# fsEventsHEventCall<no value>
The **fsEventsHEventCall** function can be used to call an H event. Note that all parameters are converted to strings before being sent, therefor ensure that complex data has been correctly formatted before sending.

 

##### Syntax

``` wasm
FsEventsError fsEventsHEventCall(
    FsHEventId id,
    FsVarParamArray param
);
```

 

##### Parameters

{{< table-wrapper >}}

| Parameters | Description                                                                                                                       |
|------------|-----------------------------------------------------------------------------------------------------------------------------------|
| `eventId`  | The ID of the H event, as returned by the `fsEventsRegisterHEvent` function.                                                      |
| `param`    | The array of parameters that must be sent to the H event. Array's values can be `Integer`, `String`, `CRC`, `Double`, or `Vec3d`. |

{{< /table-wrapper >}}


 

##### Return Values

The function will return an `FsEventsError` code, or `FS_EVENTS_ERROR_NONE` if it succeeded.

 

##### Example

In this example, one of the VCockpits made using JavaScript will listen for an H Event: `H:MyHEvent`. On the WebAssembly side, `FsHEventId myHEvent` has been registered with `fsEventsRegisterHEvent`. , and the event requires a Vec3d as an argument. This means you can call this H Event with the following:

``` wasm
Vec3d v {1, 2, 3};
FsVarParamVariant param;
param.type = FsVarParamTypeVec3d;
param.vec3dValue = v;
FsVarParamArray paramArray;
paramArray.size = 1;
paramArray.array = &param;
 
FsEventsError errorCode = fsEventsHEventCall(myHEvent, paramArray);
if (errorCode != FS_EVENTS_ERROR_NONE)
{
    fprintf(stderr, "An error occurs when calling myHEvent: %d", errorCode);
}
```

Now, in all JavaScript VCockpit, the callback `OnInteractionEvent` will be called with `["MyHEvent", "[1.00, 2.00, 3.00]"]`:

``` js
onInteractionEvent(evt) {
    if (evt[0] == "MyHEvent") {
        // MyHEvent has been received
        // params are in evt[1]
    }
}
```