# fsVarsUnregisterVarsStatusUpdateHandler<no value>
The **fsVarsUnregisterVarsStatusUpdateHandler** function can be used to unregister a handler previously registered with `fsVarsRegisterVarsStatusUpdateHandler`.

 

##### Syntax

``` wasm
FsVarError fsVarsUnregisterVarsStatusUpdateHandler(
    FsVarsStatusUpdateHandler handler,
    void* pUserParam,
    bool bUseObjIdSpecialValue
);
```

 

##### Parameters

<table><thead><tr class="header"><th>Parameters</th><th>Description</th></tr></thead><tbody><tr class="odd"><td><code>handler</code></td><td>The pointer to the function that was registered as the handler.</td></tr><tr class="even"><td><code>pUserParam</code></td><td>The pointer to the user parameter that was given when the handler was registered.</td></tr><tr class="odd"><td><code>bUseObjIdSpecialValue</code></td><td><p>Whether the handler used special values for object IDs or not.</p><p>Default: true</p></td></tr></tbody></table>

 

##### Return Values

The function returns `FsVarError`, where 0 means there is no error (in which case the handler will be called each time the simulation needs to notify a change in the variables).

 

##### Example

``` wasm
void handler(FsVarsTypeFlags varsUpdated, FsVarUpdateOp op, FsObjectId objId, void* pUserParam)
{
    // Process variables status update
}
extern "C" MSFS_CALLBACK void module_deinit()
{
    FsVarError err = fsVarsUnregisterVarsStatusUpdateHandler(handler, pUserData, true);
    if (err != FS_VAR_ERROR_NONE)
    {
        // Error
    }
}
```