IControlChangeNotify::OnNotify method (devicetopology.h)
The OnNotify method notifies the client when the status of a connector or subunit changes.
Syntax
HRESULT OnNotify(
[in] DWORD dwSenderProcessId,
[in] LPCGUID pguidEventContext
);
Parameters
[in] dwSenderProcessId
The process ID of the client that changed the state of the control. If a notification is generated by a hardware event, this process ID will differ from the client's process ID. For more information, see Remarks.
[in] pguidEventContext
A pointer to the context GUID for the control-change event. The client that initiates the control change supplies this GUID. For more information, see Remarks.
Return value
If the method succeeds, it returns S_OK. If it fails, it returns an error code.
Remarks
A client can use this method to keep track of control changes made by other processes and by the hardware. However, a client that changes a control setting can typically disregard the notification that the control change generates. In its implementation of the OnNotify method, a client can inspect the dwSenderProcessId and pguidEventContext parameters to discover whether it or another client is the source of the control-change event.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows Vista [desktop apps only] |
| Minimum supported server | Windows Server 2008 [desktop apps only] |
| Target Platform | Windows |
| Header | devicetopology.h |