IOCTL_QUERY_PEW_SIZE

This command is used to query Programmable Early Warning size.

#define IOCTL_QUERY_PEW_SIZE   
   CTL_CODE(IOCTL_TAPE_BASE, 0x082B, METHOD_BUFFERED, FILE_READ_ACCESS )

The structure that is used to query PEW size is

typedef struct _PEW_SIZE{
  USHORT value;
} PEW_SIZE, *PPEW_SIZE;

An example of the IOCTL_QUERY_PEW_SIZE command is

DWORD cb;
PEW_SIZE pew_size;
...
DeviceIoControl(gp->ddHandle0,
IOCTL_QUERY_PEW_SIZE,
NULL,
0,
&pew_size, 
(long)sizeof(PEW_SIZE),
&cb, 
(LPOVERLAPPED) NULL);