php - Using libcurl in c++, writing into file -

i started using curl. far have managed program response , save file/string. using response apis , process them. i'd using market interpretation test various trading systems. purpose plan save responses tempfile, process file , save a-ready-to-use data one. however, no matter string or file, output one-line type.

i wondering if there way make curl directly write in file, 'sorted' in lines. mean if there response like:

4stmay2017 - gold - open price: 1150, close price:1200  3stmay2017 - gold - open price: 1060, close price:1170  2stmay2017 - gold - open price: 1100, close price:1050  1stmay2017 - gold - open price: 1000, close price:1100 

that's way i'd file like, can sort new data (because market dynamic, , requests i'd make every minute or so), , not on 1 line. way have write write separate algorithm slow me down.

what code looks like:

#include <iostream> #include <stdlib.h> #include <stdio.h> #include <curl/curl.h> #include <string>  using namespace std; size_t size = 0;  size_t write_to_string(void *ptr, size_t size, size_t count, void *stream) {     ((string*)stream)->append((char*)ptr, 0, size*count);     return size*count; } int main() {     curl *curl;     curlcode res;     curl_global_init(curl_global_all);     curl = curl_easy_init();     if (curl){         string out = string("someurl");         curl_easy_setopt(curl, curlopt_url, out.c_str());         string response;         curl_easy_setopt(curl, curlopt_ssl_verifypeer, false);         curl_easy_setopt(curl, curlopt_writefunction, write_to_string);         curl_easy_setopt(curl, curlopt_writedata, &response);         res = curl_easy_perform(curl);         if (res != curle_ok)             fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));         curl_easy_cleanup(curl);     }     curl_global_cleanup();     return 0; }