【踩坑记录】curl

c++利用libcurl发送POST请求

#include <curl/curl.h>



static int writer(char* data, size_t size, size_t nmemb, std::string* writer_data)
{ 
    unsigned long sizes = size * nmemb;
    if (NULL == writer_data){  
        return 0;
    }  
    writer_data->append(data, sizes);
    return sizes;
}

std::string getRealUrl(CURL *pCurl, std::string url){
    std::string strJsonData = getJsonData(url);//url转化为json字符串(自定义)
    std::string post_url = "XXXX";//

    CURL *curl = curl_easy_init();
    CURLcode res = curl_global_init(CURL_GLOBAL_ALL);
    curl_slist *pList = NULL;
    pList = curl_slist_append(pList,"Content-Type:application/json");
    curl_easy_setopt(pCurl, CURLOPT_HTTPHEADER, pList);
    curl_easy_setopt(pCurl, CURLOPT_URL, post_url.c_str() );
    curl_easy_setopt(pCurl, CURLOPT_HEADER, 0L);
    curl_easy_setopt(pCurl, CURLOPT_FOLLOWLOCATION, 1L);
    curl_easy_setopt(pCurl, CURLOPT_NOSIGNAL, 1L);
    curl_easy_setopt(pCurl, CURLOPT_WRITEDATA, &result);    
    curl_easy_setopt(pCurl, CURLOPT_POST, 1L);
    curl_easy_setopt(pCurl, CURLOPT_POSTFIELDS, strJsonData.c_str());
    curl_easy_setopt(pCurl, CURLOPT_POSTFIELDSIZE, strJsonData.size());
    res = curl_easy_perform(pCurl);
    int res_code = 0;
    res=curl_easy_getinfo(pCurl, CURLINFO_RESPONSE_CODE, &res_code);

    Json::Reader Reader;
    Json::Value root;
    Reader.parse(result, root);
    result_url = root["resultlist"][0]["url"].toStyledString();

    curl_slist_free_all(pList);
    curl_global_cleanup();
    curl_easy_cleanup(curl);
}