Gets the next specified number of blocks of free/busy data in an enumeration.
[in] Number of free/busy data blocks in pblk to retrieve.
[in] Pointer to an array of free/busy blocks. The array is allocated a size of celt. The requested free/busy blocks are returned in this array.
[out] Number of free/busy blocks actually returned in pblk.
The requested number of blocks has been returned.
The requested number of blocks has not been returned.