# SimConnect_UnsubscribeFromSystemEvent<no value>
The **SimConnect\_UnsubscribeFromSystemEvent** function is used to request that notifications are no longer received for the specified system event.

 

 

##### Syntax

``` cpp
HRESULT SimConnect_UnsubscribeFromSystemEvent(
    HANDLE  hSimConnect,
    SIMCONNECT_CLIENT_EVENT_ID  EventID
    );
```

 

##### Parameters

{{< table-wrapper >}}

| Parameter     | Description                           | Type    |
|---------------|---------------------------------------|---------|
| *hSimConnect* | Handle to a SimConnect object.        | Integer |
| *EventID*     | Specifies the ID of the client event. | Integer |

{{< /table-wrapper >}}


 

##### Return Values

The function returns an **HRESULT**. Possible values include, but are not limited to, those in the following table.

{{< table-wrapper >}}

| Return value | Description             |
|--------------|-------------------------|
| S\_OK        | The function succeeded. |
| E\_FAIL      | The function failed.    |

{{< /table-wrapper >}}


 

##### Example

``` cpp
static enum EVENT_ID {
    EVENT_FLIGHT_LOAD,
    EVENT_RECUR_1SEC,
    EVENT_RECUR_FRAME, 
    };
hr = SimConnect_SubscribeToSystemEvent(hSimConnect, EVENT_RECUR_1SEC);
hr = SimConnect_UnsubscribeFromSystemEvent(hSimConnect, EVENT_RECUR_1SEC);
```

 

##### Remarks

There is no limit to the number of system events that can be subscribed to, but use this function to improve performance when a system event notification is no longer needed.