The operating system sends the DBT_DEVICEREMOVECOMPLETE device message when a device has been removed.
To send the DBT_DEVICEREMOVECOMPLETE device message, the operating system sends the WM_DEVICECHANGE message with wParam set to DBT_DEVICEREMOVECOMPLETE and lParam set to the address of a DEV_BROADCAST_HDR structure identifying the device removed.
dwData = (DWORD) lParam;
Return TRUE.
The operating system may send a DBT_DEVICEREMOVECOMPLETE message without sending corresponding DBT_DEVICEQUERYREMOVE and DBT_DEVICEREMOVEPENDING messages. In such cases, the applications and drivers must recover from the loss of the device as best they can.
DBT_DEVICEQUERYREMOVE, DBT_DEVICEREMOVEPENDING, DEV_BROADCAST_HDR, WM_DEVICECHANGE
file: /Techref/os/win/api/win32/mess/src/msg03_24.htm, 1KB, , updated: 2000/4/7 12:19, local time: 2024/9/4 02:14,
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Ashley Roll has put together a really nice little unit here. Leave off the MAX232 and keep these handy for the few times you need true RS232! |
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