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QT创建线程

news 2026/6/5 7:16:02

1、使用Worker + moveToThread的方式将任务移动到线程实例对象中。

（1）创建循环子线程

#ifndef WORKER_H #define WORKER_H #include <QObject> #include <chrono> #include <QThread> #include <QDebug> class Worker:public QObject { Q_OBJECT public: explicit Worker(QObject* parent = nullptr); public slots: void doWork(); signals: void workFinished(); }; #endif #include "Worker.h" Worker::Worker(QObject* parent):QObject(parent) { } void Worker::doWork() { int a = 0; qDebug()<< "子线程ID：" << QThread::currentThreadId(); while(1) { std::this_thread::sleep_for(std::chrono::seconds(1)); qDebug() << a++; if(a > 10) break; } //任务完成，退出 emit workFinished(); } #include <QCoreApplication> #include <QThread> #include <QTimer> #include <QDebug> #include "Worker.h" int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); //获取主线程id qDebug() << "主线程ID：" <<QThread::currentThreadId(); //创建线程实例 QThread* taskThread = new QThread(); //创建任务对象 Worker* worker = new Worker(); //将任务对象worker移动到线程实例中 worker->moveToThread(taskThread); QObject::connect(taskThread,&QThread::started,worker,&Worker::doWork);//任务开始 QObject::connect(worker,&Worker::workFinished,taskThread,&QThread::quit);//退出线程 QObject::connect(taskThread,&QThread::finished,taskThread,&QThread::deleteLater);//清理线程对象 QObject::connect(taskThread,&QThread::finished,worker,&QThread::deleteLater);//清理任务对象 //启动子线程 taskThread->start(); return a.exec(); }

（2）创建非循环子线程，在子线程中使用定时器。

#ifndef WORKER_H #define WORKER_H #include <QObject> #include <chrono> #include <QThread> #include <QDebug> #include <QTimer> class Worker:public QObject { Q_OBJECT public: explicit Worker(QObject* parent = nullptr); public slots: void doLoopWork(); void startTimer();//在子线程中启动定时器 private slots: void doTimerWork(); signals: void workFinished(); private: QTimer* timer = nullptr; }; #endif #include "Worker.h" Worker::Worker(QObject* parent):QObject(parent) { } void Worker::doLoopWork() { int a = 0; qDebug()<< "子线程ID：" << QThread::currentThreadId(); while(1) { std::this_thread::sleep_for(std::chrono::seconds(1)); qDebug() << a++; if(a > 10) break; } //任务完成，退出 emit workFinished(); } void Worker::startTimer() { qDebug() << "启动定时器，线程ID：" << QThread::currentThreadId(); timer = new QTimer(this); timer->setInterval(1000); QObject::connect(timer,&QTimer::timeout,this,&Worker::doTimerWork); timer->start(); } void Worker::doTimerWork() { static int a = 0; qDebug() << ++a; if(a > 10) { if(timer) { timer->stop(); } } } #include <QCoreApplication> #include <QThread> #include <QTimer> #include <QDebug> #include "Worker.h" int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); //获取主线程id qDebug() << "主线程ID：" <<QThread::currentThreadId(); //创建线程实例 QThread* taskThread = new QThread(); //创建任务对象 Worker* worker = new Worker(); //将任务对象worker移动到线程实例中 worker->moveToThread(taskThread); QObject::connect(taskThread,&QThread::started,worker,&Worker::startTimer);//任务开始 QObject::connect(worker,&Worker::workFinished,taskThread,&QThread::quit);//退出线程 QObject::connect(taskThread,&QThread::finished,taskThread,&QThread::deleteLater);//清理线程对象 QObject::connect(taskThread,&QThread::finished,worker,&QThread::deleteLater);//清理任务对象 //启动子线程 taskThread->start(); return a.exec(); }

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