# fsEventsUnregisterKeyEventHandler<no value>
The **fsEventsUnregisterKeyEventHandler** function can be used to unregister a Key Event handler that was previously registered.

 

##### Syntax

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

 

##### Parameters

{{< table-wrapper >}}

| Parameters  | Description                                                      |
|-------------|------------------------------------------------------------------|
| `handler`   | The callback that has been previously registered.                |
| `userParam` | The data that has been previously registered with the `handler`. |

{{< /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);
...
fsUnregisterKeyEventHandler(EventHandler, userData);
```