【探索OpenCV】OpenCV读取视频文件

    CString Filepath;
    CFileDialog dlg(TRUE);
    if(dlg.DoModal()==IDOK)
    {
        Filepath=dlg.GetPathName();
    }
    char *path;
    path=Filepath.GetBuffer(Filepath.GetLength());
    CvCapture *cap;
    IplImage *frame;
    const char ESC = 27;
    cvNamedWindow("Camera",CV_WINDOW_AUTOSIZE);
     if (cap = cvCreateFileCapture(path))
     {
         while ((frame = cvQueryFrame(cap)) != 0 &&
             cvWaitKey(20) != ESC)
         {
            frame = cvQueryFrame(cap);
            cvShowImage("Camera", frame);
        }
        cvReleaseCapture(&cap);
        /* cvReleaseImage(&frame); 
         * 注意，这里不能释放，释放会出错
         */
        cvDestroyWindow("Camera");
    }