The DBT_USERDEFINED device message identifies a user-defined system message.
To send the DBT_USERDEFINED device message, send the WM_DEVICECHANGE message with wParam set to DBT_USERDEFINED and lParam set as described following.
pDbu = (struct _DEV_BROADCAST_USERDEFINED *)lParam;
|file: /Techref/os/win/api/win32/mess/src/msg03_28.htm, 1KB, , updated: 2000/4/7 12:19, local time: 2022/8/7 23:53,
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