檔案中載入介面顯示的控制元件，變數都放在了threaddlg.h檔案中.

threaddld.h原始碼如下：

#ifndef THREADDLG_H
#define THREADDLG_H
#include <QDialog>
#include <QPushButton>
#include "workthread.h"
#define MAXSIZE 2
namespace Ui {
class ThreadDlg;
}
class ThreadDlg : public QDialog
{
    Q_OBJECT
public:
    explicit ThreadDlg(QWidget *parent = 0);
    ~ThreadDlg();
private:
    Ui::ThreadDlg *ui;
    QPushButton *startBtn;
    QPushButton *stopBtn;
    QPushButton *quitBtn;
    WorkThread *workThraed[MAXSIZE];
public slots:
   void slotStart();
    void slotStop();
};
#endif // THREADDLG_H
 

#include "threaddlg.h"
#include "ui_threaddlg.h"
#include <QHBoxLayout>
#include <QDebug>
ThreadDlg::ThreadDlg(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::ThreadDlg)
{
    ui->setupUi(this);
    setWindowTitle(tr("執行緒"));
    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()));
}
void ThreadDlg::slotStart()
{
    for(int i=0;i<MAXSIZE;i++)
    {
        workThraed[i]=new WorkThread();
    }
    for(int i=0;i<MAXSIZE;i++)
    {
        workThraed[i]->start();
    }
    startBtn->setEnabled(false);
    stopBtn->setEnabled(true);
}
void ThreadDlg::slotStop()
{
    for(int i=0;i<MAXSIZE;i++)
    {
        workThraed[i]->terminate();
        workThraed[i]->wait();
   }
    startBtn->setEnabled(true);
    stopBtn->setEnabled(false);
}
ThreadDlg::~ThreadDlg()
{
    delete ui;
}
 

還是一樣先建立一個頭檔案用來放多執行緒任務中需要的變數和方法的，標頭檔案workthread.h的原始碼如下：

#ifndef WORKTHREAD_H
#define WORKTHREAD_H
#include <QThread>
class WorkThread : public QThread
{
    Q_OBJECT
   public:
    WorkThread();
   protected:
     void run();
};
#endif // WORKTHREAD_H

想知道public和protected區別的話可以百度下
 

方法定義好了之後，在cpp檔案中實現方法。workthred.CPP檔案的原始碼如下：

#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;
    }
}