[wdmaudiodev] SetupDiXxx return wrong facility codes in GetLastError
- From: Eugene Muzychenko <emuzychenko@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Sat, 13 Jan 2007 20:10:34 +0600
Working with SetupAPI for several years, from Win95 to Vista, I
noticed strange error codes periodically returned by SetupDiXxx
functions (GetLastError). These codes have FACILITY_NULL, were unknown
to FormatMessage and I could not find them in winerror.h. I thought
they are a kind of internal codes and didn't investigate them more.
But today I tried to open a non-existent device instance and got an
error code 0xE000020B (523 decimal). Previously I searched winerror.h
only for a decimal definition because FACILITY_NULL codes are defined
in decimal form. But today I tried to search in hex form (20b) and
found SPAPI_E_NO_SUCH_DEVINST (0x800F020B) - an exactly matching
definition. Being passed to FormatMessage, this code produces an
appropriate text description.
Recently, trying to erratically install 32-bit driver under Vista64, I
got error 0xE0000235. Searching the similar way, I found
SPAPI_E_IN_WOW64 (0x800F0235) - one more exact match.
It means that setupapi.dll returns FACILITY_NULL instead of
FACILITY_SETUPAPI within TEN years (from 1995 to 2006).
Does anybody know what is a cause? It cannot be a simple bug otherwise
it might be quickly found and fixed. But searching the Net, I found no
error reports related to this issue.
Finally, what is a proper way to determine such error codes? I can
compare them like that:
DWORD const Err = GetLastError ();
if (
HRESULT_FACILITY (Err) == FACILITY_NULL
&& HRESULT_CODE (Err) == HRESULT_CODE (SPAPI_E_NO_SUCH_DEVINST))
) {
...
}
but such way is very ugly and it will not work if there really is an
error in setupapi.dll and it will be fixed.
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