opencv:打开摄像头

#include "highgui.h"int main(int argc,char** argv){    cvNamedWindow("Example7",1);    CvCapture* capture = cvCreateCameraCapture(-1);    IplImage* frame;    while(1)    {         frame = cvQueryFrame(capture);         if (!frame)         {             break;         }         cvShowImage("Example7",frame);         char c = cvWaitKey(10);         if (c == 27)        {            break;        }    }    cvReleaseCapture(&capture);    cvDestroyWindow("Example7");}