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WM_DEVICECHANGE Overview  Group

The WM_DEVICECHANGE device message notifies an application or device driver of a change to the hardware configuration of a device or the computer.

Event = (UINT) wParam;
dwData = (DWORD) lParam;

Parameters

Event
Event type. This parameter can be one of the following values:

Value

Meaning

DBT_CONFIGCHANGECANCELED 

A request to change the current configuration (dock or undock) has been canceled.

DBT_CONFIGCHANGED

The current configuration has changed, due to a dock or undock.

DBT_DEVICEARRIVAL

A device has been inserted and is now available.

DBT_DEVICEQUERYREMOVE

Permission is requested to remove a device. Any application can deny this request and cancel the removal.

DBT_DEVICEQUERYREMOVEFAILED

A request to remove a device has been canceled.

DBT_DEVICEREMOVECOMPLETE

A device has been removed.

DBT_DEVICEREMOVEPENDING

A device is about to be removed. Cannot be denied.

DBT_DEVICETYPESPECIFIC

A device-specific event has occurred.

DBT_QUERYCHANGECONFIG 

Permission is requested to change the current configuration (dock or undock).

DBT_USERDEFINED 

The meaning of this message is user-defined.

dwData
Address of a structure that contains event-specific data. Its meaning depends on the given event.

Return Values

Return TRUE to grant a requested action.

Return BROADCAST_QUERY_DENY to deny a requested action.

Remarks

For devices that offer software-controllable features, such as ejection and locking, the operating system typically sends a DBT_DEVICEREMOVEPENDING message to let applications and device drivers end their use of the device gracefully.

If the operating system forcibly removes a device, it may not send a DBT_DEVICEQUERYREMOVE message before doing so.

DBT_CONFIGCHANGECANCELED, DBT_CONFIGCHANGED, DBT_DEVICEARRIVAL, DBT_DEVICEQUERYREMOVE, DBT_DEVICEQUERYREMOVEFAILED, DBT_DEVICEREMOVECOMPLETE, DBT_DEVICEREMOVEPENDING, DBT_DEVICETYPESPECIFIC, DBT_QUERYCHANGECONFIG, DBT_USERDEFINED

See also:


file: /Techref/os/win/api/win32/mess/src/msg23_17.htm, 4KB, , updated: 2000/4/7 12:20, local time: 2022/5/17 00:50,
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