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From: "Jialiang Ge [MSFT]" on 15 Jun 2010 05:32

Hello Timothy

If you were on Windows 7, you can actually try the new trigger start
feature. For example, your service is started only when a USB *storage*
device is inserted. You can find the sample code here:
http://support.microsoft.com/kb/975425/en-us

Regarding 0x42A set by RegisterDeviceNotification, could you please do this
test to confirm that 0x42A was not set by other functions?

SetLastError(0);
hDevNotify = RegisterDeviceNotification(hMainWnd, &NotificationFilter,
DEVICE_NOTIFY_WINDOW_HANDLE);
if (hDevNotify == NULL)
{
printf("%d\n", GetLastError());
}


Regards,
Jialiang Ge
Microsoft Online Community Support

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