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i need help to achieve measuring the size of objects using OpenCV.

I got a Link for this functionality, but it was done in Python.I have tried to convert in C++ & Python too but could n't achieve. Honestly i don't know C++ i was tried below code.I am trying to implement this functionality in iOS app.

    - (void)processImage:(cv::Mat &)image; 
    {
    Mat gray;
    cvtColor(image, gray, CV_BGRA2GRAY);
    cv::GaussianBlur(gray, gray, cvSize(7, 7), 0);
    cv::Canny(gray, gray, 50, 100);
    cv::dilate(gray, gray, NULL);
    cv::erode(gray, gray, NULL);
    cv::findContours(gray, contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_NONE);

//sort the contours from left-to-right and initialize the 'pixels per metric' calibration variable
   sort(contours.begin(), contours.end(), [](const vector<cv::Point>& c1, const
vector<cv::Point>& c2){
       return contourArea(c1, false) < contourArea(c2, false);
   });

 for(int i=0; i<contours.size(); i++)
 {
     if (contourArea(contours[i]) < 100) {
         break;
     }
     std::vector<cv::Point2f> boxPts;
     gray.copyTo(orig);
     box = minAreaRect(contours[i]);
     cv::boxPoints(box, boxPts);
  // here i got freeze 'numpy',np i don't know exactly what's this can't move forward
     // box = np.array(box, dtype="int")   
}
   }

Can someone help me to doing this functionality in C++. If anyone other c++ source/link is available for this functionality kindly share with me.Thanks in advance

i need help to achieve measuring the size of objects using OpenCV.

I got a Link for this functionality, but it was done in Python.I have tried to convert in C++ & Python too but could n't achieve. Honestly i don't know C++ & Python too i was tried below code.I am trying to implement this functionality in iOS app.

    - (void)processImage:(cv::Mat &)image; 
    {
    Mat gray;
    cvtColor(image, gray, CV_BGRA2GRAY);
    cv::GaussianBlur(gray, gray, cvSize(7, 7), 0);
    cv::Canny(gray, gray, 50, 100);
    cv::dilate(gray, gray, NULL);
    cv::erode(gray, gray, NULL);
    cv::findContours(gray, contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_NONE);

//sort the contours from left-to-right and initialize the 'pixels per metric' calibration variable
   sort(contours.begin(), contours.end(), [](const vector<cv::Point>& c1, const
vector<cv::Point>& c2){
       return contourArea(c1, false) < contourArea(c2, false);
   });

 for(int i=0; i<contours.size(); i++)
 {
     if (contourArea(contours[i]) < 100) {
         break;
     }
     std::vector<cv::Point2f> boxPts;
     gray.copyTo(orig);
     box = minAreaRect(contours[i]);
     cv::boxPoints(box, boxPts);
  // here i got freeze 'numpy',np i don't know exactly what's this can't move forward
     // box = np.array(box, dtype="int")   
}
   }

Can someone help me to doing this functionality in C++. If anyone other c++ source/link is available for this functionality kindly share with me.Thanks in advance