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Code Issues Releases Wiki Activity

CURLOPT_READFUNCTION.3: provide inline example

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... instead of mentioning one in another place
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Daniel Stenberg 2019-08-12 09:20:04 +02:00
parent fb6d46a709
commit f88d865bf4
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1 changed files with 31 additions and 2 deletions
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33
docs/libcurl/opts/CURLOPT_READFUNCTION.3
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@ -69,8 +69,37 @@ The default internal read callback is fread().
.SH PROTOCOLS
This is used for all protocols when doing uploads.
.SH EXAMPLE
Here's an example setting a read callback for reading that to upload to an FTP
site: https://curl.haxx.se/libcurl/c/ftpupload.html
.nf
size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userdata)
{
FILE *readhere = (FILE *)userdata;
curl_off_t nread;
/* copy as much data as possible into the 'ptr' buffer, but no more than
'size' * 'nmemb' bytes! */
size_t retcode = fread(ptr, size, nmemb, readhere);
nread = (curl_off_t)retcode;
fprintf(stderr, "*** We read %" CURL_FORMAT_CURL_OFF_T
" bytes from file\\n", nread);
return retcode;
}
void setup(char *uploadthis)
{
FILE *file = fopen("rb", uploadthis);
CURLcode result;
/* set callback to use */
curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
/* pass in suitable argument to callback */
curl_easy_setopt(curl, CURLOPT_READDATA, uploadthis);
result = curl_easy_perform(curl);
}
.fi
.SH AVAILABILITY
CURL_READFUNC_PAUSE return code was added in 7.18.0 and CURL_READFUNC_ABORT
was added in 7.12.1.