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SPAPI_E_NO_DEFAULT_DEVICE_INTERFACE
Default selection is optional class metadata
SPAPI_E_NO_DEFAULT_DEVICE_INTERFACE means a query specifically requested the default member of a device interface class and no interface has that designation. It does not prove that the class has no present interfaces or that the underlying devices are unavailable.
Applications that can work with any matching interface should enumerate active members instead of treating the absence of a default as fatal. Software that owns the selection policy can designate a default with the dedicated SetupAPI function, but it should not pick one arbitrarily when the class semantics require user or system policy.
Separate enumeration from default selection
- Enumerate the class without the default-only filter to see the available interfaces.
- Check the interface flags and present-device state before opening a path.
- Determine which component is responsible for setting the default for that class.
- Avoid storing a device path as a permanent substitute for the default designation.
References
- Microsoft: device interface class properties
- Microsoft: SetupDiSetDeviceInterfaceDefault
- Microsoft: SetupDiGetClassDevs
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