Dear Daniel Stenberg:

          Thank you for analysis,^_^, I will try to get the error information to figure out
why fails.
      For wifi+dhcp,because sometime it disconnect even we use PC through router,then we
need to reconnect. So I think may be this is problem.
      Anyway,I will first get more information and thanks for your help. :-)

======= 2007-10-30 17:08:45 Write£º=======

>On Tue, 30 Oct 2007, Aaron shi wrote:
>
>> 1) Possible reason of transfer stop?
>
>libcurl returns error codes and error messages that help pinpoint the reason
>to failures.
>
>> I am working on the mips embedded system which using libcurl to transfer
>> photo data with server(http protocol).
>>
>> Because I want to know the progress of transfer,so I use progress_callback
>> as follow:
>>
>> Sometime I found the progress stopped,like 10% ..., it always be that
>> percentage. I know that is becase no reponse data form server. May be the
>> physical network is disconnect.
>
>If the transfer stops before it is completed, it stopped because the TCP layer
>report and error back to libcurl and then it stopped. I believe you are the
>one here to identify what possible reasons there might be in your case.
>
>> My platform using WIFI and DHCP to connnect with network. I search the web
>> and see somebody say it's unstable of wifi dhcp connection.
>
>What "it's" are you talking about? I can tell you with 100% certainty that
>libcurl is indeed not unstable with wifi + dhcp in any combination, nor does
>it even know nor care that wifi or dhcp is in use.
>
>> Is there another possible reason?
>
>There are probably thousands of possible reasons, and while of course there
>might be a libcurl bug I consider that one of the less likely reasons for you
>and the likelyhood of a bad network, bad hardware, bad server or similar much
>more likely.
>
>> 2)How to solve this problem?
>
>1. Figure out why fails
>2. Fix the failures
>3. Smile!
>
>Of course analyzing the network in detail when the problem appears is one of
>the first things you should do to understand this better.
>
>> I don't know how to handle this prolbem, the curl wait there for the server
>> continuing response data...
>
>If it just waits for data I would say in indicates that there's no data
>coming...
>
>> I try to use timeout option to solve this problem:
>>
>> long curl_timeout = GALLERY_CURL_TIMOUT_MINUTE*15;
>> res = curl_easy_setopt(curl, CURLOPT_TIMEOUT,curl_timeout);
>
>That's not a solution, that's a work-around that prevents the operation from
>taking more than 15 minutes.
>
>> For some reason I disable the SIGNAL using:
>> res = curl_easy_setopt(curl, CURLOPT_NOSIGNAL,1);
>
>That "for some reason" is documented.
>
>--
> Commercial curl and libcurl Technical Support: http://haxx.se/curl.html

= = = = = = = = = = = = = = = = = = = =
                        
BR
¡¡¡¡¡¡¡¡¡¡¡¡
Aaron shi
shiyou_at_nextbase.cn
2007-10-30
Received on 2007-10-30