DragonFly On-Line Manual Pages
CURLOPT_WRITEDATA(3) curl_easy_setopt options CURLOPT_WRITEDATA(3)
CURLOPT_WRITEDATA - custom pointer passed to the write callback
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_WRITEDATA, void
A data pointer to pass to the write callback. If you use the
CURLOPT_WRITEFUNCTION(3) option, this is the pointer you'll get in that
callback's 4th argument. If you don't use a write callback, you must
make pointer a 'FILE *' (cast to 'void *') as libcurl will pass this to
fwrite(3) when writing data.
The internal CURLOPT_WRITEFUNCTION(3) will write the data to the FILE *
given with this option, or to stdout if this option hasn't been set.
If you're using libcurl as a win32 DLL, you MUST use a
CURLOPT_WRITEFUNCTION(3) if you set this option or you will experience
By default, this is a FILE * to stdout.
Used for all protocols.
A common technique is to use the write callback to store the incoming
data into a dynamically growing allocated buffer, and then this
CURLOPT_WRITEDATA(3) is used to point to a struct or the buffer to
store data in. Like in the getinmemory example:
Available in all libcurl versions. This option was formerly known as
CURLOPT_FILE, the name CURLOPT_WRITEDATA(3) was introduced in 7.9.7.
This will return CURLE_OK.
libcurl 7.73.0 March 23, 2020 CURLOPT_WRITEDATA(3)