libcur post文件到Web服务器异步不起作用？

Question

我想通过http post将文件上传到IIS或Apache等Web服务器。 该文件大于1GB，所以我想异步上传它。 但代码无法工作，从未执行过。回调“readfunc”函数？ 有什么不对或我该怎么办？ 非常感谢！

size_t readfunc(void *ptr, size_t size, size_t nmemb, void *stream)
{
    FILE *f = (FILE *)stream;
    size_t n;

    if (ferror(f))
        return CURL_READFUNC_ABORT;

    n = fread(ptr, size, nmemb, f) * size;

    return n;
}

void curl_post_form()
{
    curl_global_init(CURL_GLOBAL_ALL);
    CURL* hCurl = curl_easy_init();
    if (hCurl != NULL)
    {
        curl_httppost* pFormPost = NULL;
        curl_httppost* pLastElem = NULL;

        curl_formadd(&pFormPost, &pLastElem, 
            CURLFORM_COPYNAME, "ufile01", 
            CURLFORM_FILE, "D:\\123.iso", 
            CURLFORM_CONTENTTYPE, "application/octet-stream", 
            CURLFORM_END);

        curl_easy_setopt(hCurl, CURLOPT_HTTPPOST, pFormPost);
        curl_easy_setopt(hCurl, CURLOPT_URL,"http://192.168.138.1:8800/Record/");                         
        /* I want to use my own read function */
        curl_easy_setopt(curlhandle, CURLOPT_READFUNCTION, readfunc);
        /* now specify which file to upload */
        curl_easy_setopt(curlhandle, CURLOPT_READDATA, f);

        curl_easy_setopt(hCurl, CURLOPT_VERBOSE, 1L);
        CURLcode res = curl_easy_perform(hCurl);
        if (res != CURLE_OK)
        {
            printf("Error");
        }
        curl_formfree(pFormPost);
        curl_easy_cleanup(hCurl);
    }

    curl_global_cleanup();
}