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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| No
| Win32s
| No
| Import Library
| kernel32.lib
| Header File
| winbase.h
| Unicode
| No
| Platform Notes
| None
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GetTapePosition
The GetTapePosition function retrieves the current address of the tape, in logical or absolute
blocks.
DWORD GetTapePosition(
HANDLE hDevice,
| // handle of open device
| DWORD dwPositionType,
| // type of address to obtain
| LPDWORD lpdwPartition,
| // address of current tape partition
| LPDWORD lpdwOffsetLow,
| // address of low-order 32 bits of tape position
| LPDWORD lpdwOffsetHigh
| // address of high-order 32 bits of tape position
| );
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Parameters
hDevice
Identifies the device on which to get the tape position. This handle is
created by using CreateFile.
dwPositionType
Specifies the type of address to obtain. This parameter can be one of the
following values:
Value
| Description
| TAPE_ABSOLUTE_POSITION
| The lpdwOffsetLow and lpdwOffsetHigh parameters receive the device-specific block address. The dwPartition parameter receives zero.
| TAPE_LOGICAL_POSITION
| The lpdwOffsetLow and lpdwOffsetHigh parameters receive the logical block address. The dwPartition parameter receives the logical tape partition.
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lpdwPartition
Points 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
Points to a variable that receives the low-order 32 bits of the current tape
position.
lpdwOffsetHigh
Points to a variable that receives the high-order 32 bits of the current tape
position. This parameter can be NULL if the high-order 32 bits are not
required.
Return Values
If the function succeeds, the return value is NO_ERROR.
If the function fails, the return value is one of the following error codes:
Error code
| Description
| ERROR_BEGINNING_OF_MEDIA
| An attempt to access data before the beginning-of-medium marker failed.
| ERROR_BUS_RESET
| A reset condition was detected on the bus.
| ERROR_END_OF_MEDIA
| The end-of-tape marker was reached during an operation.
| ERROR_FILEMARK_DETECTED
| A filemark was reached during an operation.
| ERROR_SETMARK_DETECTED
| A setmark was reached during an operation.
| ERROR_NO_DATA_DETECTED
| The end-of-data marker was reached during an operation.
| ERROR_PARTITION_FAILURE
| The tape could not be partitioned.
| ERROR_INVALID_BLOCK_LENGTH
| The block size is incorrect on a new tape in a multivolume partition.
| ERROR_DEVICE_NOT_PARTITIONED
| The partition information could not be found when a tape was being loaded.
| ERROR_MEDIA_CHANGED
| The tape that was in the drive has been replaced or removed.
| ERROR_NO_MEDIA_IN_DRIVE
| There is no media in the drive.
| ERROR_NOT_SUPPORTED
| The tape driver does not support a requested function.
| ERROR_UNABLE_TO_LOCK_MEDIA
| An attempt to lock the ejection mechanism failed.
| ERROR_UNABLE_TO_UNLOAD_MEDIA
| An attempt to unload the tape failed.
| ERROR_WRITE_PROTECT
| The media is write protected.
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Remarks
A logical block address is relative to a partition. The first logical block
address on each partition is zero.
Call the GetTapeParameters function to obtain information about the status, capabilities, and capacities
of tape drives and media.
See Also
CreateFile, GetTapeParameters, SetTapePosition
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