GetTapePosition function

The GetTapePosition function retrieves the current address of the tape, in logical or absolute blocks.

Syntax

DWORD GetTapePosition(
  HANDLE  hDevice,
  DWORD   dwPositionType,
  LPDWORD lpdwPartition,
  LPDWORD lpdwOffsetLow,
  LPDWORD lpdwOffsetHigh
);

Parameters

hDevice

Handle to the device on which to get the tape position. This handle is created by using CreateFile.

dwPositionType

Type of address to obtain. This parameter can be one of the following values.

Value Meaning
TAPE_ABSOLUTE_POSITION
0L
The lpdwOffsetLow and lpdwOffsetHigh parameters receive the device-specific block address. The dwPartition parameter receives zero.
TAPE_LOGICAL_POSITION
1L
The lpdwOffsetLow and lpdwOffsetHigh parameters receive the logical block address. The dwPartition parameter receives the logical tape partition.

lpdwPartition

Pointer to a variable that receives the number of the current tape partition. Partitions are numbered logically from 1 through n, where 1 is the first partition on the tape and n is the last. When a device-specific block address is retrieved, or if the device supports only one partition, this parameter receives zero.

lpdwOffsetLow

Pointer to a variable that receives the low-order bits of the current tape position.

lpdwOffsetHigh

Pointer to a variable that receives the high-order bits of the current tape position. This parameter can be NULL if the high-order bits are not required.

Return Value

If the function succeeds, the return value is NO_ERROR.

If the function fails, it can return one of the following error codes.

Error code Description
ERROR_BEGINNING_OF_MEDIA
1102L
An attempt to access data before the beginning-of-medium marker failed.
ERROR_BUS_RESET
1111L
A reset condition was detected on the bus.
ERROR_DEVICE_NOT_PARTITIONED
1107L
The partition information could not be found when a tape was being loaded.
ERROR_END_OF_MEDIA
1100L
The end-of-tape marker was reached during an operation.
ERROR_FILEMARK_DETECTED
1101L
A filemark was reached during an operation.
ERROR_INVALID_BLOCK_LENGTH
1106L
The block size is incorrect on a new tape in a multivolume partition.
ERROR_MEDIA_CHANGED
1110L
The tape that was in the drive has been replaced or removed.
ERROR_NO_DATA_DETECTED
1104L
The end-of-data marker was reached during an operation.
ERROR_NO_MEDIA_IN_DRIVE
1112L
There is no media in the drive.
ERROR_NOT_SUPPORTED
50L
The tape driver does not support a requested function.
ERROR_PARTITION_FAILURE
1105L
The tape could not be partitioned.
ERROR_SETMARK_DETECTED
1103L
A setmark was reached during an operation.
ERROR_UNABLE_TO_LOCK_MEDIA
1108L
An attempt to lock the ejection mechanism failed.
ERROR_UNABLE_TO_UNLOAD_MEDIA
1109L
An attempt to unload the tape failed.
ERROR_WRITE_PROTECT
19L
The media is write protected.

Remarks

A logical block address is relative to a partition. The first logical block address on each partition is zero.

Call the GetTapeParametersfunction to obtain information about the status, capabilities, and capacities of tape drives and media.

Requirements

   
Minimum supported client Windows XP [desktop apps only]
Minimum supported server Windows Server 2003 [desktop apps only]
Target Platform Windows
Header winbase.h (include Windows.h)
Library Kernel32.lib
DLL Kernel32.dll

See Also

CreateFile

GetTapeParameters

SetTapePosition