DBT_USERDEFINED event
The DBT_USERDEFINED device event identifies a user-defined event.
To broadcast this device event, call the BroadcastSystemMessage function with the WM_DEVICECHANGE message. Set wParam to DBT_USERDEFINED and set lParam as described following.
LRESULT CALLBACK WindowProc( HWND hwnd, // handle to window
UINT uMsg, // WM_DEVICECHANGE
WPARAM wParam, // DBT_USERDEFINED
LPARAM lParam ); // event-specific data
Parameters
-
hwnd
-
A handle to a window.
-
uMsg
-
The WM_DEVICECHANGE message identifier.
-
wParam
-
Set to DBT_USERDEFINED.
-
lParam
-
A pointer to a _DEV_BROADCAST_USERDEFINED structure which describes the user-defined broadcast in progress. The dbud_szName member contains the name of the user-defined message, followed by any user-defined data.
Return value
Return TRUE.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows XP |
| Minimum supported server |
Windows Server 2003 |
| Header |
|