cpp time solutions

time_fix.cpp

#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <string>
#include <sstream>
#include <iostream>
#include <time.h>
#include <ctime>
#include <vector>
#include <fstream>
#include <iomanip>


std::vector<std::string> lines;

int epoch_from_string(std::string time_str)
{
    int epoch = 0;
    std::tm t = {};
    std::istringstream ss(time_str);

    if (ss >> std::get_time(&t, "%d/%m/%Y %H:%M")) {
        std::put_time(&t, "%c");
        std::stringstream buffer;
        buffer << std::mktime(&t);
        epoch = stoi( buffer.str() );
    } else {
        std::cout << "Parse failed" << std::endl;
    }
    return epoch;
}

void load_csv_file(){

    std::string filepath = "C://2020/recent_bloodsugar.csv";

    std::ifstream file (filepath);
    std::string header_names;
    getline(file, header_names);

    std::string s;
    while (getline(file, s))
        lines.push_back(s);

    file.close();
};

int main(int argc, char* args[])
{
    
    load_csv_file();
    for (auto s: lines){
        std::string strrepr = s.substr(0, 16); //"24/12/2020 17:30";
        int epoch = epoch_from_string(strrepr);
        std::cout << epoch << std::endl;
    }

    while(true){}
    return 0;
}

I spent a large portion of today fighting the C++ timelord. it now yields useful results