多线程案例

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#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include "subthread.h"

#include <QThread>

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

    Q_OBJECT

public:

    explicit MainWindow(QWidget *parent = 0);

    ~MainWindow();

private slots:

    void on_btn_clicked();

    void receiveData(int cd);

private:

    Ui::MainWindow *ui;

        QThread *thread;

};

#endif // MAINWINDOW_H

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include "subthread.h"

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    thread=new QThread();

    subthread *st=new subthread();

    st->moveToThread(thread);

    connect(thread,QThread::finished,st,subthread::deleteLater);

    connect(thread,QThread::started,st,subthread::Run);

    connect(st,subthread::sendData,this,MainWindow::receiveData);

}

MainWindow::~MainWindow()

{

    delete ui;

    thread->deleteLater();

}

void MainWindow::on_btn_clicked()

{

    thread->start();

    ui->btn->setDisabled(true);

}

void MainWindow::receiveData(int cd)

{

    ui->textEdit1->append(QString::number(cd));

}

#ifndef SUBTHREAD_H

#define SUBTHREAD_H

#include <QObject>

class subthread : public QObject

{

    Q_OBJECT

public:

    explicit subthread(QObject *parent = nullptr);

signals:

    void sendData(int cnt);

public slots:

    void Run();

};

#endif // SUBTHREAD_H

#include "subthread.h"

#include <QThread>

subthread::subthread(QObject *parent) : QObject(parent)

{

}

void subthread::Run()

{

    int cnt=10;

    while(cnt>0)

    {

    emit sendData(cnt--);

        QThread::msleep(100);

    }

    QThread::currentThread()->quit();

}