opencv打开摄像头

    #include <cv.h>

    #include <cxcore.h>

    #include <highgui.h>

    int main( int argc, char** argv )

    {

      //声明IplImage指针

      IplImage* pFrame = NULL;

     //获取摄像头

      CvCapture* pCapture = cvCreateCameraCapture(-1);

      //创建窗口

      cvNamedWindow("video", 1);

      //显示视屏

      while(1)

      {

          pFrame=cvQueryFrame( pCapture );

          if(!pFrame)break;

          cvShowImage("video",pFrame);

          char c=cvWaitKey(33);

          if(c==27)break;

      }

      cvReleaseCapture(&pCapture);

      cvDestroyWindow("video");

    }