[write & read xml file using opencv]

#include <opencv2\core\core.hpp>
#include <opencv2\highgui\highgui.hpp>
#include <iostream>
#include <string>

using namespace cv;
using namespace std;

int main(int ac, char** av)
{
    string filename = av[1];
    {
        Mat  R = Mat_<uchar>::eye(3,3),
            T = Mat_<double>::zeros(3,1);
        int sz[3] = {2,2,2};
        Mat L(3,sz, CV_8UC(1), Scalar::all(0));
        Mat C = (Mat_<double>(3,3) << 0, -1, 0, -1, 5, -1, 0, -1, 0);
        Mat M = imread("image.jpg");

        FileStorage fs(filename, FileStorage::WRITE);
        fs << "iterationNr" << 100;
        fs << "strings" << "[";
        fs << "image1.jpg" << "Awasomeness" << "baboon.jpg";
        fs << "]";

        fs << "Mapping";
        fs << "{" << "One" << 1;
        fs << "Two" << 2 << "}";

        fs << "R" << R;
        fs << "T" << T;
        fs << "C" << C;
        fs << "M" << M;

        fs.release();
        cout << "Write Done." << endl;
    }

    { // read
        cout << endl << "Reading: "  << endl;
        FileStorage fs;
        fs.open(filename, FileStorage::READ);

        int itNr;
        itNr = fs["iterationNr"];
        cout << itNr << endl;

        if( !fs.isOpened() )
        {
            cerr << "Failed to open" << filename << endl;
            return 1;
        }

        FileNode n = fs["strings"];
        if (n.type() != FileNode::SEQ)
        {
            cerr << "strings is not a sequence ! FAIL";
        }
        FileNodeIterator it = n.begin(), it_end = n.end();
        for (;it != it_end;++it)
            cout << (string)*it << endl;

        n = fs["Mapping"];
        cout<< "Two " << (int)(n["Two"]) << "; ";
        cout<< "One " << (int)(n["One"]) << endl << endl;

        Mat M;
        fs["M"] >> M;
        cout << endl << "M =" << M << endl;
    }
    getchar();
    return 0;
}