###### (This is the legacy documentation for stable SDL2, the current stable version; [SDL3](https://wiki.libsdl.org/SDL3/) is the current development version.)
# SDL_hid_send_feature_report

Send a Feature report to the device.

## Header File

Defined in [SDL_hidapi.h](https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_hidapi.h), but apps should _only_ `#include "SDL.h"`!

## Syntax

```c
int SDL_hid_send_feature_report(SDL_hid_device *dev, const unsigned char *data, size_t length);

```

## Function Parameters

|                |                                                                       |
| -------------- | --------------------------------------------------------------------- |
| **dev**        | A device handle returned from [SDL_hid_open](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 `data` 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](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](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.

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[CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction)