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);
}

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。

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