程序采用 opencv 接口获取笔记本摄像头，固需提前配置好 opencv 环境。
效果如下：
#include "cv.h"
#include "highgui.h"
#include "windows.h"
using namespace std;
int main(int argc, char** argv) {
int f = 0, t = 0,n=0,c=0;
cvNamedWindow("WebCam");
CvCapture* capture = cvCreateCameraCapture(0); //创建并获取摄像设备
IplImage* frame;
IplImage* frame1;
frame = cvQueryFrame(capture); //创建并获取一张摄像截图
frame1 = frame;
while (1) {
frame = cvQueryFrame(capture); //创建并获取一张摄像截图
if (!frame)
{
cvReleaseCapture(&capture); //释放摄像设备
CvCapture* capture = cvCreateCameraCapture(0); //创建并获取摄像设备
frame = cvQueryFrame(capture); //创建并获取一张摄像截图
if (!frame)
{
f = f + 1;
cout << "对不起，获取摄像头失败..." << endl;
}
else
{
c = c + 1;
cout << "恭喜，重新获取摄像头成功..." << endl;
cvShowImage("WebCam", frame);
}
}
else
{
t = t + 1;
cout << "恭喜，获取摄像头成功..." << endl;
cvShowImage("WebCam", frame);
}
cvShowImage("WebCam", frame);
n = n + 1;
cout << "----刷新 " << n << " 次----成功 " << t << " 次----重连成功 " << c << " 次----失败 " << f << " 次----" << endl;
char c = cvWaitKey(50);
if (c == 27) break;
}
cvReleaseCapture(&capture); //释放摄像设备
cvDestroyWindow("WebCam"); //释放窗口
return 0;
}
