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you could use std::ofstream for saving variables into text file ( needs #include <fstream> )

take a look at the test code below

#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <fstream>

int main( int argc, const char** argv )
{
    // Create the outputfilestream
    std::ofstream output("output_test.txt");

    cv::String s = "OpenCV is a great library for creating Computer Vision software";
    cv::Rect r(10,30,20,20);
    int i = 123;
    float f = (float) 3 / 7;
    cv::Mat m( 5,5,CV_8UC3,cv::Scalar( 0,255,0));

    output << s << std::endl;
    output << r << std::endl;
    output << i << std::endl;
    output << f << std::endl;
    output << m << std::endl;
    output << "this is a Rect : " << r << std::endl;

    return 0;
}

result : output_test.txt

OpenCV is a great library for creating Computer Vision software
[20 x 20 from (10, 30)]
123
0.428571
[0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0;
  0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0;
  0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0;
  0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0;
  0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0]
this is a Rect :[20 x 20 from (10, 30)]

you could use std::ofstream for saving variables into text file ( needs #include <fstream> )

take a look at the test code below

#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <fstream>

int main( int argc, const char** argv )
{
    // Create the outputfilestream
    std::ofstream output("output_test.txt");

    cv::String s = "OpenCV is a great library for creating Computer Vision software";
    cv::Rect r(10,30,20,20);
    int i = 123;
    float f = (float) 3 / 7;
    cv::Mat m( 5,5,CV_8UC3,cv::Scalar( 0,255,0));

    output << s << std::endl;
    output << r << std::endl;
    output << i << std::endl;
    output << f << std::endl;
    output << m << std::endl;
    output << "this is a Rect : " << r << std::endl;
    output.close(); 
    return 0;
}

result : output_test.txt

OpenCV is a great library for creating Computer Vision software
[20 x 20 from (10, 30)]
123
0.428571
[0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0;
  0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0;
  0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0;
  0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0;
  0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0, 0, 255, 0]
this is a Rect :[20 x 20 from (10, 30)]