Lock and Unlock statements (LotusScript Language)
Provide controlled access to files.
Syntax
Lock [#]fileNumber [ , recordNumber | {[ start ] To end } ]
Unlock [#]fileNumber [ , recordNumber | { [ start ] To end } ]
Elements
fileNumber
The number assigned to the file when you opened it.
recordNumber
In a random file, the number of the record that you want to lock or unlock. In a binary file, the byte that you want to lock or unlock. The first record in a random file is record number 1; the first byte in a binary file is byte number 1. LotusScript® locks or unlocks only the specified record or byte.
In a sequential file, LotusScript® locks or unlocks the whole file, regardless of value you specify for recordNumber.
start To **** end
In a random file, the range of record numbers you want to lock or unlock. In a binary file, the range of bytes that you want to lock or unlock. If you omit start, LotusScript® locks records or bytes from the beginning of the file to the specified end position. In a sequential file, LotusScript® locks or unlocks the whole file, regardless of the start and end values.
Usage
In Windows™ 3.1, you must run SHARE.EXE to enable the locking feature if you are using MS-DOS version 3.1 or later. Earlier versions of MS-DOS do not support Lock and Unlock.
Always use Lock and Unlock statements in pairs whose elements-- fileNumber, recordNumber, start, and end -- match exactly. If you do not remove all locks, or if the elements do not match exactly, unpredictable results can occur.