The operating system sends the DBT_CONFIGCHANGECANCELED device message when a request to change the current configuration (dock or undock) has been canceled.
To send the DBT_CONFIGCHANGECANCELED device message, the operating system sends the WM_DEVICECHANGE message with wParam set to DBT_CONFIGCHANGECANCELED and lParam set to zero.
Parameters
lParam
lParam is zero when the WM_DEVICECHANGE message is sent with wParam set to DBT_CONFIGCHANGECANCELED.
Return Values
Return TRUE.
See Also