OpenCV Open Camera 打开摄像头

#include <iostream>
#include <stdio.h>
#include <opencv2/opencv.hpp>

using namespace cv;
using namespace std;

int main(int argc, char *argv[])
{
CvCapture* cam0 = cvCaptureFromCAM(0);
if(!cam0)
{
fprintf(stderr, "Could not initialize opening of Camera 0..\n");
system("Pause");
return -1;
}
printf("cam0 initialized\n");
cvNamedWindow("Camera 0",CV_WINDOW_AUTOSIZE); //create a window called "Camera 0"

while (1)
{
IplImage *cam0Frame = cvQueryFrame(cam0);
if (cam0Frame) {
cvShowImage("Camera 0", cam0Frame);
}
if (cvWaitKey(30) == 27) //wait for 'Esc' key press for 30ms. If 'Esc' key is pressed, break loop
{
cout << "Esc key is pressed by user" << endl;
break;
}
}

cvReleaseCapture(&cam0);
cvDestroyWindow("Camera 0");

return 0;
}