LPCTSTR lpDirectoryName, // pointer to directory name on disk of interest
PULARGE_INTEGER lpFreeBytesAvailableToCaller, // pointer to variable to receive free bytes on disk available to the caller
PULARGE_INTEGER lpTotalNumberOfBytes, // pointer to variable to receive number of bytes on disk
PULARGE_INTEGER lpTotalNumberOfFreeBytes // pointer to variable to receive free bytes on disk
);