基本思想
- 在主線程中，哪里需用多線程，就在哪里創建一個QThread實例；
- 把耗時操作封裝到一個繼承於QObject的子類(這里叫做工作類Worker)槽函數中；
- 創建QThread實例和Worker實例，建立他們之間的信號和槽關系；
- 調用Worker實例的moveToThread(QThread * thread)函數，將它移動到創建的QThread線程中去；
- 最后，執行QThread線程的start()方法。
工作類
worker.h
1 #ifndef WORKER_H 2 #define WORKER_H
3 #include <QObject>
4 class Worker : public QObject 5 { 6 Q_OBJECT 7 public: 8 explicit Worker(QObject *parent = 0); 9 signals: 10 void complete(); 11 public slots: 12 void doLongTimeWork();//耗時操作
13 }; 14 #endif // WORKER_H
worker.cpp
1 #include "worker.h"
2 #include <QDebug>
3 #include <QThread>
4 Worker::Worker(QObject *parent) : QObject(parent) 5 { 6
7 } 8 void Worker::doLongTimeWork() 9 { 10 qDebug()<<__LINE__<<__FUNCTION__<<" - enter"; 11 qint64 count = 100; 12 while(count--){ 13 QThread::msleep(10); 14 qDebug()<<__LINE__<<__FUNCTION__<<"count = "<<count; 15 } 16 emit complete(); 17 qDebug()<<__LINE__<<__FUNCTION__<<" - leave"; 18 }
使用方法
1 void MainWindow::on_pushButtonDoWork_clicked() 2 { 3 Worker* worker = new Worker(); 4 QThread* thread = new QThread(); 5 //當線程啟動時，執行Worker類的耗時函數doLongTimeWork()
6 connect(thread,SIGNAL(started()),worker,SLOT(doLongTimeWork())); 7 //當耗時函數執行完畢，發出complete()信號時，刪除worker實例
8 connect(worker,SIGNAL(complete()),worker,SLOT(deleteLater())); 9 //當worker對象實例銷毀時，退出線程
10 connect(worker,SIGNAL(destroyed(QObject*)),thread,SLOT(quit())); 11 //當線程結束時，銷毀線程對象實例
12 connect(thread,SIGNAL(finished()),thread,SLOT(deleteLater())); 13 //移動worker對象實例到線程中
14 worker->moveToThread(thread); 15 //啟動線程
16 thread->start(); 17 }