opencv获取所有摄像头信息

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#include <opencv2/opencv.hpp> #include <iostream> #include <thread>   using namespace cv; using namespace std;   void getCameraInfo(int cameraId) {     VideoCapture cap(cameraId);     if (cap.isOpened()) {         cout << "Camera " << cameraId << " information:" << endl;         cout << " - Width: " << cap.get(CAP_PROP_FRAME_WIDTH) << endl;         cout << " - Height: " << cap.get(CAP_PROP_FRAME_HEIGHT) << endl;         cout << " - FPS: " << cap.get(CAP_PROP_FPS) << endl;         cout << " - FourCC: " << cap.get(CAP_PROP_FOURCC) << endl;         cap.release();     } }   int main() {     // 获取系统上的摄像机数量     int cameraCount = cv::VideoCapture::getNumberOfCameras();       // 创建线程数组，每个线程获取一个摄像机的信息     thread threads[cameraCount];     for (int i = 0; i < cameraCount; i++) {         threads[i] = thread(getCameraInfo, i);     }       // 等待所有线程完成     for (int i = 0; i < cameraCount; i++) {         threads[i].join();     }       return 0; }