问curl_easy_perform() API崩溃

EN

#include <stdio.h>
#include <curl/curl.h>
#include <QDebug>
#include <string>
int main(void)
{
    CURL *curl;
    FILE *fp;
    CURLcode res;
    curl_global_init(CURL_GLOBAL_ALL);
    std::string url = "https://upload.wikimedia.org/wikipedia/commons/thumb/3/31/Nusfjord_road%2C_2010_09.jpg/1280px-Nusfjord_road%2C_2010_09.jpg";

    //std::string url = "https://ra-jenkins-nyk01.siemens.net/job/TestCase_Logs/ws/OBU_Int_Build/TestCases/TC_30520_OBU_detects_dir_to_increase_whn_conf_increase_dir/TC_30520_OBU_detects_dir_to_increase_whn_conf_increase_dir.ctr";
    char outfilename[FILENAME_MAX] = "D:/ankit.jpg";
    curl = curl_easy_init();
    if (curl)
    {
        fp = fopen(outfilename,"wb");
        curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
        //curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
        //curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, NULL);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
        res = curl_easy_perform(curl);

        if(res == CURLE_OK)
            printf("Download Successful.");
        else
            printf("Not sucessful");

        curl_easy_cleanup(curl);
        fclose(fp);
    }
    return 0;
}