开源 C++ QT Widget 开发（七）线程--多线程及通讯

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <mythread.h>
#include <secondthread.h>
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    MyThread * firstThread;
    SecondThread * seThread;
private:
    Ui::MainWindow *ui;
private slots:
    void firstSlot(QString t);
    void secondSlot(QString t);

};

#endif // MAINWINDOW_H

2.2 mainwindow.cpp文件

复制代码

#include "mainwindow.h"
#include "ui_mainwindow.h"
/*
 程序包括1个主线程，2个子线程。
 实现子线程发送数据给主线程，
 子线程发送数据给子线程。
 * */
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    firstThread = new MyThread;
    //connect(firstThread,SIGNAL(sendTime(QString)),this,SLOT(firstSlot(QString)));
    connect(firstThread,&MyThread::sendTime,this,&MainWindow::firstSlot);


    seThread = new SecondThread;
    //connect(firstThread,SIGNAL(sendTime(QString)),this,SLOT(firstSlot(QString)));
    connect(seThread,&SecondThread::sendTime,this,&MainWindow::secondSlot);

    connect(firstThread,&MyThread::firstTOsecond,seThread,&SecondThread::dealfirstTOsecond);

    firstThread->start();
    seThread->start();

}
void MainWindow::firstSlot(QString t)
{
    qDebug()<<"firstSlot"<<t;
}
void MainWindow::secondSlot(QString t)
{
    qDebug()<<"secondSlot"<<t;
}

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

2.3 mythread.h文件

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#ifndef MYTHREAD_H
#define MYTHREAD_H
#include <QThread>
#include <QObject>
#include <QDebug>
#include <QTime>
class MyThread : public QThread
{
    Q_OBJECT
public:
    MyThread();
protected:
    void run();
signals:
    void sendTime(QString);
    void firstTOsecond(QString);
};

#endif // THREAD1_H

2.4 mythread.cpp文件

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#include "mythread.h"

MyThread::MyThread()
{
    qDebug()<<"Thread Start!"<<currentThreadId();
}
void MyThread::run()
{

    int i = 0;
    QString str;
    while(1)
    {
        qDebug()<<"first Run()!"<<currentThreadId();
        QString t = QTime::currentTime().toString("hh:mm:ss");

        //qDebug()<<i<<":"<<QDateTime::currentDateTime();
        emit sendTime(t);
        str = QString::number(i,10);

        emit firstTOsecond("123");
        msleep(100);  // 延迟1s 凸显效果

    }
}

2.5 secondthread.h文件

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#ifndef SECONDTHREAD_H
#define SECONDTHREAD_H
#include <QThread>
#include <QObject>
#include <QDebug>
#include <QTime>
#include <QEvent>
#include <QCoreApplication>
class SecondThread : public QThread
{
    Q_OBJECT
public:
    SecondThread();

protected:
    void run();
signals:
    void sendTime(QString);
public slots:
    void dealfirstTOsecond(QString t);
};

#endif // THREAD1_H

2.6 sencondthread.cpp文件

复制代码

#include "secondthread.h"

SecondThread::SecondThread()
{
    qDebug()<<"Thread Start!"<<currentThreadId();
}
void SecondThread::run()
{

    int i = 0;
    while(1)
    {
        qDebug()<<"second Run()!"<<currentThreadId();
        QString t = QTime::currentTime().toString("hh:mm:ss");

        //qDebug()<<i<<":"<<QDateTime::currentDateTime();
        emit sendTime(t);
        msleep(1000);  // 延迟1s 凸显效果

    }
}
void SecondThread::dealfirstTOsecond(QString t)
{
    qDebug()<<"deal"<<t;
}

三、显示效果