请教如何在QT自定义线程类中使用QTimer定时器功能

代码贴上

VideoPlayThread.h:

class VideoPlayThread : public QThread{

private:

    QLabel * label_videoPlayer;

    QString fileName;

    CvCapture * g_capture;

    QImage * img;

    IplImage* frame;

public:

    VideoPlayThread();

    void run();

    void setFileName(QString FN);

    void setLabelVideoPlayer(QLabel * labelVP);

private slots:

    void nextFrame();

};

VideoPlayThread.cpp

VideoPlayThread::VideoPlayThread() : QThread()

{

//    timer = new QTimer;

//    connect(timer, SIGNAL(timeout()), this, SLOT(VideoPlayThread::nextFrame()));

}

void VideoPlayThread::setFileName(QString FN)

{

    fileName = FN;

}

void VideoPlayThread::setLabelVideoPlayer(QLabel * labelVP)

{

    label_videoPlayer = labelVP;

}

void VideoPlayThread::nextFrame()

{

    frame = cvQueryFrame(g_capture);

    if(frame)

    {

        cvCvtColor(frame, frame, CV_BGR2RGB);

        img = new QImage((uchar*)frame->imageData, (int)frame->width, (int)frame->height, (int)frame->widthStep, QImage::Format_RGB888);

        *img = img->scaledToWidth(label_videoPlayer->width(), Qt::FastTransformation);

        label_videoPlayer->setPixmap(QPixmap::fromImage(*img));

    }

//    else

//        timer->stop();

}

void VideoPlayThread::run()

{

    g_capture = NULL;

    QByteArray temp = fileName.toLatin1();

    char * FileName = temp.data();

    g_capture = cvCreateFileCapture(FileName);

    int frameNum = (int)cvGetCaptureProperty(g_capture, CV_CAP_PROP_FRAME_COUNT);

    double fps = cvGetCaptureProperty(g_capture, CV_CAP_PROP_FPS);//获取帧率

    double vfps = 1000/fps;//计算每帧的播放时间

    frame = cvQueryFrame(g_capture);

    if(frame)

    {

        cvCvtColor(frame, frame, CV_BGR2RGB);

        img = new QImage((uchar*)frame->imageData, (int)frame->width, (int)frame->height, (int)frame->widthStep, QImage::Format_RGB888);

        *img = img->scaledToWidth(label_videoPlayer->width(), Qt::FastTransformation);

        label_videoPlayer->setPixmap(QPixmap::fromImage(*img));

        QTimer *timer = new QTimer;

        connect(timer, SIGNAL(timeout()), this, SLOT(nextFrame()));

        timer->start(30);

    }

    exec();

    cvReleaseCapture(&g_capture);

}

调试的时候，发现问题好像是connect(timer, SIGNAL(timeout()), this, SLOT(nextFrame()));这一句，提示信息是：No such slot QThread::nextFrame()。

这个我槽函数定义在自定义的线程类VideoPlayThread里了，而且this也显示的是VideoPlayThread*类型，为什么connect函数要去QThread里找槽函数？

还有这一块应该怎么写啊。

小弟叩首求教。