= SDL_hid_send_feature_report =

Send a Feature report to the device.

== Syntax ==

<syntaxhighlight lang='c'>
int SDL_hid_send_feature_report(SDL_hid_device *dev, const unsigned char *data, size_t length);
</syntaxhighlight>

== Function Parameters ==

{|
|'''dev'''
|A device handle returned from [[SDL_hid_open]]().
|-
|'''data'''
|The data to send, including the report number as the first byte.
|-
|'''length'''
|The length in bytes of the data to send, including the report number.
|}

== Return Value ==

Returns the actual number of bytes written and -1 on error.

== Remarks ==

Feature reports are sent over the Control endpoint as a Set_Report
transfer. The first byte of <code>data</code> must contain the Report ID.
For devices which only support a single report, this must be set to 0x0.
The remaining bytes contain the report data. Since the Report ID is
mandatory, calls to [[SDL_hid_send_feature_report]]() will always contain
one more byte than the report contains. For example, if a hid report is 16
bytes long, 17 bytes must be passed to [[SDL_hid_send_feature_report]]():
the Report ID (or 0x0, for devices which do not use numbered reports),
followed by the report data (16 bytes). In this example, the length passed
in would be 17.

== Version ==

This function is available since SDL 2.0.18.

----
[[CategoryAPI]]