C/C++中用libcurl进行http请求，向ES中插入数据

#include <stdio.h>
#include <curl/curl.h>

int Insert(long arg1, long arg2, long arg3, long arg4, const char* arg5)
{
    CURL *curl;
    CURLcode res;
    //const char* str = "{\"time\":\"1542852001\",\"total\":\"100\",\"in\":\"20\",\"out\":\"80\",\"interface\":\"eth0\"}";
    char str[100];
    char url[100] = "http://192.168.1.200:9200/index/type/";

    sprintf(str, "{\"time\":%ld,\"total\":%ld,\"in\":%ld,\"out\":%ld,\"interface\":\"%s\"}", arg1, arg2, arg3, arg4, arg5);
    
    curl_global_init(CURL_GLOBAL_ALL);
    curl = curl_easy_init();
    if(curl!=NULL)
    {
        curl_easy_setopt(curl, CURLOPT_URL, url);
        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, str);
        res = curl_easy_perform(curl);
        if(res != CURLE_OK)
            //fprintf(stderr, "curl_easy_perform() failed: %s\n", curl_easy_strerror(res));
            ErrPrintf("bandwidth error");
        curl_easy_cleanup(curl);
    }
    
    curl_global_cleanup();
    
    return 0;
}