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

Get the number of trackballs on a joystick.

## Header File

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

## Syntax

```c
int SDL_JoystickNumBalls(SDL_Joystick *joystick);

```

## Function Parameters

|                  |                                                                           |
| ---------------- | ------------------------------------------------------------------------- |
| **joystick**     | an [SDL_Joystick](SDL_Joystick) structure containing joystick information |

## Return Value

Returns the number of trackballs on success or a negative error code on
failure; call [SDL_GetError](SDL_GetError)() for more information.

## Remarks

Joystick trackballs have only relative motion events associated with them
and their state cannot be polled.

Most joysticks do not have trackballs.

## Version

This function is available since SDL 2.0.0.

## See Also

* [SDL_JoystickGetBall](SDL_JoystickGetBall)

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