我试图在Xcode中运行OpenCV项目，似乎有新的需要为C ++应用程序NSCameraUsageDescription提供info.plist。
2018-09-28 00:03:15.181948+0800 k_nearest_detector_v2[23505:710470] [access] This app has crashed because it attempted to access privacy-sensitive data without a usage description. The app's Info.plist must contain an NSCameraUsageDescription key with a string value explaining to the user how the app uses this data.
Program ended with exit code: 9
我该如何为C ++项目创建.plist文件，因为以前从未需要过它。
我无法从命令行OpenCV程序访问iMac相机。（我正在CodeRunner而不是Xcode下编译和运行程序。）我已经读过Mojave NSCameraUsageDescription在Info.plist中需要的内容，并且我认为我已经将它正确地嵌入了二进制文件中。我在编译标志中添加了-sectcreate __TEXT __info_plist Info.plist（我在这里学到的），当我运行时otool -X -s __TEXT __info_plist videotest | xxd -r（从同一博客文章）它输出：
-?<?xml ve.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
"http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>NSCameraUsageDescription</key>
<string>Uses camera to see vision targets</string>
<key>NSMicrophoneUsageDescription</key>
<string>This app requires to access your microphone in order to access the camera</string>
</dict>
</plist>
（我添加了NSMicrophoneUsageDescription，以防它试图与相机一起打开麦克风。）
这是我运行程序时的输出：
OpenCV version 4.1.0-dev
[ INFO:0] global /Users/steve/Documents/GitHub/ssteve-opencv/modules/videoio/src/videoio_registry.cpp (185) VideoBackendRegistry VIDEOIO: Enabled backends(5, sorted by priority): FFMPEG(1000); GSTREAMER(990); AVFOUNDATION(980); CV_IMAGES(970); CV_MJPEG(960)
[ INFO:0] …我正在尝试打开网络摄像头，并使用OpenCV显示简短的截图。我目前正在使用C ++语言开发Xcode。
代码很简单：
#include <iostream>
#include <opencv2/opencv.hpp>
using namespace std;
using namespace cv;
int main(int argc, const char * argv[]) {
// variable initialization
Mat frame;
VideoCapture cap; // 0 is the webcam
// try to open camera
cap.open(0);
if (!cap.isOpened()) return -1; // check if there is no video or no way to display it
// create a window and display the video capture
namedWindow("Video Capture", CV_WINDOW_AUTOSIZE);
for (int i=0; i<100; i++) {
cap >> frame;
imshow("Video Capture", frame); …