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SetTapePosition function

The SetTapePosition function sets the tape position on the specified device.

Syntax


DWORD SetTapePosition(
  _In_  HANDLE hDevice,
  _In_  DWORD dwPositionMethod,
  _In_  DWORD dwPartition,
  _In_  DWORD dwOffsetLow,
  _In_  DWORD dwOffsetHigh,
  _In_  BOOL bImmediate
);

Parameters

hDevice [in]

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

dwPositionMethod [in]

Type of positioning to perform. This parameter must be one of the following values.

ValueMeaning
TAPE_ABSOLUTE_BLOCK
1L

Moves the tape to the device-specific block address specified by the dwOffsetLow and dwOffsetHigh parameters. The dwPartition parameter is ignored.

TAPE_LOGICAL_BLOCK
2L

Moves the tape to the block address specified by dwOffsetLow and dwOffsetHigh in the partition specified by dwPartition.

TAPE_REWIND
0L

Moves the tape to the beginning of the current partition. The dwPartition, dwOffsetLow, and dwOffsetHigh parameters are ignored.

TAPE_SPACE_END_OF_DATA
4L

Moves the tape to the end of the data on the partition specified by dwPartition.

TAPE_SPACE_FILEMARKS
6L

Moves the tape forward (or backward) the number of filemarks specified by dwOffsetLow and dwOffsetHigh in the current partition. The dwPartition parameter is ignored.

TAPE_SPACE_RELATIVE_BLOCKS
5L

Moves the tape forward (or backward) the number of blocks specified by dwOffsetLow and dwOffsetHigh in the current partition. The dwPartition parameter is ignored.

TAPE_SPACE_SEQUENTIAL_FMKS
7L

Moves the tape forward (or backward) to the first occurrence of n filemarks in the current partition, where n is the number specified by dwOffsetLow and dwOffsetHigh. The dwPartition parameter is ignored.

TAPE_SPACE_SEQUENTIAL_SMKS
9L

Moves the tape forward (or backward) to the first occurrence of n setmarks in the current partition, where n is the number specified by dwOffsetLow and dwOffsetHigh. The dwPartition parameter is ignored.

TAPE_SPACE_SETMARKS
8L

Moves the tape forward (or backward) the number of setmarks specified by dwOffsetLow and dwOffsetHigh in the current partition. The dwPartition parameter is ignored.

 

dwPartition [in]

Partition to position within. If dwPartition is zero, the current partition is used. Partitions are numbered logically from 1 through n, where 1 is the first partition on the tape and n is the last.

dwOffsetLow [in]

Low-order bits of the block address or count for the position operation specified by the dwPositionMethod parameter.

dwOffsetHigh [in]

High-order bits of the block address or count for the position operation specified by the dwPositionMethod parameter. If the high-order bits are not required, this parameter should be zero.

bImmediate [in]

Indicates whether to return as soon as the move operation begins. If this parameter is TRUE, the function returns immediately; if FALSE, the function does not return until the move operation has been completed.

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.

ErrorDescription
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

If the offset specified by dwOffsetLow and dwOffsetHigh specifies the number of blocks, filemarks, or setmarks to move, a positive offset moves the tape forward to the end of the last block, filemark, or setmark. A negative offset moves the tape backward to the beginning of the last block, filemark, or setmark. If the offset is zero, the tape does not move.

To obtain information about the status, capabilities, and capacities of tape drives and media, call the GetTapeParameters function.

Requirements

Minimum supported client

Windows XP [desktop apps only]

Minimum supported server

Windows Server 2003 [desktop apps only]

Header

Winbase.h (include Windows.h)

Library

Kernel32.lib

DLL

Kernel32.dll

See also

CreateFile
GetTapeParameters
GetTapePosition

 

 

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