Qt 多线程

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qt中多线程使用示例：

.h文件:#ifndef CTHREAD_H#define CTHREAD_H#include <QThread>#include <QImage>class CThread : public QThread{    Q_OBJECTpublic:    CThread();    void setMessage(QString message);    void stop();    void SetImage(const QImage& img);    QImage& GetShowImage();protected:    void run();     void printMessage();    void CreateShowImage();private:    QString messageStr;    QImage m_image;    QImage m_showImage;    volatile bool stopped;};#endif // CTHREAD_H

.cpp文件：

#include "CThread.h"#include <QDebug>#include <QPainter>CThread::CThread(){     stopped = false;}void CThread::run(){    while(!stopped)   {        CreateShowImage();    }    stopped = false;}void CThread::stop(){    stopped = true;}void CThread::setMessage(QString message){    messageStr = message;}void CThread::printMessage(){    qDebug()<<messageStr;    sleep(1);}QImage& CThread::GetShowImage(){    return m_showImage;}void CThread::SetImage( const QImage& img ){    m_image = img;}void CThread::CreateShowImage(){    int nWidth = m_image.width();    int nHeight = m_image.height();    if (nWidth <=0||nHeight<=0)    {        //stopped = true;        return;    }    m_showImage = QImage(3*nWidth,3*nHeight,QImage::Format_ARGB32);    QPainter painter(&m_showImage);    QPixmap pixmap;    pixmap.convertFromImage(m_image);    for (int i=0;i<3;++i)    {        painter.drawPixmap(0+i*nWidth,0,pixmap);        painter.drawPixmap(0+i*nWidth,nHeight,pixmap);        painter.drawPixmap(0+i*nWidth,2*nHeight,pixmap);    }    //stopped = true;}

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