libcurl cookie保存到内存中

    //COOKIELIST
    static string cookieStr = "";
    if(cookieStr.length()>0)   
    {
        curl_easy_setopt(conn, CURLOPT_COOKIELIST, cookieStr.data());
    }
    code = curl_easy_setopt(conn, CURLOPT_COOKIEFILE, "");//启动cookie引擎 
    //code=  curl_easy_setopt(conn, CURLOPT_COOKIEFILE, "cookies.txt");
    //code = curl_easy_setopt(conn, CURLOPT_COOKIEJAR, "cookies.txt");
    
    ......
    ......
    ......
    
    struct curl_slist * cookies;
    code=curl_easy_getinfo(conn, CURLINFO_COOKIELIST, &cookies);
    cookieStr = "";
    if(code== CURLE_OK)
    { 
        struct curl_slist *each = cookies;
        while (each) 
        {
            if (cookieStr.length() > 0)
            {
                cookieStr = cookieStr + "\r\n";
            }
            //printf("cookie:%s\n", each->data);
            cookieStr = cookieStr + each->data;//获取cookie
            each = each->next;
        }
    }
    curl_slist_free_all(cookies);
    curl_easy_cleanup(conn);