Re: [PATCH 3/8] setupapi: Implement SetupDiOpenDeviceInfoW().

[Zebediah Figura]

On 3/14/19 11:32 AM, Zhiyi Zhang wrote:
> - /* Check class GUID */
> - size = sizeof(classW);
> - if (RegQueryValueExW(instanceKey, ClassGUID, NULL, NULL, (BYTE *)classW, &size))
> -
>    goto done;
> -
> - classW[37] = 0;
> - UuidFromStringW(&classW[1], &guid);
> -
> - if (!IsEqualGUID(&guid, &set->ClassGuid))
> - {
> -
>    error = ERROR_CLASS_MISMATCH;
> -
>    goto done;
> - }

What if set->ClassGuid is GUID_NULL? I suspect this should match 
SetupDiCreateDeviceInfo().