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_BtGetPrevious() Function
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_BtGetPrevious() Function
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_BtGetPrevious() Function
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Purpose
Position the Btrieve file on the previous logical record for a given index
Prototype
FUNCTION _BtGetPrevious ( hFile AS PTR, ptrData AS PTR, nRecLen REF WORD, ptrKey AS PTR, nKeyNo AS BYTE ) AS LOGIC PASCAL
Argument(s)
| <hFile> | File handle that was returned by _BtOpen |
| <ptrData> | Pointer to the data structure. |
| <nRecLen> | Length of the data structure. This value must be at least as long as the fixed-length portion of the record. |
| <ptrKey> | Pointer to the Key buffer. Allocate BSIMAX_KEY_SIZE for this buffer |
| <nKeyNo> | Key Number, first key is numbered 0. |
Returns
| LOGIC | Was the move to the previous logical record succesfull. |
Description
If the Get Previous operation is unsuccessful, the MicroKernel may return one of the following status codes:
| 03 | File Not Open |
| 06 | Invalid Key Number |
| 07 | Different Key Number |
| 08 | Invalid Positioning |
| 09 | End of File |
| 22 | Data Buffer Length |
| 82 | Lost Position |
See Also
_BtGetLast(), _BtGetFirst(), _BtGetNext()