BOOLEAN
SetupDiClassNameFromGuid(
IN LPGUID ClassGuid,
OUT PTSTR ClassName,
IN DWORD ClassNameSize,
OUT PDWORD RequiredSize /* optional */
);
SetupDiClassNameFromGuid retrieves the class name associated with the class GUID.
The function returns TRUE if it is successful. Otherwise it returns FALSE and the logged error can be retrieved with a call to GetLastError.