    void iniUI();

    void iniSignalSlots();

private slots:

    void btnStartClicked();

    void btnFinishClicked();

    void btnClearInfoClicked();

    void timesValueChanged(int times, int value);

};

#endif // MYDIALOG_H

mydialog.cpp

#include "mydialog.h"

#include <QHBoxLayout>

#include <QVBoxLayout>

#include <QGroupBox>

#include <QPixmap>

#include <QString>

MyDialog::MyDialog(QWidget *parent) : QDialog(parent)

{

    iniUI();

    //创建线程

    _thread = new MyThread();

    iniSignalSlots();

}

MyDialog::~MyDialog()

{

}

// 初始化界面

void MyDialog::iniUI()

{

    // 创建按钮

    _btnStart = new QPushButton("启动游戏");

    _btnFinish = new QPushButton("结束游戏");

    _btnFinish->setEnabled(false);

    _btnClearInfo = new QPushButton("清空文本");

    // 布局按钮

    QHBoxLayout *layout1 = new QHBoxLayout();

    layout1->addWidget(_btnStart);

    layout1->addWidget(_btnFinish);

    layout1->addWidget(_btnClearInfo);

    // 创建文本框和图片显示框

    _plainTextEdit = new QPlainTextEdit();

    _labPicture = new QLabel();

    QPixmap pixmap;

    pixmap.load(":/images/d0.jpg");

    _labPicture->setPixmap(pixmap);

    // 布局文本框和图片显示框

    QHBoxLayout *layout2 = new QHBoxLayout();

    layout2->addWidget(_plainTextEdit);

    layout2->addWidget(_labPicture);

    // 创建状态栏

    _labStatus = new QLabel("游戏状态：未开始");

    // 布局状态栏

    QHBoxLayout *layout3 = new  QHBoxLayout();

    layout3->addWidget(_labStatus);

    // 创建分组框的布局

    QVBoxLayout *layout4 = new QVBoxLayout();

    layout4->addLayout(layout1);

    layout4->addLayout(layout2);

    layout4->addLayout(layout3);

    // 创建一个分组框

    QGroupBox *groupBox = new QGroupBox("掷骰子");

    groupBox->setLayout(layout4);

    // 创建整体布局

    QHBoxLayout *layout5 = new QHBoxLayout();

    layout5->addWidget(groupBox);

    // 设置整体布局

    setLayout(layout5);

    resize(, );

}

// 连接信号与槽

void MyDialog::iniSignalSlots()

{

    connect(_btnStart, SIGNAL(clicked()), this, SLOT(btnStartClicked()));

    connect(_btnFinish, SIGNAL(clicked()), this, SLOT(btnFinishClicked()));

    connect(_btnClearInfo, SIGNAL(clicked()), this, SLOT(btnClearInfoClicked()));

    connect(_thread, SIGNAL(timesValueChanged(int, int)), this, SLOT(timesValueChanged(int, int)));

}

void MyDialog::btnStartClicked()

{

    _labStatus->setText("游戏状态：进行中");

    _thread->start();

    _btnStart->setEnabled(false);

    _btnFinish->setEnabled(true);

}

void MyDialog::btnFinishClicked()

{

    _labStatus->setText("游戏状态：未开始");

    _thread->terminate();

    _thread->wait();

    _btnStart->setEnabled(true);

    _btnFinish->setEnabled(false);

}

void MyDialog::btnClearInfoClicked()

{

    _plainTextEdit->clear();

}

// 当用户点击开始游戏后，线程就启动了，当线程生成一个数字时，会发一个信号过来，这个槽函数接受信号做出响应

void MyDialog::timesValueChanged(int times, int value)

{

    QString text = QString::asprintf("第%d次掷骰子，点数为：%d", times, value);

    _plainTextEdit->appendPlainText(text);

    QString filename = QString::asprintf(":/images/d%d.jpg", value);

    QPixmap pixmap;

    pixmap.load(filename);

    _labPicture->setPixmap(pixmap); // 给一个label设置图片

}

void MyDialog::closeEvent(QCloseEvent *event)

{

    if(_thread->isRunning()) // 如果线程还在继续执行，那么强行终止

    {

        _thread->terminate();

        _thread->wait();

    }

    event->accept();

}

main.cpp

#include "mydialog.h"

#include <QApplication>

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

{

    QApplication a(argc, argv);

    MyDialog w;

    w.show();

    return a.exec();

}

效果展示

巴特西

QThread创建多线程程序

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