The operating system sends the DBT_DEVICEQUERYREMOVE device message to request permission to remove a device. Any application can deny this request and cancel the removal.
To send the DBT_DEVICEQUERYREMOVE device message, the operating system sends the WM_DEVICECHANGE message with wParam set to DBT_DEVICEQUERYREMOVE and lParam set to the address of a DEV_BROADCAST_HDR structure identifying the device to remove.
dwData = (DWORD) lParam;
Return TRUE to grant permission to remove a device.
Return BROADCAST_QUERY_DENY to deny permission to remove a device.
DEV_BROADCAST_HDR, WM_DEVICECHANGE
file: /Techref/os/win/api/win32/mess/src/msg03_22.htm, 1KB, , updated: 2000/4/7 11:19, local time: 2024/11/6 19:43,
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