# 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)

## Syntax

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

## Function Parameters

|                                    |            |                                                                       |
| ---------------------------------- | ---------- | --------------------------------------------------------------------- |
| [SDL_hid_device](SDL_hid_device) * | **dev**    | A device handle returned from [SDL_hid_open](SDL_hid_open)().         |
| const unsigned char *              | **data**   | The data to send, including the report number as the first byte.      |
| size_t                             | **length** | The length in bytes of the data to send, including the report number. |

## Return Value

(int) 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.

----
[CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryHIDAPI](CategoryHIDAPI)

