# fsEventsRegisterKeyEventHandler<no value>
The **fsEventsRegisterKeyEventHandler** function can be used to register a Key Event handler which will receive all Key Events raised by the simulation.

 

##### Syntax

``` wasm
void fsEventsRegisterKeyEventHandler(
    FsEventsKeyEventHandler handler,
    void* userParam
);
```

 

##### Parameters

{{< table-wrapper >}}

| Parameters  | Description                                                                             |
|-------------|-----------------------------------------------------------------------------------------|
| `handler`   | The callback that will be called each time a Key Event is raised by the simulation.     |
| `userParam` | The pointer on user data that will be sent to the `handler` each time it will be called |

{{< /table-wrapper >}}


 

##### Return Values

The function has no return value.

 

##### Example

``` wasm
void EventHandler(FsEventId id, FsVarParamArray* params, void* userParams)
{
    ...
}
DATA* userData = new DATA();
fsRegisterKeyEventHandler(EventHandler, userData);
```