多線程

2019-11-08 20:12:05

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寫一個線程類，繼承QThread//workthread.h#ifndef WORKTHREAD_H#define WORKTHREAD_H#include <QThread>class WorkThread : public QThread{ Q_OBJECTpublic: WorkThread();PRotected: //重寫run函數,業務邏輯寫在該函數中 void run(); };#endif // WORKTHREAD_H//workthread.cpp#include "workthread.h"#include <QtDebug>WorkThread::WorkThread(){}void WorkThread::run(){ while(true) { for(int n=0;n<10;n++) qDebug()<<n<<n<<n<<n<<n<<n<<n<<n; }}

2、編寫一個自定義Dialog

//threaddlg.h#ifndef THREADDLG_H#define THREADDLG_H#include <QDialog>#include <QPushButton>#include "workthread.h"#define MAXSIZE 5class ThreadDlg : public QDialog{ Q_OBJECTpublic: ThreadDlg(QWidget *parent = 0); ~ThreadDlg(); private: QPushButton *startBtn; QPushButton *stopBtn; QPushButton *quitBtn;public slots: void slotStart(); void slotStop();private: WorkThread *workThread[MAXSIZE];};#endif // THREADDLG_H//threaddlg.cpp#include "threaddlg.h"#include <QHBoxLayout>ThreadDlg::ThreadDlg(QWidget *parent) : QDialog(parent){ setWindowTitle(tr("線程")); startBtn = new QPushButton(tr("開始")); stopBtn = new QPushButton(tr("停止")); quitBtn = new QPushButton(tr("退出")); QHBoxLayout *mainLayout = new QHBoxLayout(this); mainLayout->addWidget(startBtn); mainLayout->addWidget(stopBtn); mainLayout->addWidget(quitBtn); connect(startBtn,SIGNAL(clicked()),this,SLOT(slotStart())); connect(stopBtn,SIGNAL(clicked()),this,SLOT(slotStop())); connect(quitBtn,SIGNAL(clicked()),this,SLOT(close()));}ThreadDlg::~ThreadDlg(){}void ThreadDlg::slotStart(){ for(int i=0;i<MAXSIZE;i++) { workThread[i]=new WorkThread(); } for(int i=0;i<MAXSIZE;i++) { workThread[i]->start(); //啟動線程 } startBtn->setEnabled(false); stopBtn->setEnabled(true);}void ThreadDlg::slotStop(){ for(int i=0;i<MAXSIZE;i++) { workThread[i]->terminate(); //終止線程，但是并不會馬上，要根據系統調度 workThread[i]->wait(); //阻塞線程，等待系統終止線程 } startBtn->setEnabled(true); stopBtn->setEnabled(false);}

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