#include <stdio.h>

 #include <curl/curl.h>

 #include <stdlib.h>

 #include <string.h>

 struct MemoryStruct {

     char* memory;

     size_t allsize;

 };

 static size_t WriteMemoryCallback(void* contents, size_t _size, size_t nmemb, void* userp)

 {

     size_t realsize = _size * nmemb;

     struct MemoryStruct *mem = (struct MemoryStruct*)userp;

     mem->memory = (char*)realloc(mem->memory, mem->allsize + realsize + );

     if(mem->memory == NULL){

         printf("realloc error...\n");

         return ;

     }

     memcpy(&(mem->memory[mem->allsize]), contents, realsize);

     mem->allsize += realsize;

     mem->memory[mem->allsize] = ;

     return realsize;

 }

 size_t write_data(char* buffer, size_t size, size_t items, void* outstream)

 {

     int written = fwrite(buffer, size, items, (FILE*)(outstream));

     return written;

 }

 double get_download_size(char* url){

     CURL* curl;

     CURLcode res;

     double size = 0.0;

     int httpcode=;

     FILE* fd = fopen("./aaa.txt", "wb+");

     char *type = (char*)malloc();

     struct MemoryStruct chunk;

     chunk.memory = (char*)malloc();

     chunk.allsize = ;

     curl = curl_easy_init();

     curl_easy_setopt(curl, CURLOPT_URL, url);

     //curl_easy_setopt(curl, CURLOPT_NOBODY, 1L);

     curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, );    //不跳转

     curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT_MS, );

     curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*)fd);

     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);

     curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, WriteMemoryCallback);

     curl_easy_setopt(curl, CURLOPT_HEADERDATA, (void*)&chunk);

     res = curl_easy_perform(curl);

     if(res != CURLE_OK){

         fprintf(stderr, "curl_easy_getinfo() failed: %s\n", curl_easy_strerror(res));

     }

     res = curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &httpcode);

     if(res != CURLE_OK || httpcode !=  ){

         fprintf(stdout, "httpcode error!\n");

     }

     res = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &size);

     if(res != CURLE_OK ){

         fprintf(stdout, "httpcode xxxerror!\n");

     }

     res = curl_easy_getinfo(curl, CURLINFO_CONTENT_TYPE, &type);

     if(res != CURLE_OK ){

         fprintf(stdout, "TYPE xxxerror!\n");

     }

     printf("type:\n%s\n", type);

     printf("header:\n%s\n", chunk.memory);

     fclose(fd);

     free(chunk.memory);

     curl_easy_cleanup(curl);

     return size;

 }

 int main(int argc, char* argv[])

 {

     char url[] = "http://www.fastcgi.com/dist/fcgi.tar.gz";

     double filesize = get_download_size(url);

     printf("[%0.0lf] %s\n", filesize, url);

     return ;

 }