Created
October 4, 2018 09:29
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Example of HTTP get with C curl library
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| /* Get bit-coin exchange rate */ | |
| #include <iostream> | |
| #include <memory> | |
| #include <string> | |
| #include <stdexcept> | |
| #include <curl/curl.h> | |
| using namespace std; | |
| struct Curl_global | |
| { | |
| Curl_global() | |
| { | |
| curl_global_init(CURL_GLOBAL_ALL); | |
| } | |
| ~Curl_global() | |
| { | |
| curl_global_cleanup(); | |
| } | |
| }; | |
| Curl_global global{}; | |
| auto make_curl_easy_handle_wrapper() | |
| { | |
| CURL *curl = curl_easy_init(); | |
| if (!curl) { | |
| throw runtime_error("fail to get curl easy handle"); | |
| } | |
| return unique_ptr<CURL, decltype(&curl_easy_cleanup)>{curl, &curl_easy_cleanup}; | |
| } | |
| size_t write_data(void *buffer, size_t size, size_t nmemb, void *userp) | |
| { | |
| string* str = static_cast<string*>(userp); | |
| char* data = static_cast<char*>(buffer); | |
| *str += data; | |
| return size* nmemb; | |
| } | |
| string http_get(const string& url) | |
| { | |
| string str_res; | |
| auto curl_easy_handle_wrapper = make_curl_easy_handle_wrapper(); | |
| CURL* curl = curl_easy_handle_wrapper.get(); | |
| curl_easy_setopt(curl, CURLOPT_URL, url.c_str()); | |
| curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data); | |
| curl_easy_setopt(curl, CURLOPT_WRITEDATA, str_res); | |
| /* example.com is redirected, so we tell libcurl to follow redirection */ | |
| curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); | |
| /* Perform the request, res will get the return code */ | |
| CURLcode res = curl_easy_perform(curl); | |
| /* Check for errors */ | |
| if(res != CURLE_OK) | |
| fprintf(stderr, "curl_easy_perform() failed: %s\n", | |
| curl_easy_strerror(res)); | |
| return str_res; | |
| } | |
| int main() | |
| { | |
| auto res = http_get("https://blockchain.info/ticker"); | |
| cout <<res<<'\n'; | |
| } |
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