leaning opencv 3.x 트랙바 예제

#include <opencv2/core.hpp>
#include <opencv2/videoio.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <iostream>
#include <fstream>
 
#include <stdio.h>
#include <3vmw9.hpp>
 
using namespace cv;
using namespace rv2;
using namespace std;
 
int g_slider_position = 0;
int g_run = 1, g_dontest = 0;
VideoCapture g_cap;
 
void onTrackbarSlide(int pos, void*) {
    if (!g_dontest) {
        g_run = 1;
        g_cap.set(CAP_PROP_POS_FRAMES, pos);
    }
 
    g_dontest = 0;
}
 
int main(int argc, char** argv) {
 
    namedWindow("Example2_4", WINDOW_AUTOSIZE);
    g_cap.open(string("C:\\test.mp4"));
    int frames = (int)g_cap.get(CAP_PROP_FRAME_COUNT);
    int tmpw = (int)g_cap.get(CAP_PROP_FRAME_WIDTH);
    int tmph = (int)g_cap.get(CAP_PROP_FRAME_HEIGHT);
 
 
    cout << "Positon" << frames << "frames of dimensions(" << tmpw << "," << tmph << ")," << endl;
 
    createTrackbar("position", "Example2_4", &g_slider_position, frames, onTrackbarSlide);
 
    Mat frame;
    for (;;) {
        if (g_run != 0) {
            g_cap >> frame; if (frame.empty()) break;
            int current_pos = (int)g_cap.get(CAP_PROP_POS_FRAMES);
            g_dontest = 1;
 
 
            setTrackbarPos("Position", "Example2_4", current_pos);
            imshow("Example2_4", frame);
 
            g_run -= 1;
 
        }
 
 
        char c = (char) waitKey(10);
        if (c == 's') {
            g_run = 1; cout << "Single step , run = " << g_run << endl;
        }
        if (c == 'r') {
            g_run = -1; cout << "Run Mode, run = " << g_run << endl;
        }
        if (c == 27) {
            break;
        }
    }
 
 
    return 0;
}