////  main.cpp//  opencv3////  Created by PKU on 14-9-16.//  Copyright (c) 2014年 PKU. All rights reserved.//#include <opencv2/opencv.hpp>using namespace cv;using namespace std;int main(){    CvCapture* capture=cvCaptureFromCAM(-1);    CvVideoWriter* video=NULL;    IplImage* frame=NULL;    int n;    if(!capture) //如果不能打开摄像头给出警告    {        cout<<"Can not open the camera."<<endl;        return -1;    }    else    {        frame=cvQueryFrame(capture); //首先取得摄像头中的一帧        video=cvCreateVideoWriter("camera.avi",CV_FOURCC(‘M‘, ‘J‘, ‘P‘, ‘G‘),32,                                  cvSize(frame->width,frame->height)); //创建CvVideoWriter对象并分配空间        //保存的文件名为camera.avi，编码要在运行程序时选择，大小就是摄像头视频的大小，帧频率是32        if(video) //如果能创建CvVideoWriter对象则表明成功        {            cout<<"VideoWriter has created."<<endl;        }        cvNamedWindow("Camera Video",1); //新建一个窗口        while(1)        {            frame=cvQueryFrame(capture); //从CvCapture中获得一帧            if(!frame)            {                cout<<"Can not get frame from the capture."<<endl;                break;            }            n=cvWriteFrame(video,frame); //判断是否写入成功，如果返回的是1，表示写入成功            cout<<n<<endl;             cvShowImage("Camera Video",frame); //显示视频内容的图片             if(cvWaitKey(1)>0) break; //有其他键盘响应，则退出         }         cvReleaseVideoWriter(&video);         cvReleaseCapture(&capture);         cvDestroyWindow("Camera Video");     }     return 0; }