opencv实现定时录像功能

  #include "cv.h"    #include "cxcore.h"    #include "highgui.h"    #include <iostream>    #include <time.h>   #include <Windows.h>   #include <Mmsystem.h>   #include "stdio.h"    int timea=100000;    using namespace std;  /*void times() {   SYSTEMTIME sys_time;    //将变量值设置为本地时间   GetLocalTime( &sys_time );    //输出时间   printf( "%4d/%02d/%02d %02d:%02d:%02d.%03d 星期%1d/n",sys_time.wYear,     sys_time.wMonth,     sys_time.wDay,     sys_time.wHour,     sys_time.wMinute,     sys_time.wSecond,     sys_time.wMilliseconds,     sys_time.wDayOfWeek);   // system("time");   //  // system("pause");   return 0;   } */   int main()    {      CvCapture* capture=cvCaptureFromCAM(0);      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      int c=0;     SYSTEMTIME sys_time;    //将变量值设置为本地时间     GetLocalTime( &sys_time );     char buf[1024];     sprintf(buf,"camera-%4d-%2d-%02d-%02d-%02d-%02d.avi",sys_time.wYear,sys_time.wMonth,sys_time.wDay,     sys_time.wHour,sys_time.wMinute, sys_time.wSecond);         video=cvCreateVideoWriter(buf, 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;       }     cout<<"set the record time/n"<<endl;//设置录像时间    cin>>timea;    int ti=timea*25;              cvNamedWindow("Camera Video",1); //新建一个窗口        int i = 0;       while(i <= ti) // 让它循环ti次自动停止录取        {         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); //如果不释放则春不上      cvReleaseCapture(&capture);       cvDestroyWindow("Camera Video");      }      return 0;    }