# SDL_PenID

SDL pen instance IDs.

## Header File

Defined in [<SDL3/SDL_pen.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_pen.h)

## Syntax

```c
typedef Uint32 SDL_PenID;
```

## Remarks

Zero is used to signify an invalid/null device.

These show up in pen events when SDL sees input from them. They remain
consistent as long as SDL can recognize a tool to be the same pen; but if a
pen physically leaves the area and returns, it might get a new ID.

## Version

This datatype is available since SDL 3.2.0.

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[CategoryAPI](CategoryAPI), [CategoryAPIDatatype](CategoryAPIDatatype), [CategoryPen](CategoryPen)