cURL 노트 의 3 디 스 플레이 진도

/*
 * =====================================================================================
 *       Filename:  save_url.c
 *    Description:    url     
 *
 *        Version:  1.0
 *        Created:  07/14/2012 12:28:43 PM
 *
 *         Author:  zhy (), [email protected]
 * =====================================================================================
 */

#include <stdio.h>

#include <curl/curl.h>

//            ：
//size_t function(char* ptr, size_t size, size_t nmemb, void *userdata);
//usedata    CURLOPT_WRITEDATA  
//         ，       (FILE*)
size_t writeData(char* ptr, size_t size, size_t nmemb, void* stream)
{
    int written = fwrite(ptr, size, nmemb, (FILE *)(stream));
    return written;
}

/*            ：
 * int function(void* clientp, double dltotal, double dlnow, double ultotal, double ulnow)
 * clientp    CURLOPT_PROGRESSDATA  
 *             ，      */
int progress(void* clientp, double dltotal, double dlnow, double ultotal, double ulnow)
{
    printf("------ %.2f%% ------
", dlnow/dltotal);
    return 0;
}

int main()
{
    CURL* curl;
    CURLcode res;

    /*    ，  CURL* */
    curl = curl_easy_init();
    /*   URL */
    curl_easy_setopt(curl, CURLOPT_URL, "http://www.baidu.com");
    /*         */
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeData);

    FILE* fp = fopen("baidu_curl.html", "w");
    if (fp == NULL)
    {
        curl_easy_cleanup(curl);
        return -1;
    }

    /*       userdata*/
    /*         ，    FILE* */
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
    /*     0   */
    curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
    /*              */
    curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress);
    res = curl_easy_perform(curl);

    if (res != CURLE_OK)
        fprintf(stderr, "curl_easy_perform() failed: %s
",
                /*  CURLcode               */
                curl_easy_strerror(res));

    /*       */
    fclose(fp);
    /*    ，       , curl_easy_init    */
    curl_easy_cleanup(curl);

    return 0;
}