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version 2003
Is data file locked 
Boolean
| Parameter | Type | Description | ||||
| This command does not require any parameters | ||||||
| Function result | Boolean |  | True = file/segment locked | |||
| False = file/segment not locked | ||||||
Description
The Is data file locked command returns True if the data file of the open database or at least one of its segments is locked — i.e. write protected.
Placed, for instance, in the On Startup Database Method, this command enables the prevention of any risk of accidental opening of a locked data file.
Example
This method will prevent the opening of the database if the data file is locked:
If(Is data file locked)
ALERT("The data file is locked. Impossible to open database.")
QUIT 4D
End if
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