QT实现多线程两种方式案例详解

class MyThread：public QThread{
public:
    vid run();	//虚函数  线程处理函数（和主线程不在同一个线程）
    
signals:
    void isDone();	//信号 线程执行完发送
}
void MyThread::run() {
    // 实现  -- 复杂的处理过程
    
    emit isDome;	// 发送线程
};

MyThread thread;

thread.start();

public:
	void dealDone();
——————————————————————
void Widget::dealDone(){
    // 线程结束后的操作
}

connect(&thread,&MyThread::isDone,this,&Widget::dealDone);

void Widget::stopThread(){
    // 停止线程
    thread->quit();
    // 等待线程运行完成之后结束
    thread->wait();
}

connect(this,&Widget::destroyed,this,&Widget::stopThread);

class MyThread : public QObject
{
    Q_OBJECT
public:
    explicit MyThread(QObject *parent = nullptr);

    void run();
    void start();
    void stop();

signals:
    void myThreadrun();

private:
    bool isrun;
public slots:
};
void MyThread::run(){
    while(isrun == true) {
        QThread::sleep(1);
        emit myThreadrun();
        qDebug() << "子线程：" << QThread::currentThread();
        if(isrun == false) break;
    }
}
void MyThread::start() {
    qDebug() << "开始";
    this->isrun = true;
}

void MyThread::stop(){
    qDebug() << "停止";
    this->isrun = false;
}

MyThread *mythread;
QThread *thread;
-------------------------------------------------------------------------------------------
this->mythread = new MyThread;
this->thread = new QThread(this);

void Widget::dealThread() {
    static int i = 0;
    i++;
    ui->lcdNumber->display(i);
}
void Widget::on_pushButton_strat_clicked()
{
    if(thread->isRunning() == true){
        return;
    }
    thread->start();
    mythread->start();
    emit runThread();

}
void Widget::on_pushButton_stop_clicked()
{
    if(thread->isRunning() == false){
        return;
    }
    mythread->stop();
    thread->quit();
    thread->wait();
}
void Widget::dealThreadclose() {
    on_pushButton_stop_clicked();
    delete mythread;
}

6. 启动子线程，只是把线程启动了，并没有启动线程处理函数。

```C++
connect(mythread,&MyThread::myThreadrun,this,&Widget::dealThread);
connect(this,&Widget::runThread,mythread,&MyThread::run);
qDebug() << "主线程：" << QThread::currentThread();
connect(this,&Widget::destroyed,this,&Widget::dealThreadclose);