Wei,
sorry for the late response.

i checked my 0byte files carefully and i found out that most of them are
redirects to https. my current libcurl build (windows) has no ssl support,
so thats the problem.
one url keeps me wondering:
http://www.youtube.com/?hl=en&tab=n1
when i use this one with your function i get a:
HTTP/1.1 400 Bad Request
but why? in firefox the redirect is working fine...

--
Jan
2008/10/8 Wei Weng <wweng_at_acedsl.com>
> Jan wrote:
> > Wei,
> >
> > like i wrote in the beginning of my post:
> > http://mail.google.com/mail/?hl=nl&tab=nm <?hl=nl&tab=nm>
> > http://www.google.com/calendar/render?hl=nl&tab=nc
> > <http://www.google.com/calendar/render?hl=nl&tab=nc>
> >
> > --
> > Jan
> >
> > 2008/10/7 Wei Weng <wweng_at_acedsl.com <mailto:wweng_at_acedsl.com>>
> >
> >     mr orgi wrote:
> >     > Hello,
> >     >
> >     > i have some problems using libcurl in my program.
> >     >
> >     > if i run it for example for all sublinks of news.google.com
> >     <http://news.google.com>
> >     > <http://news.google.com> some links are stored as 0byte files.
> >     >
> >     > some examples of these links:
> >     > http://mail.google.com/mail/?hl=nl&tab=nm
> >     <http://mail.google.com/mail/?hl=nl&tab=nm>
> >     > <http://mail.google.com/mail/?hl=nl&tab=nm
> >     <http://mail.google.com/mail/?hl=nl&tab=nm>>
> >     > http://www.google.com/calendar/render?hl=nl&tab=nc
> >     <http://www.google.com/calendar/render?hl=nl&tab=nc>
> >     > <http://www.google.com/calendar/render?hl=nl&tab=nc
> >     <http://www.google.com/calendar/render?hl=nl&tab=nc>>
> >     >
> >     > these are all links which are refered to another link.. i have
> >     read the
> >     > manpages and FOLLOWLOCATION should be the solution for this
> >     problem. but
> >     > for some links it still not works.
> >     >
> >     > my curl options are the following:
> >     >
> >     > CURL *curl;
> >     > curl = curl_easy_init();
> >     > curl_easy_setopt(curl, CURLOPT_URL, link);
> >     > curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
> >     > curl_easy_setopt(curl, CURLOPT_MAXREDIRS, -1);
> >     > curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
> >     > curl_easy_setopt(curl, CURLOPT_WRITEDATA, file);
> >     > curl_easy_perform(curl);
> >     > curl_easy_cleanup(curl);
> >     >
> >     > libcurl version: 7.16.4
> >     > Visual Studio 2008
> >     > libcurl compiled as static Multi Threaded
> >     >
> >     > any suggestions?
> >     >
> >     > thanks in advance,
> >     > Jan
> >
> >     What are the links that it doesn't work for?
> >
> >     Thanks
> >     Wei
> >
> >
>
> Jan,
>
> I wrote a small test program.
>
> #include <stdio.h>
>
> #include <curl/curl.h>
> #include <curl/types.h>
> #include <curl/easy.h>
>
> int main(int argc, char **argv)
> {
>        CURL *curl;
>        CURLcode res;
>        const char* link;
>
>        curl_global_init(CURL_GLOBAL_ALL);
>
>        curl = curl_easy_init();
>        if (curl)
>        {
>                link = "http://www.google.com/calendar/render?hl=nl&tab=nc
> ";
>
>                curl_easy_setopt(curl, CURLOPT_URL, link);
>                curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
>                curl_easy_setopt(curl, CURLOPT_MAXREDIRS, -1);
>                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
>
>                res = curl_easy_perform(curl);
>
>                curl_easy_cleanup(curl);
>
>                fprintf(stderr, "curl told us %d\n", res);
>        }
>
>        curl_global_cleanup();
>
>        return 0;
> }
>
> I can successfully connect to google calendar, in fact, below is part of
> the
> VERBOSE output:
>
> [ 13:20:25 ] wweng /home/wweng $ ./a.out
> * About to connect() to www.google.com port 80 (#0)
> *   Trying 74.125.47.99... * connected
> * Connected to www.google.com (74.125.47.99) port 80 (#0)
> > GET /calendar/render?hl=nl&tab=nc HTTP/1.1
> Host: www.google.com
> Accept: */*
>
> < HTTP/1.1 302 Moved Temporarily
> < Location:
>
> https://www.google.com/accounts/ServiceLogin?service=cl&passive=true&nui=1&continue=http%3A%2F%2Fwww.google.com%2Fcalendar%2Frender%3Fhl%3Dnl%26tab%3Dnc&followup=http%3A%2F%2Fwww.google.com%2Fcalendar%2Frender%3Fhl%3Dnl%26tab%3Dnc&hl=nl
> < Content-Type: text/html; charset=UTF-8
> < Date: Wed, 08 Oct 2008 17:20:40 GMT
> < Expires: Wed, 08 Oct 2008 17:20:40 GMT
> < Cache-Control: private, max-age=0
> < Content-Length: 438
> < Server: GFE/1.3
> <
> * Ignoring the response-body
> * Connection #0 to host www.google.com left intact
> * Issue another request to this URL:
> '
> https://www.google.com/accounts/ServiceLogin?service=cl&passive=true&nui=1&continue=http%3A%2F%2Fwww.google.com%2Fcalendar%2Frender%3Fhl%3Dnl%26tab%3Dnc&followup=http%3A%2F%2Fwww.google.com%2Fcalendar%2Frender%3Fhl%3Dnl%26tab%3Dnc&hl=nl
> '
> * About to connect() to www.google.com port 443 (#1)
> *   Trying 209.85.165.103... * connected
> * Connected to www.google.com (209.85.165.103) port 443 (#1)
> * successfully set certificate verify locations:
> *   CAfile: /etc/ssl/certs/ca-certificates.crt
>  CApath: none
>
> Notice the "< HTTP/1.1 302 Moved Temporarily" line?
>
> So what exactly didn't work for you?
>
> Thanks
> Wei
>
>
>