code:final

main.cpp

@@ -40,6 +40,7 @@ download(const string& address) {
     if(curl) {
         CURLcode res;
         curl_easy_setopt(curl, CURLOPT_URL, address);
+        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, input_data);
         curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
         res = curl_easy_perform(curl);
         if(res!=0){