________________________________________
From: [email protected] [[email protected]] on
behalf of Daniel Stenberg [[email protected]]
Sent: Tuesday, January 24, 2012 5:42 PM
To: libcurl development
Subject: RE: libcurl PUT retry and READFUNCTION
On Tue, 24 Jan 2012, Wenjun Chen wrote:
> Please don't top-post.
ok, got it. Thank you very much Daniel, for your help.
>> The libcurl version is 7.21.7. Libcurl returned SUCCESS in this case. And
>> the READFUNCTION only called once and got correct data.
>You forgot the perhaps most important question:
>Did the VERBOSE output show any clues?
My application is linked with libcurl as DLL file, so I don't have verbose
output even though the CURLOPT is set to verbose in code. This happens
intermittent, and it is not easy to reproduce.
>It could hint if this was a SEEKFUNCTION problem or not. BTW, SEEKFUNCTION is
>documented. Is there anything that isn't clear on how it works?
I am not sure if this is a correct usage? I will try this and run for a few
hours to see if the problem is resolved.
// set the put_data_callback function
curl_easy_setopt(curl, CURLOPT_PUT, true);
curl_easy_setopt(curl, CURLOPT_READDATA, &m_data);
curl_easy_setopt(curl, CURLOPT_READFUNCTION, put_data_callback);
curl_easy_setopt(curl, CURLOPT_SEEKDATA, &m_data);
curl_easy_setopt(curl, CURLOPT_SEEKFUNCTION,
seek_data_callback);
curl_easy_perform(curl);
struct put_data_t {
const char * data_start;
unsigned read_pos;
unsigned data_len;
};
int seek_data_callback(void *userp, curl_off_t offset, int origin)
{
if (!userp)
return 0;
put_data_t *userdata = (put_data_t *)userp;
if (offset > userdata->data_len)
return CURL_SEEKFUNC_FAIL;
if (origin == SEEK_SET || origin == SEEK_CUR)
{
userdata->read_pos = offset;
return CURL_SEEKFUNC_OK;
}
if (origin == SEEK_END)
{
userdata->read_pos = userdata->data_len;
return CURL_SEEKFUNC_OK;
}
return CURL_SEEKFUNC_FAIL;
}
Thanks,
wenjun
>--
> / daniel.haxx.se
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