标签c ++ libcurl json rest

std::string ServerContent::DownloadJSON(std::string URL){       CURL *curl;    CURLpre res;    struct curl_slist *headers=NULL; // init to NULL is important     std::ostringstream oss;    headers = curl_slist_append(headers, "Accept: application/json");      headers = curl_slist_append(headers, "Content-Type: application/json");    headers = curl_slist_append(headers, "charset: utf-8");     curl = curl_easy_init();    if (curl)     {        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);        curl_easy_setopt(curl, CURLOPT_URL, URL.c_str());        curl_easy_setopt(curl, CURLOPT_HTTPGET,1);         curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION,writer);        res = curl_easy_perform(curl);        if (CURLE_OK == res)         {  char *ct;          res = curl_easy_getinfo(curl, CURLINFO_CONTENT_TYPE, &ct); if((CURLE_OK == res) && ct)     return *DownloadedResponse;        }    }    curl_slist_free_all(headers);}static std::string *DownloadedResponse;static int writer(char *data, size_t size, size_t nmemb, std::string *buffer_in){    // Is there anything in the buffer?      if (buffer_in != NULL)      {        // Append the data to the buffer buffer_in->append(data, size * nmemb);        // How much did we write?DownloadedResponse = buffer_in;        return size * nmemb;      }    return 0;}