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// main.cpp
#define CURL_STATICLIB
#include <cstdint>
#include <iostream>
#include <memory>
#include <string>
#include "curl.h"
#include "json.h"
namespace
{
std::size_t callback(
const char* in,
std::size_t size,
std::size_t num,
std::string* out)
{
const std::size_t totalBytes(size * num);
out->append(in, totalBytes);
return totalBytes;
}
}
int main()
{
const std::string url("http://date.jsontest.com/");
CURL* curl = curl_easy_init();
// Set remote URL.
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
// Don't bother trying IPv6, which would increase DNS resolution time.
curl_easy_setopt(curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
// Don't wait forever, time out after 10 seconds.
curl_easy_setopt(curl, CURLOPT_TIMEOUT, 10);
// Follow HTTP redirects if necessary.
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
// Response information.
int httpCode(0);
std::unique_ptr<std::string> httpData(new std::string());
// Hook up data handling function.
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, callback);
// Hook up data container (will be passed as the last parameter to the
// callback handling function). Can be any pointer type, since it will
// internally be passed as a void pointer.
curl_easy_setopt(curl, CURLOPT_WRITEDATA, httpData.get());
// Run our HTTP GET command, capture the HTTP response code, and clean up.
curl_easy_perform(curl);
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &httpCode);
curl_easy_cleanup(curl);
if (httpCode == 200)
{
std::cout << "\nGot successful response from " << url << std::endl;
// Response looks good - done using Curl now. Try to parse the results
// and print them out.
Json::Value jsonData;
Json::Reader jsonReader;
if (jsonReader.parse(*httpData, jsonData))
{
std::cout << "Successfully parsed JSON data" << std::endl;
std::cout << "\nJSON data received:" << std::endl;
std::cout << jsonData.toStyledString() << std::endl;
const std::string dateString(jsonData["date"].asString());
const std::size_t unixTimeMs(
jsonData["milliseconds_since_epoch"].asUInt64());
const std::string timeString(jsonData["time"].asString());
std::cout << "Natively parsed:" << std::endl;
std::cout << "\tDate string: " << dateString << std::endl;
std::cout << "\tUnix timeMs: " << unixTimeMs << std::endl;
std::cout << "\tTime string: " << timeString << std::endl;
std::cout << std::endl;
}
else
{
std::cout << "Could not parse HTTP data as JSON" << std::endl;
std::cout << "HTTP data was:\n" << *httpData.get() << std::endl;
return 1;
}
}
else
{
std::cout << "Couldn't GET from " << url << " - exiting" << std::endl;
return 1;
}
return 0;
}
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