Qt中使用多线程并返回结果到主线程的例子

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#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QDateTime>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    //子线程1
    Worker *worker = new Worker;
    worker->moveToThread(&workerThread1);
    connect(&workerThread1, &QThread::finished, worker, &QObject::deleteLater);
    connect(this, &MainWindow::operate, worker, &Worker::doWork);
    connect(worker, &Worker::resultReady, this, &MainWindow::handleResults);
    workerThread1.start();

    //子线程2
    Worker *worker2 = new Worker;
    worker2->moveToThread(&workerThread2);
    connect(&workerThread2, &QThread::finished, worker2, &QObject::deleteLater);
    connect(this, &MainWindow::operate2, worker2, &Worker::doWork2);//关联主线程与子线程的信号和槽
    connect(worker2, &Worker::resultReady2, this, &MainWindow::handleResults2);//关联子线程与主线程的信号和槽
    workerThread2.start();
}

MainWindow::~MainWindow()
{
    delete ui;
    workerThread1.quit();
    workerThread1.wait();

    workerThread2.quit();
    workerThread2.wait();


}
void MainWindow::handleResults(const QString &str)
{
    ui->lineEdit->setText(str);
    qDebug()<<"MainWindow::handleResults收到的内容是："<<str<<endl;

}
void MainWindow::handleResults2(const QString &str)
{
    ui->lineEdit_2->setText(str);
    qDebug()<<"MainWindow::handleResults2收到的内容是："<<str<<endl;

}
void Worker::doWork(const QString &str) {

    qDebug()<<"收到的内容是："<<str<<endl;
    emit resultReady(str);//在子线程中发射信号，驱动主线程的槽函数
}
void Worker::doWork2(const QString &str) {

    qDebug()<<"收到的内容是："<<str<<endl;
    emit resultReady2(str);//在子线程中发射信号，驱动主线程的槽函数
}
void MainWindow::on_pushButton_clicked()
{
    emit operate(QDateTime::currentDateTime().toString("yyyy-MM-dd HH:mm:ss")+"进程1发射了信号!");//在主线程中发射信号，驱动子线程的槽函数，在子线程中做大量逻辑处理
    emit operate2(QDateTime::currentDateTime().toString("yyyy-MM-dd HH:mm:ss")+"进程2发射了信号!");//在主线程中发射信号，驱动子线程的槽函数，在子线程中做大量逻辑处理
}

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#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QThread>
#include <QObject>
#include <QThread>

class Worker : public QObject
  {
      Q_OBJECT
  public slots:
      void doWork(const QString &str);
      void doWork2(const QString &str);
  signals:
      void resultReady(const QString &result);
      void resultReady2(const QString &result);
  };
QT_BEGIN_NAMESPACE
namespace Ui {
    class MainWindow;
}
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
    Q_OBJECT
    QThread workerThread1;
    QThread workerThread2;
public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();
private slots:
    void on_pushButton_clicked();
    void handleResults(const QString &str);
    void handleResults2(const QString &str);
signals:
    void operate(const QString &str);
    void operate2(const QString &str);
private:
    Ui::MainWindow *ui;
};
#endif

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#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}