OpenCV WebCam

1.hardware environment:NaroPiM1 development board,WebCam-OV2659
2.software environment:debian opencv
3.steps:
a.vi a.c
b.input codes as follows:

#include "cv.h"  
#include "cxcore.h"  
#include "highgui.h"  
#include <iostream>  

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('X', 'V', 'I', 'D'), 25,  
       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  
        int i = 0;  
      // while(i <= 200) // 让它循环200次自动停止录取
        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  
           i++;  
          if(cvWaitKey(2)>0)   
             break; //有其他键盘响应，则退出  
       }  

       cvReleaseVideoWriter(&video);  
       cvReleaseCapture(&capture);  
       cvDestroyWindow("Camera Video");  
    }  
    return 0;  
 }

c.compile instruct:g++ opencv_test.c pkg-config opencv --libs --cflags opencv
d.run instruct:./a.out
notes:”“”should be added to compile instruct “pkg-config opencv –libs –cflags opencv”