curlopt_readdata(3) [mojave man page]

CURLOPT_READDATA(3)					     curl_easy_setopt options					       CURLOPT_READDATA(3)

NAME

       CURLOPT_READDATA - custom pointer passed to the read callback

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_READDATA, void *pointer);

DESCRIPTION

       Data  pointer  to pass to the file read function. If you use the CURLOPT_READFUNCTION(3) option, this is the pointer you'll get as input in
       the 4th argument to the callback.

       If you don't specify a read callback but instead rely on the default internal read function, this data must be  a  valid  readable  FILE  *
       (cast to 'void *').

       If you're using libcurl as a win32 DLL, you MUST use a CURLOPT_READFUNCTION(3) if you set this option.

DEFAULT

       By default, this is a FILE * to stdin.

PROTOCOLS

       This is used for all protocols when sending data.

EXAMPLE

       CURL *curl = curl_easy_init();
       struct MyData this;
       if(curl) {
	 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");

	 /* pass pointer that gets passed in to the
	    CURLOPT_READFUNCTION callback */
	 curl_easy_setopt(curl, CURLOPT_READDATA, &this);

	 curl_easy_perform(curl);
       }

AVAILABILITY

       This option was once known by the older name CURLOPT_INFILE, the name CURLOPT_READDATA(3) was introduced in 7.9.7.

RETURN VALUE

       This will return CURLE_OK.

SEE ALSO

       CURLOPT_READFUNCTION(3), CURLOPT_WRITEDATA(3),

libcurl 7.54.0							   May 01, 2016 					       CURLOPT_READDATA(3)

CURLOPT_WRITEDATA(3)					     curl_easy_setopt options					      CURLOPT_WRITEDATA(3)

NAME

       CURLOPT_WRITEDATA - custom pointer passed to the write callback

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_WRITEDATA, void *pointer);

DESCRIPTION

       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 call-
       back'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 the CURLOPT_WRITEFUNCTION(3) if you set this option or you will experience crashes.

DEFAULT

       By default, this is a FILE * to stdout.

PROTOCOLS

       Used for all protocols.

EXAMPLE

       A common technique is to use the write callback to store the incoming data into a dynamically growing allocated buffer, and then this  CUR-
       LOPT_WRITEDATA(3)   is	used   to   point   to	 a   struct   or   the	buffer	to  store  data  in.  Like  in	the  getinmemory  example:
       https://curl.haxx.se/libcurl/c/getinmemory.html

AVAILABILITY

       Available in all libcurl versions. This option was formerly known as CURLOPT_FILE, the name CURLOPT_WRITEDATA(3) was introduced in 7.9.7.

RETURN VALUE

       This will return CURLE_OK.

SEE ALSO

       CURLOPT_WRITEFUNCTION(3), CURLOPT_READDATA(3),

libcurl 7.54.0							 February 03, 2016					      CURLOPT_WRITEDATA(3)