If ulLevel is 3 or 4, and pBuf cannot hold the entire PRQINFO3 structure, SplQueryQueue returns NERR_BufTooSmall (2123).

If ulLevel is 6, and pBuf cannot hold the entire PRQINFO6 structure, SplQueryQueue returns NERR_BufTooSmall (2123).

If ulLevel is 4, and pBuf cannot hold all the available PRJINFO2 structures, SplQueryQueue returns ERROR_MORE_DATA (234).

To obtain the size of buffer required, call SplQueryQueue with the required value of ulLevel, cbBuf set to 0 (zero), and a NULL buffer. The number of bytes required is returned in pcbNeeded.