IOCTL_TAPE_GET_DENSITY

The IOCTL code for IOCTL_TAPE_GET_DENSITY is defined as follows.

#define IOCTL_TAPE_GET_DENSITY \
CTL_CODE(IOCTL_TAPE_BASE, 0x000c, METHOD_BUFFERED, \
	FILE_READ_ACCESS | FILE_WRITE_ACCESS).

The IOCTL reports density for supported devices by using the following structure.

typedef struct _TAPE_DENSITY
{
    UCHAR   ucDensityCode;
    UCHAR   ucDefaultDensity;
    UCHAR   ucPendingDensity;
} TAPE_DENSITY, *PTAPE_DENSITY;

An example of the IOCTL_TAPE_GET_DENSITY command is

TAPE_DENSITY tape_density = {0};

rc = DeviceIoControl(hDevice,
IOCTL_TAPE_GET_DENSITY,
NULL,
0,
&tape_density,
sizeof(TAPE_DENSITY),
&cb,
(LPOVERLAPPED) NULL);